subject:(Calcination)

1. Amar, Mouhamadou Al Amine. Traitement des sédiments de dragage pour une valorisation dans les matrices cimentaires : Treatment of dredged sediments for reuse into cementitious matrix.

Degree: Docteur es, Génie civil, 2017, Université Lille I – Sciences et Technologies

URL: http://www.theses.fr/2017LIL10154

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En France, les besoins annuels en matériaux granulaires pour le secteur du BTP sont proches de 400 millions de tonnes dont 96% sont d'origine naturelle.… (more)

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En France, les besoins annuels en matériaux granulaires pour le secteur du BTP sont proches de 400 millions de tonnes dont 96% sont d'origine naturelle. Il est donc inéluctablement nécessaire de trouver des solutions alternatives dites éco-responsables notamment par la valorisation de sous-produits industriels (SPI) tels que les sédiments de dragage. Les sédiments de dragage marins sont désignés comme matière première secondaire dans le cadre de cette étude. Cependant, ces derniers peuvent présenter des niveaux de pollution variables, avec présence de matières organiques (5% à 30%), une teneur en eau relativement élevée (50% à 200%) et une granulométrie assez fine (≤ 300 µm). Ce qui requiert, de mettre en place, en vue d'une utilisation efficiente, des procédés de traitement qui permettront in fine d'améliorer certaines propriétés physico-chimiques du matériau. L'objectif de nos travaux porte sur le traitement physique et thermique des sédiments de dragage puis leur valorisation dans les matrices cimentaires. Nous menons d’abord une étude bibliographique autour de la problématique posée. Au plan expérimental divers études sont conduits : caractérisation physico-chimique, les effets du traitement sur les propriétés des sédiments, l'impact probable de la présence des sédiments dans les matrices cimentaires. Les matériaux cimentaires formulés seront par la suite analysés et caractérisés à quatre échelles: physico-chimique, mécanique, durabilité et environnementale. Une analyse des résultats mécaniques permet de suivre l'activité des sédiments et d'implémenter des lois de formulation adaptées.

In France, construction sector annual needings for granular materials are close to 400 million tonnes, of which 96% are natural origin. Therefore it becames highly necessary to find alternatives solutions, in particular by valorisation of industrial by-products (IBP) such as dredging sediments. Marine sediments are designated as a secondary raw material in this study. However, the latter may present some levels of pollution, with the presence of organic matter (5% to 30%), relatively high water content (50% to 200%) and a fairly fine granulometry (≤ 300 µm). Currently, research target to use them as a supplementary mineral addition in concrete after efficient methods of treatment that improve some physico-chemical properties. The aim of this this study is to establish a profitable methodology for the use of sediments in cementitious matrix. We first lead a bibliographical review on this subject. At the experimental level, a physico-chemical characterization was carried out, determining the major parameters to be considered, the effects of the treatment on material properties, the likely impact of the presence of sediments in the cementitious matrix, and an experimental methodology to quantify these various effects. The cementitious materials formulated will be analysed and characterized at four scales: physico-chemical, mechanical, durability and the environmental impact. An analysis of the mechanical results makes possible to…

Advisors/Committee Members: Benzerzour, Mahfoud (thesis director), Abriak, Nor-Edine (thesis director).

Subjects/Keywords: Calcination; 628.445 8

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APA (6^th Edition):

Amar, M. A. A. (2017). Traitement des sédiments de dragage pour une valorisation dans les matrices cimentaires : Treatment of dredged sediments for reuse into cementitious matrix. (Doctoral Dissertation). Université Lille I – Sciences et Technologies. Retrieved from http://www.theses.fr/2017LIL10154

Chicago Manual of Style (16^th Edition):

Amar, Mouhamadou Al Amine. “Traitement des sédiments de dragage pour une valorisation dans les matrices cimentaires : Treatment of dredged sediments for reuse into cementitious matrix.” 2017. Doctoral Dissertation, Université Lille I – Sciences et Technologies. Accessed April 22, 2021. http://www.theses.fr/2017LIL10154.

MLA Handbook (7^th Edition):

Amar, Mouhamadou Al Amine. “Traitement des sédiments de dragage pour une valorisation dans les matrices cimentaires : Treatment of dredged sediments for reuse into cementitious matrix.” 2017. Web. 22 Apr 2021.

Vancouver:

Amar MAA. Traitement des sédiments de dragage pour une valorisation dans les matrices cimentaires : Treatment of dredged sediments for reuse into cementitious matrix. [Internet] [Doctoral dissertation]. Université Lille I – Sciences et Technologies; 2017. [cited 2021 Apr 22]. Available from: http://www.theses.fr/2017LIL10154.

Council of Science Editors:

Amar MAA. Traitement des sédiments de dragage pour une valorisation dans les matrices cimentaires : Treatment of dredged sediments for reuse into cementitious matrix. [Doctoral Dissertation]. Université Lille I – Sciences et Technologies; 2017. Available from: http://www.theses.fr/2017LIL10154

2. Ellart, Marine. Nouveaux peroxydes d’uranyle et peroxydes mixtes, précurseurs d’oxydes : New uranyl peroxides and mixed peroxides, oxides precursors.

Degree: Docteur es, Molécules et matière condensée, 2016, Université Lille I – Sciences et Technologies

URL: http://www.theses.fr/2016LIL10113

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Afin de miser sur un nucléaire durable les recherches sur les cycles du futur doivent évoluer vers une co-gestion de l’ensemble des actinides et mieux,… (more)

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Afin de miser sur un nucléaire durable les recherches sur les cycles du futur doivent évoluer vers une co-gestion de l’ensemble des actinides et mieux, leur co-conversion. La préparation de solides mixtes intégrant l’uranium et le plutonium est actuellement privilégiée par voie oxalique. Cependant, l’utilisation de peroxydes mixtes comme précurseurs d’oxydes mixtes parait une voie alternative. En effet, la découverte récente de nombreux nano-clusters de peroxydes ou peroxo-oxalates d’uranyle, stabilisés par des cations mono- ou di- ou tri-valents permet d’envisager l’obtention de peroxydes mixtes. Ce travail a pour objectif de former des peroxydes mixtes d’uranium (VI) et de lanthanide (III), utilisé comme analogue des actinides (III), afin d’obtenir, in fine, des oxydes mixtes uranium-lanthanide par traitement thermique. L’examen du système UO22+/NH4+/O22-/C2O42- a permis, non seulement, d’affiner le diagramme d’existence des peroxydes et peroxo-oxalates d’uranyle et d’ammonium en fonction des concentrations des réactifs et du pH mais également d’obtenir douze nouvelles phases cristallines. A partir de pH 9 des phases amorphes précipitent et conduisent, après échange avec le néodyme (III) et calcination, à la formation d’oxydes mixtes homogènes qui intègrent 20 à 30% de néodyme au sein de l’oxyde final. Finalement l’utilisation de cations non labiles thermiquement a permis l’obtention de nouvelles phases U-Ca ou U-Rb.

In order to improve nuclear energy industry sustainability, future research needs to focus on the use of co-management of actinides and their co-conversion. The synthesis of uranium/plutonium mixed oxide by oxalic approach is currently the preferred method. Nevertheless the use of mixed peroxides, like precursors of mixed oxides, is considered as an alternative pathway.In fact, the recent advances on several uranyl peroxides or pero-oxalates nano-clusters stabilized by mono-, di- or tri-valent cations has permitted to investigate the formation of mixed peroxides. This study aims to investigate the formation of mixed uranium (VI) and lanthanide (III) peroxides leading to the formation of uranium-lanthanide mixed oxides, by heat treatment. Lanthanide (III) are used as actinides (III) analogs. The study of the UO22+/NH4+/O22-/C2O42- system allowed us to (i) refine the domains of existence of uranyl and ammonium peroxide and peroxo-oxalates as a function of reactive concentrations or pH (ii) obtain twelve news crystalline phases. At pH 9 and above, amorphous phases precipitated and after neodymium (III) exchange and calcination, led to the formation of mixed oxides. Mixed oxides can thus incorporate from 20 to 30% of neodymium. Finally the use of non thermically labile cations permits the formation of new U-Ca or U-Rb phases.

Advisors/Committee Members: Abraham, Francis (thesis director), Grandjean, Stéphane (thesis director).

Subjects/Keywords: Oxydes d’uranium-Lanthanides; Calcination; 541.38

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APA (6^th Edition):

Ellart, M. (2016). Nouveaux peroxydes d’uranyle et peroxydes mixtes, précurseurs d’oxydes : New uranyl peroxides and mixed peroxides, oxides precursors. (Doctoral Dissertation). Université Lille I – Sciences et Technologies. Retrieved from http://www.theses.fr/2016LIL10113

Chicago Manual of Style (16^th Edition):

Ellart, Marine. “Nouveaux peroxydes d’uranyle et peroxydes mixtes, précurseurs d’oxydes : New uranyl peroxides and mixed peroxides, oxides precursors.” 2016. Doctoral Dissertation, Université Lille I – Sciences et Technologies. Accessed April 22, 2021. http://www.theses.fr/2016LIL10113.

MLA Handbook (7^th Edition):

Ellart, Marine. “Nouveaux peroxydes d’uranyle et peroxydes mixtes, précurseurs d’oxydes : New uranyl peroxides and mixed peroxides, oxides precursors.” 2016. Web. 22 Apr 2021.

Vancouver:

Ellart M. Nouveaux peroxydes d’uranyle et peroxydes mixtes, précurseurs d’oxydes : New uranyl peroxides and mixed peroxides, oxides precursors. [Internet] [Doctoral dissertation]. Université Lille I – Sciences et Technologies; 2016. [cited 2021 Apr 22]. Available from: http://www.theses.fr/2016LIL10113.

Council of Science Editors:

Ellart M. Nouveaux peroxydes d’uranyle et peroxydes mixtes, précurseurs d’oxydes : New uranyl peroxides and mixed peroxides, oxides precursors. [Doctoral Dissertation]. Université Lille I – Sciences et Technologies; 2016. Available from: http://www.theses.fr/2016LIL10113

University of Adelaide

3. Craig, Richard Alexander. Investigating the use of concentrated solar energy to thermally decompose limestone.

Degree: 2010, University of Adelaide

URL: http://hdl.handle.net/2440/65560

► The objectives of this research investigation are to answer fundamental questions regarding the effectiveness of using concentrated solar energy as the sole heating source for… (more)

▼ The objectives of this research investigation are to answer fundamental questions regarding the effectiveness of using concentrated solar energy as the sole heating source for the thermo-chemical decomposition of limestone-marble, supplied by Penrice, Angaston. Specifically, scientific analyses are used to investigate the energy requirements for the efficient manufacture of quicklime using solar thermal energy. To achieve these aims, the energy requirements for an industrial scale solar lime manufacturing system were first evaluated. The main conclusion from this analysis is that the thermal efficiency of a solar energy supplied lime manufacture system compares favourably with the best fossil fuelled system. A good heat recovery system as well as a comprehensive preheating system is recommended to minimise the energy losses from the system. A zero dimensional model was then used to determine that the most energy efficient shape for a travelling grate solar furnace is a triangular cross section. This shape maximise the exposure of the limestone to the radiant energy while minimising structural heat losses. This analytical evaluation also identified that the open area of entrance and exit openings, which allow the process materials to flow through the kiln and for the exhaust gases to escape the kiln, should be minimised. Thirty three times more heat flux is lost through these openings than through the kiln structure. Minimising the openings area therefore improves kiln thermal efficiency. This investigation then evaluated the maximum bed thickness for the limestone when using a grate bed system within the proposed solar furnace. Due to the nature of radiation it is recommended that the limestone layer be no thicker than 2.5 times the nominal diameter of the limestone in use. This thickness optimises the exposure of the stone to the direct radiation and increases the heat transfer to the stones lower within the bed and allows for the unrestricted diffusion of CO2 away from these stones. The investigation then experimentally quantified the effects of radiant heat flux intensity on the calcination kinetics of the Penrice, Angaston marble as a function of stone size. This experimental investigation involved comparing results from an electric muffle furnace, an atmospherically open solar radiation furnace, and an enclosed triangular shaped solar radiation furnace. The muffle furnace provided a baseline values to which the solar calcination rates could be compared. The open system solar calcination experiments showed that the preheating time of the stone is directly proportional to the illuminated surface area of the stone and the intensity of the heat flux to which it is exposed. Additionally, the reaction rate is directly proportional to the radiant heat flux, and is independent of the stone size for heat fluxes greater than 430kW/m2. The enclosed solar furnace experiments identified a 45% improvement in decomposition time could be achieved by using the triangular shaped solar furnace compared to the open solar system… Advisors/Committee Members: Nathan, Graham (advisor), Mullinger, Peter (advisor), School of Chemical Engineering (school), School of Mechanical Engineering (school).

Subjects/Keywords: solar energy; minerals processing; solar lime; solar; limestone; lime solar calcination; CO2 mitigation; calcination

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APA (6^th Edition):

Craig, R. A. (2010). Investigating the use of concentrated solar energy to thermally decompose limestone. (Thesis). University of Adelaide. Retrieved from http://hdl.handle.net/2440/65560

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

Chicago Manual of Style (16^th Edition):

Craig, Richard Alexander. “Investigating the use of concentrated solar energy to thermally decompose limestone.” 2010. Thesis, University of Adelaide. Accessed April 22, 2021. http://hdl.handle.net/2440/65560.

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

MLA Handbook (7^th Edition):

Craig, Richard Alexander. “Investigating the use of concentrated solar energy to thermally decompose limestone.” 2010. Web. 22 Apr 2021.

Vancouver:

Craig RA. Investigating the use of concentrated solar energy to thermally decompose limestone. [Internet] [Thesis]. University of Adelaide; 2010. [cited 2021 Apr 22]. Available from: http://hdl.handle.net/2440/65560.

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

Council of Science Editors:

Craig RA. Investigating the use of concentrated solar energy to thermally decompose limestone. [Thesis]. University of Adelaide; 2010. Available from: http://hdl.handle.net/2440/65560

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

4. Said Mansour, Mohamed. Influence du métakaolin sur le comportement rhéologique et mécanique des bétons à hautes performances : Influence of metakaolin on the rheological and mechanical behavior of high perfomance concretes.

Degree: Docteur es, Génie civil, 2010, Cergy-Pontoise; Université Saad Dahlab de Blida (Algérie)

URL: http://www.theses.fr/2010CERG0496

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L'utilisation du kaolin calciné, sous forme de métakaolin, comme matériau pouzzolanique pour le mortier et le béton a suscité une attention considérable ces dernières années.… (more)

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L'utilisation du kaolin calciné, sous forme de métakaolin, comme matériau pouzzolanique pour le mortier et le béton a suscité une attention considérable ces dernières années. Le travail actuel décrit les résultats d'un projet de recherche lancé pour étudier la calcination d'un kaolin local sous diverses températures (650-950°C) et durées (2, 3 et 4 heures) qui ont produit le métakaolin avec une activité pouzzolanique élevée. L'activité pouzzolanique a été évaluée par des méthodes de la chaleur d'hydratation et la résistance à la compression à 28 jours. L'activité maximale a été obtenue à une température de 850°C pendant 3 heures. Les résultats observés établissent qu'une augmentation de la chaleur d'hydratation et de la résistance à la compression a été obtenue lorsque le ciment Portland Ordinaire a été remplacé par 10% de métakaolin. L'utilisation du ciment ternaire améliore la résistance au jeune âge et à long terme. La durabilité a été également améliorée où une meilleure résistance des mortiers à l'attaque des acides a été observée.

The utilisation of calcined clay, in the form of metakaolin as a pozzolanic material for mortar and concrete has received considerable attention in recent years. The present work describes the results of a research project initiated to study the calcination of a local kaolin at various temperatures (650-950°C) and durations (2, 3 and 4 hours) to produced a metakaolin with a high pozzolanic activity. The pozzolanic activity was assessed by 28-days compressive strength and hydration heat methods. The maximum identified activity was obtained at 850°C for 3 hours duration. The observed results establish that an increase of both hydration heat and compressive strength was obtained when ordinary Portland cement was replaced by 10% metakaolin. The use of ternary blended cement improves the early age and the long-term compressive strength. The durability was also enhanced as better acidic resistance was observed.

Advisors/Committee Members: Khadri, El hadj (thesis director), Kenaï, Saïd (thesis director).

Subjects/Keywords: Kaolin; Calcination; Metakaolin; Chaleur d'hydratation; Hautes performances; Durabilité; Kaolin; Calcination; Metakaolin; Heat of hydration; High performance; Durability

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APA (6^th Edition):

Said Mansour, M. (2010). Influence du métakaolin sur le comportement rhéologique et mécanique des bétons à hautes performances : Influence of metakaolin on the rheological and mechanical behavior of high perfomance concretes. (Doctoral Dissertation). Cergy-Pontoise; Université Saad Dahlab de Blida (Algérie). Retrieved from http://www.theses.fr/2010CERG0496

Chicago Manual of Style (16^th Edition):

Said Mansour, Mohamed. “Influence du métakaolin sur le comportement rhéologique et mécanique des bétons à hautes performances : Influence of metakaolin on the rheological and mechanical behavior of high perfomance concretes.” 2010. Doctoral Dissertation, Cergy-Pontoise; Université Saad Dahlab de Blida (Algérie). Accessed April 22, 2021. http://www.theses.fr/2010CERG0496.

MLA Handbook (7^th Edition):

Said Mansour, Mohamed. “Influence du métakaolin sur le comportement rhéologique et mécanique des bétons à hautes performances : Influence of metakaolin on the rheological and mechanical behavior of high perfomance concretes.” 2010. Web. 22 Apr 2021.

Vancouver:

Said Mansour M. Influence du métakaolin sur le comportement rhéologique et mécanique des bétons à hautes performances : Influence of metakaolin on the rheological and mechanical behavior of high perfomance concretes. [Internet] [Doctoral dissertation]. Cergy-Pontoise; Université Saad Dahlab de Blida (Algérie); 2010. [cited 2021 Apr 22]. Available from: http://www.theses.fr/2010CERG0496.

Council of Science Editors:

Said Mansour M. Influence du métakaolin sur le comportement rhéologique et mécanique des bétons à hautes performances : Influence of metakaolin on the rheological and mechanical behavior of high perfomance concretes. [Doctoral Dissertation]. Cergy-Pontoise; Université Saad Dahlab de Blida (Algérie); 2010. Available from: http://www.theses.fr/2010CERG0496

University of New South Wales

5. Silberstein, Bernard. The fluidised bed calcination of gypsum.

Degree: Chemical Engineering, Faculty of Applied Science, 1963, University of New South Wales

URL: http://handle.unsw.edu.au/1959.4/58151 ; https://unsworks.unsw.edu.au/fapi/datastream/unsworks:45476/SOURCE01?view=true

Subjects/Keywords: calcination; Gypsum; Fluidised bed calcination; Thesis Digitisation Program

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APA (6^th Edition):

Silberstein, B. (1963). The fluidised bed calcination of gypsum. (Masters Thesis). University of New South Wales. Retrieved from http://handle.unsw.edu.au/1959.4/58151 ; https://unsworks.unsw.edu.au/fapi/datastream/unsworks:45476/SOURCE01?view=true

Chicago Manual of Style (16^th Edition):

Silberstein, Bernard. “The fluidised bed calcination of gypsum.” 1963. Masters Thesis, University of New South Wales. Accessed April 22, 2021. http://handle.unsw.edu.au/1959.4/58151 ; https://unsworks.unsw.edu.au/fapi/datastream/unsworks:45476/SOURCE01?view=true.

MLA Handbook (7^th Edition):

Silberstein, Bernard. “The fluidised bed calcination of gypsum.” 1963. Web. 22 Apr 2021.

Vancouver:

Silberstein B. The fluidised bed calcination of gypsum. [Internet] [Masters thesis]. University of New South Wales; 1963. [cited 2021 Apr 22]. Available from: http://handle.unsw.edu.au/1959.4/58151 ; https://unsworks.unsw.edu.au/fapi/datastream/unsworks:45476/SOURCE01?view=true.

Council of Science Editors:

Silberstein B. The fluidised bed calcination of gypsum. [Masters Thesis]. University of New South Wales; 1963. Available from: http://handle.unsw.edu.au/1959.4/58151 ; https://unsworks.unsw.edu.au/fapi/datastream/unsworks:45476/SOURCE01?view=true

Anna University

6. Krishna Chandar N. Investigations on the synthesis and characterization of some rare earth oxide nanostructures and mesocrystals;.

Degree: 2014, Anna University

URL: http://shodhganga.inflibnet.ac.in/handle/10603/15478

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Rare-earth (RE) oxides have been widely used in high-performance luminescent, magnetic, catalytic, and other functional devices due to their unique electronic, optical and chemical characteristics… (more)

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Rare-earth (RE) oxides have been widely used in high-performance luminescent, magnetic, catalytic, and other functional devices due to their unique electronic, optical and chemical characteristics arising from 4f electrons. Mesocrystals have received rapidly increasing attention since they were first proposed as a new class of ordered nanoparticle superstructures by Cölfen. Mesocrystals not only possess the properties of nanoparticles in microscale, but also exhibit unique characteristics or improved properties. Investigations have been carried out on the growth kinetics and morphological evolution of CeO2 nanoparticles synthesized by mixed solvothermal route. The as-dried sample was subjected to calcination at 400°C, 500°C and 600°C for 2h and the effect of calcination temperature on the growth kinetics and morphology of the nanoparticles was studied. X-ray diffraction (XRD) studies showed that the calcinated samples exhibit phase pure cubic fluorite structure, which was further confirmed by Raman studies. The possible formation mechanism has been discussed based on the experimental results. PL analyses demonstrate that the RE ions (Ce3+, Sm3+ and Gd3+) uniformly substitute Dy3+ sites in Dy2O3 lattice and hence influence the optical properties. C14TAB assisted CeO2 and Pr6O11 mesocrystals were synthesized via wet-chemical route and their self-assembly mechanism has been investigated. XRD, SEM, AFM, HRTEM, EDS, FTIR, Raman, UV-Vis and PL spectroscopy were employed to characterize the crystal phase, morphology, chemical composition and optical properties of CeO2 and Pr6O11 mesocrystals. The experimental results showed that the product possesses mesocrystal structure with self-assembly architecture in the presence of C14TAB as template. A possible formation mechanism of CeO2 and Pr6O11 mesocrystals is proposed on account of aggregation of nanoparticles along with the epitaxial orientation. The prepared samples exhibit a very strong near band edge emission with weak defect emissions. newline

Advisors/Committee Members: Jayavel R.

Subjects/Keywords: Rare earth oxides; mesocrystals; nanoparticles; Raman studies; X-ray diffraction; calcination

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APA (6^th Edition):

N, K. C. (2014). Investigations on the synthesis and characterization of some rare earth oxide nanostructures and mesocrystals;. (Thesis). Anna University. Retrieved from http://shodhganga.inflibnet.ac.in/handle/10603/15478

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

Chicago Manual of Style (16^th Edition):

N, Krishna Chandar. “Investigations on the synthesis and characterization of some rare earth oxide nanostructures and mesocrystals;.” 2014. Thesis, Anna University. Accessed April 22, 2021. http://shodhganga.inflibnet.ac.in/handle/10603/15478.

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

MLA Handbook (7^th Edition):

N, Krishna Chandar. “Investigations on the synthesis and characterization of some rare earth oxide nanostructures and mesocrystals;.” 2014. Web. 22 Apr 2021.

Vancouver:

N KC. Investigations on the synthesis and characterization of some rare earth oxide nanostructures and mesocrystals;. [Internet] [Thesis]. Anna University; 2014. [cited 2021 Apr 22]. Available from: http://shodhganga.inflibnet.ac.in/handle/10603/15478.

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

Council of Science Editors:

N KC. Investigations on the synthesis and characterization of some rare earth oxide nanostructures and mesocrystals;. [Thesis]. Anna University; 2014. Available from: http://shodhganga.inflibnet.ac.in/handle/10603/15478

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

NSYSU

7. Liu, Shih-wei. Effects of Capping Agent and Calcination on Morphology of Tungsten Oxide Nanostructures for Ethanol Gas Sensing Applications.

Degree: Master, Electrical Engineering, 2018, NSYSU

URL: http://etd.lib.nsysu.edu.tw/ETD-db/ETD-search/view_etd?URN=etd-0628118-220403

► In this thesis, we discuss various nanostructures of tungsten oxide (WO3) and roughen the surface of nanomaterials with calcination for ethanol gas sensing applications. Firstly,… (more)

Subjects/Keywords: ethanol gas sensor; tungsten oxide; hydrothermal synthesis; capping agent; calcination

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APA (6^th Edition):

Liu, S. (2018). Effects of Capping Agent and Calcination on Morphology of Tungsten Oxide Nanostructures for Ethanol Gas Sensing Applications. (Thesis). NSYSU. Retrieved from http://etd.lib.nsysu.edu.tw/ETD-db/ETD-search/view_etd?URN=etd-0628118-220403

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

Chicago Manual of Style (16^th Edition):

Liu, Shih-wei. “Effects of Capping Agent and Calcination on Morphology of Tungsten Oxide Nanostructures for Ethanol Gas Sensing Applications.” 2018. Thesis, NSYSU. Accessed April 22, 2021. http://etd.lib.nsysu.edu.tw/ETD-db/ETD-search/view_etd?URN=etd-0628118-220403.

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

MLA Handbook (7^th Edition):

Liu, Shih-wei. “Effects of Capping Agent and Calcination on Morphology of Tungsten Oxide Nanostructures for Ethanol Gas Sensing Applications.” 2018. Web. 22 Apr 2021.

Vancouver:

Liu S. Effects of Capping Agent and Calcination on Morphology of Tungsten Oxide Nanostructures for Ethanol Gas Sensing Applications. [Internet] [Thesis]. NSYSU; 2018. [cited 2021 Apr 22]. Available from: http://etd.lib.nsysu.edu.tw/ETD-db/ETD-search/view_etd?URN=etd-0628118-220403.

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

Council of Science Editors:

Liu S. Effects of Capping Agent and Calcination on Morphology of Tungsten Oxide Nanostructures for Ethanol Gas Sensing Applications. [Thesis]. NSYSU; 2018. Available from: http://etd.lib.nsysu.edu.tw/ETD-db/ETD-search/view_etd?URN=etd-0628118-220403

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

University of Cambridge

8. Dai, Peng. Modelling non-catalytic gas-solid reactions.

Degree: PhD, 2018, University of Cambridge

URL: https://doi.org/10.17863/CAM.18224 ; https://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.744479

► The overall objective of the work described in this Dissertation was to develop and verify a general reaction and diffusion model for non-catalytic reactions between… (more)

▼ The overall objective of the work described in this Dissertation was to develop and verify a general reaction and diffusion model for non-catalytic reactions between gases and porous solids, particularly those relevant to the clean use of fossil fuels. Here, the internal pore structure of the solid was characterised by observing the kinetics in a regime limited only by intrinsic chemical reaction. It was hypothesised that a simple arbitrary function, f(X), determined from experimental measurements of rate vs. conversion in a kinetically-controlled regime, could be used in place of formal, mathematical pore models, to describe the evolution of pore structure during a reaction influenced by intraparticle mass transfer. The approach was used to study (i) the gasification of chars by CO2, where the only product was gaseous, (ii) the calcination of CaCO3 cycled between calcined and carbonated states, where the products were a gas and a solid, and (iii) the sulphation of virgin and sintered CaO by SO2, the only product being solid. Studies of calcination showed that, at least for limestones subjected to a history of cycling between the calcined and carbonated states, a correctly-determined f(X) could be applied to different sizes of particles at temperatures different to that at which f(X) was determined. Somewhat surprisingly, it was found that the f(X) determined from one, cycled, limestone was successful in predicting the conversion of other cycled limestones of different geological origin. It was concluded that the process of cycling between the calcined and carbonated states at the same process condition had significantly reduced the differences apparent in the pore structures of the different limestones when first calcined from the virgin materials. The experimentally-observed effects of pressure, concentration of CO2 and temperature described in the literature were explained successfully by the mathematical model. Finally, the study of sulphation explained satisfactorily (i) the reason for there being a maximum in the ultimate conversion of CaO to CaSO4 at a specific temperature, and (ii) the processes controlling the overall uptake of SO2 by sintered CaO, such as might be produced from a calcium-looping cycle for capturing CO2 from flue gases. For both the virgin and the cycled calcines, the ultimate conversion to CaSO4 seemed to be limited by the pore volume below 300 nm diameter. Two mechanisms were identified to explain why CaO cannot be fully sulphated to CaSO4. In summary, this work has demonstrated the applicability of the general reaction and diffusion model to gasification, calcination and sulphation reactions, and verified the f(X) approach for describing pore evolution during reaction.

Subjects/Keywords: 541; Modelling; Gas-Solid Reaction; Gasification Reaction; Calcination Reaction; Sulphation Reaction

Record Details Similar Records Cite « Share

❌

APA · Chicago · MLA · Vancouver · CSE | Export to Zotero / EndNote / Reference Manager

APA (6^th Edition):

Dai, P. (2018). Modelling non-catalytic gas-solid reactions. (Doctoral Dissertation). University of Cambridge. Retrieved from https://doi.org/10.17863/CAM.18224 ; https://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.744479

Chicago Manual of Style (16^th Edition):

Dai, Peng. “Modelling non-catalytic gas-solid reactions.” 2018. Doctoral Dissertation, University of Cambridge. Accessed April 22, 2021. https://doi.org/10.17863/CAM.18224 ; https://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.744479.

MLA Handbook (7^th Edition):

Dai, Peng. “Modelling non-catalytic gas-solid reactions.” 2018. Web. 22 Apr 2021.

Vancouver:

Dai P. Modelling non-catalytic gas-solid reactions. [Internet] [Doctoral dissertation]. University of Cambridge; 2018. [cited 2021 Apr 22]. Available from: https://doi.org/10.17863/CAM.18224 ; https://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.744479.

Council of Science Editors:

Dai P. Modelling non-catalytic gas-solid reactions. [Doctoral Dissertation]. University of Cambridge; 2018. Available from: https://doi.org/10.17863/CAM.18224 ; https://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.744479

Univerzitet u Beogradu

9. Markovski, Jasmina S. 1985-. Uklanjanje arsena primenom prirodnog i solvotermalno sintetisanog kalcita modifikovanog oksidima metala.

Degree: Tehnološko-metalurški fakultet, 2016, Univerzitet u Beogradu

URL: https://fedorabg.bg.ac.rs/fedora/get/o:12523/bdef:Content/get

►

Tehničko-tehnološke nauke - Inženjerstvo zaštite životne sredine / Applied sciences - Environmental Engineering

Predmet istraživanja ove doktorske teze bio je pronalazak novih materijala, optimalnih adsorpcionih… (more)

▼

Tehničko-tehnološke nauke - Inženjerstvo zaštite životne sredine / Applied sciences - Environmental Engineering

Predmet istraživanja ove doktorske teze bio je pronalazak novih materijala, optimalnih adsorpcionih svojstava, sa mogućnošću praktične primene za efikasno uklanjanje As(V)-jona iz vodenog rastvora. U okviru rada razmatran je uticaj sinteze i metoda modifikacije na svojstva krajnjeg proizvoda, tj. adsorbenta, u zavisnosti od njegovih adsorptivnih svojstava i primene. Postupak sinteze adsorpcionih materijala bio je dvostepen. U prvom stupnju sinteze izvršena je priprema visokoporoznih osnova, tj. solvotermalno sintetisanog kalcita i kalcinisane ljuske kokošjeg jajeta, koje su dalje, u drugom stupnju, modifikovane gvožđe(III)-oksihidroksidom u obliku goetita, mangan(IV)-oksidom u formi α-MnO2 i hibridnim sistemom goetit/α-MnO2. Dobijeni materijali su skraćeno nazvani: solvotermalno sintetisan kalcit‒materijal A, kalcinisana ljuska jajeta‒materijal B, solvotermalno sintetisan kalcit/goetit‒materijal C, kalcinisana ljuska jajeta/goetit‒materijal D, solvotermalno sintetisan kalcit/α-MnO2‒materijal E, kalcinisana ljuska jajeta/α-MnO2‒materijal F, solvotermalno sintetisan kalcit/goetit/α-MnO2‒materijal G, kalcinisana ljuska jajeta/goetit/α-MnO2‒materijal H. Karakterizacija dobijenih materijala je izvršena primenom rendgenske difrakcione analize, skenirajuće elektronske mikroskopije, infracrvene spektrometrije sa Furijeovom transformacijom i metodom adsorpciono-desorpcione izoterme. Ispitivan je uticaj ultrazvučnog procesa i magnetnog mešanja na adsorpcionu efikasnost procesa. Rezultati su pokazali značajno unapređenje adsorpcionog procesa u slučaju primene ultrazvuka u odnosu na konvencionalno magnetno mešanje. Adsorpciona efikasnost ovako dobijenih materijala je ispitivana u zavisnosti od metoda funkcionalizacije, pH vrednosti rastvora, vremenskog intervala procesa, temperature, koncentracije adsorbata i uticaja...

Advisors/Committee Members: Marinković, Aleksandar, 1970-.

Subjects/Keywords: Arsenic; adsorption; ultrasound; calcit; solvothermal synthesis; calcination; modification; goethite; α-MnO2

Record Details Similar Records Cite « Share

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APA · Chicago · MLA · Vancouver · CSE | Export to Zotero / EndNote / Reference Manager

APA (6^th Edition):

Markovski, J. S. 1. (2016). Uklanjanje arsena primenom prirodnog i solvotermalno sintetisanog kalcita modifikovanog oksidima metala. (Thesis). Univerzitet u Beogradu. Retrieved from https://fedorabg.bg.ac.rs/fedora/get/o:12523/bdef:Content/get

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

Chicago Manual of Style (16^th Edition):

Markovski, Jasmina S 1985-. “Uklanjanje arsena primenom prirodnog i solvotermalno sintetisanog kalcita modifikovanog oksidima metala.” 2016. Thesis, Univerzitet u Beogradu. Accessed April 22, 2021. https://fedorabg.bg.ac.rs/fedora/get/o:12523/bdef:Content/get.

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

MLA Handbook (7^th Edition):

Markovski, Jasmina S 1985-. “Uklanjanje arsena primenom prirodnog i solvotermalno sintetisanog kalcita modifikovanog oksidima metala.” 2016. Web. 22 Apr 2021.

Vancouver:

Markovski JS1. Uklanjanje arsena primenom prirodnog i solvotermalno sintetisanog kalcita modifikovanog oksidima metala. [Internet] [Thesis]. Univerzitet u Beogradu; 2016. [cited 2021 Apr 22]. Available from: https://fedorabg.bg.ac.rs/fedora/get/o:12523/bdef:Content/get.

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

Council of Science Editors:

Markovski JS1. Uklanjanje arsena primenom prirodnog i solvotermalno sintetisanog kalcita modifikovanog oksidima metala. [Thesis]. Univerzitet u Beogradu; 2016. Available from: https://fedorabg.bg.ac.rs/fedora/get/o:12523/bdef:Content/get

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

University of Cambridge

10. Hao, Rui. Investigation into the Production of Carbonates and Oxides from Synthetic Brine through Carbon Sequestration.

Degree: PhD, 2017, University of Cambridge

URL: https://www.repository.cam.ac.uk/handle/1810/267931

► The cement industry contributes around 5-7% of man-made CO2 emissions globally because of the Portland Cement (PC) production. Therefore, innovative reactive magnesia cement, with significant… (more)

▼ The cement industry contributes around 5-7% of man-made CO2 emissions globally because of the Portland Cement (PC) production. Therefore, innovative reactive magnesia cement, with significant sustainable and technical advantages, has been proposed by blending reactive MgO and hydraulic binders in various proportions. MgO is currently produced from the calcination of magnesite (MgCO3), emitting more CO2 than the production of PC, or from seawater/brine which is also extremely energy intensive. Hence this research aims to investigate an innovative method to produce MgO from reject brine, a waste Mg source, through carbon sequestration, by its reaction with CO2, to provide a comparable low carbon manufacturing process due to the recycling of CO2. The produced deposits are then calcined to oxides with potential usage in construction industry. The entire system is a closed loop to achieve both environmental optimisation and good productivity. This research focuses on the chemical manufacturing process, integrated with material science knowledge and advancements, instead of concentrating purely on chemistry evaluations. Six series of studies were conducted, utilising MgCl2, CaCl2, MgCl2-CaCl2, MgCl2-CaCl2-NaCl, and MgCl2-CaCl2-NaCl-KCl to react with CO2 under alkaline conditions. The precipitates include hydrated magnesium carbonates, calcium carbonates and magnesian calcite. Generated carbonates were then calcined in a furnace to obtain MgO, CaO or dolime (CaO•MgO). All six series of carbonation processes were carried out under a controlled pH level, to study the constant pH’s effect on the process and resulting precipitates. Other controllable factors include pH, temperature, initial concentration, stirring speed, and CO2 flux rate. In conclusion, the optimum parameters for the production of the carbonated precipitates are: 0.25MgCl2 + 0.05CaCl2 + 2.35NaCl + 0.05KCl, 700rpm stirring speed, 25 °C room temperature, pH=10.5, and 500cm3/min CO2 infusion rate. Reaction time is within a day. These parameters are chosen based on the sequestration level, particle performance morphology and the operational convenience. The optimum calcination parameters are at 800 °C heating temperature with a 4h retention time.

Subjects/Keywords: Carbon Mineralisation; Synthetic Brine; Magnesia Cement; Carbonation and Calcination

Record Details Similar Records Cite « Share

❌

APA · Chicago · MLA · Vancouver · CSE | Export to Zotero / EndNote / Reference Manager

APA (6^th Edition):

Hao, R. (2017). Investigation into the Production of Carbonates and Oxides from Synthetic Brine through Carbon Sequestration. (Doctoral Dissertation). University of Cambridge. Retrieved from https://www.repository.cam.ac.uk/handle/1810/267931

Chicago Manual of Style (16^th Edition):

Hao, Rui. “Investigation into the Production of Carbonates and Oxides from Synthetic Brine through Carbon Sequestration.” 2017. Doctoral Dissertation, University of Cambridge. Accessed April 22, 2021. https://www.repository.cam.ac.uk/handle/1810/267931.

MLA Handbook (7^th Edition):

Hao, Rui. “Investigation into the Production of Carbonates and Oxides from Synthetic Brine through Carbon Sequestration.” 2017. Web. 22 Apr 2021.

Vancouver:

Hao R. Investigation into the Production of Carbonates and Oxides from Synthetic Brine through Carbon Sequestration. [Internet] [Doctoral dissertation]. University of Cambridge; 2017. [cited 2021 Apr 22]. Available from: https://www.repository.cam.ac.uk/handle/1810/267931.

Council of Science Editors:

Hao R. Investigation into the Production of Carbonates and Oxides from Synthetic Brine through Carbon Sequestration. [Doctoral Dissertation]. University of Cambridge; 2017. Available from: https://www.repository.cam.ac.uk/handle/1810/267931

University of Cambridge

11. Dai, Peng. Modelling Non-Catalytic Gas-Solid Reactions.

Degree: PhD, 2018, University of Cambridge

URL: https://www.repository.cam.ac.uk/handle/1810/271240

► The overall objective of the work described in this Dissertation was to develop and verify a general reaction and diffusion model for non-catalytic reactions between… (more)

▼ The overall objective of the work described in this Dissertation was to develop and verify a general reaction and diffusion model for non-catalytic reactions between gases and porous solids, particularly those relevant to the clean use of fossil fuels. Here, the internal pore structure of the solid was characterised by observing the kinetics in a regime limited only by intrinsic chemical reaction. It was hypothesised that a simple arbitrary function, f(X), determined from experimental measurements of rate vs. conversion in a kinetically-controlled regime, could be used in place of formal, mathematical pore models, to describe the evolution of pore structure during a reaction influenced by intraparticle mass transfer. The approach was used to study (i) the gasification of chars by CO2, where the only product was gaseous, (ii) the calcination of CaCO3 cycled between calcined and carbonated states, where the products were a gas and a solid, and (iii) the sulphation of virgin and sintered CaO by SO2, the only product being solid. Studies of calcination showed that, at least for limestones subjected to a history of cycling between the calcined and carbonated states, a correctly-determined f(X) could be applied to different sizes of particles at temperatures different to that at which f(X) was determined. Somewhat surprisingly, it was found that the f(X) determined from one, cycled, limestone was successful in predicting the conversion of other cycled limestones of different geological origin. It was concluded that the process of cycling between the calcined and carbonated states at the same process condition had significantly reduced the differences apparent in the pore structures of the different limestones when first calcined from the virgin materials. The experimentally-observed effects of pressure, concentration of CO2 and temperature described in the literature were explained successfully by the mathematical model. Finally, the study of sulphation explained satisfactorily (i) the reason for there being a maximum in the ultimate conversion of CaO to CaSO4 at a specific temperature, and (ii) the processes controlling the overall uptake of SO2 by sintered CaO, such as might be produced from a calcium-looping cycle for capturing CO2 from flue gases. For both the virgin and the cycled calcines, the ultimate conversion to CaSO4 seemed to be limited by the pore volume below 300 nm diameter. Two mechanisms were identified to explain why CaO cannot be fully sulphated to CaSO4. In summary, this work has demonstrated the applicability of the general reaction and diffusion model to gasification, calcination and sulphation reactions, and verified the f(X) approach for describing pore evolution during reaction.

Subjects/Keywords: Modelling; Gas-Solid Reaction; Gasification Reaction; Calcination Reaction; Sulphation Reaction

Record Details Similar Records Cite « Share

❌

APA · Chicago · MLA · Vancouver · CSE | Export to Zotero / EndNote / Reference Manager

APA (6^th Edition):

Dai, P. (2018). Modelling Non-Catalytic Gas-Solid Reactions. (Doctoral Dissertation). University of Cambridge. Retrieved from https://www.repository.cam.ac.uk/handle/1810/271240

Chicago Manual of Style (16^th Edition):

Dai, Peng. “Modelling Non-Catalytic Gas-Solid Reactions.” 2018. Doctoral Dissertation, University of Cambridge. Accessed April 22, 2021. https://www.repository.cam.ac.uk/handle/1810/271240.

MLA Handbook (7^th Edition):

Dai, Peng. “Modelling Non-Catalytic Gas-Solid Reactions.” 2018. Web. 22 Apr 2021.

Vancouver:

Dai P. Modelling Non-Catalytic Gas-Solid Reactions. [Internet] [Doctoral dissertation]. University of Cambridge; 2018. [cited 2021 Apr 22]. Available from: https://www.repository.cam.ac.uk/handle/1810/271240.

Council of Science Editors:

Dai P. Modelling Non-Catalytic Gas-Solid Reactions. [Doctoral Dissertation]. University of Cambridge; 2018. Available from: https://www.repository.cam.ac.uk/handle/1810/271240

12. Neira, Alexander Fernández. Caracterización y determinación del proceso para la producción de cal comercial a partir de la piedra caliza.

Degree: 2013, Instituto Politécnico do Porto

URL: http://www.rcaap.pt/detail.jsp?id=oai:recipp.ipp.pt:10400.22/7584

►

La cal es un material producido a partir de la calcinación de la roca caliza y tiene diversas utilidades en el mundo de la industria… (more)

▼

La cal es un material producido a partir de la calcinación de la roca caliza y tiene diversas utilidades en el mundo de la industria como la siderúrgica, papelera, alimentaria, en la construcción, entre otras. Es fundamental conocer todas las características de la caliza para poder determinar su grado de calcinación. Con el presente trabajo se pretende estudiar las propriedades de la caliza para su posterior calcinación y el dimensionamento de una planta de producción de cal desde que el mineral llega de la explotación hasta que sale al mercado.Para determinar los equipos se calularon sus dimensiones para una producción de 600 t/h de cal, sabiendo que la planta principal de machaquero solo trabajará 5 días de la semana en jornadas de 8 horas, mientras que a partir del horno de calcinación estará en funcionamento los 7 dias de la semana, 24 horas al día. A partir de esas consideraciones se obtienen las dimensiones de todos los equipos y se realiza un estudio para la elección de un horno, o un horno de eje vertical y un horno rotativo, así como el combustible empleado, ya que es una parte fundamental para determinar los costes para la producción de cal.Tmbién fue objeto de este trabajo, el estudio ambiental de la instalación de la planta, en función de la mezcla de combustible empleada y del impacto en el entorno de la lisma, así como un estudio de viabilidad de la planta, estimando unos costes de la misma y un precio de mercado "ex Works".

Lime is a material produced from the calcination of limestones and has several applications in the industrial world, mainly the industries of steel, paper, food and construction. It is essential to know all the characteristics of the limestones in order to determine the degree of calcination. With the present work is intended to study the properties of limestone for the subsequent calcination and the sizing of a lime production plant since the mineral comes from the mining operation until it hits the market. The processing equipments were calculated for a production of 600 t/h of lime, with the kowledge that the crushing main plant only works five days per week in sessions of 8 hours, while the calcination kiln runs 7 days per week in sessions of 24 hours. With these considerations it was possible to obtain the correct size of all the equipments and the election of a suitable furnace, between the shaft kiln and the rotary kiln, as well as the proper fuel, because it's a crucial part to evaluate the costs of the lime production. The environmental study for the plant was also a subject of thie work, based on the usued fuel and the environmental impact, as well as a viability study of the plant estimating the costs and a "ex works" market price.

Advisors/Committee Members: Fernandes, José Augusto.

Subjects/Keywords: Cal; Caliza; Calcinación; Horno; Lime; Limestone; Calcination; Kiln

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❌

APA · Chicago · MLA · Vancouver · CSE | Export to Zotero / EndNote / Reference Manager

APA (6^th Edition):

Neira, A. F. (2013). Caracterización y determinación del proceso para la producción de cal comercial a partir de la piedra caliza. (Thesis). Instituto Politécnico do Porto. Retrieved from http://www.rcaap.pt/detail.jsp?id=oai:recipp.ipp.pt:10400.22/7584

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

Chicago Manual of Style (16^th Edition):

Neira, Alexander Fernández. “Caracterización y determinación del proceso para la producción de cal comercial a partir de la piedra caliza.” 2013. Thesis, Instituto Politécnico do Porto. Accessed April 22, 2021. http://www.rcaap.pt/detail.jsp?id=oai:recipp.ipp.pt:10400.22/7584.

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

MLA Handbook (7^th Edition):

Neira, Alexander Fernández. “Caracterización y determinación del proceso para la producción de cal comercial a partir de la piedra caliza.” 2013. Web. 22 Apr 2021.

Vancouver:

Neira AF. Caracterización y determinación del proceso para la producción de cal comercial a partir de la piedra caliza. [Internet] [Thesis]. Instituto Politécnico do Porto; 2013. [cited 2021 Apr 22]. Available from: http://www.rcaap.pt/detail.jsp?id=oai:recipp.ipp.pt:10400.22/7584.

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

Council of Science Editors:

Neira AF. Caracterización y determinación del proceso para la producción de cal comercial a partir de la piedra caliza. [Thesis]. Instituto Politécnico do Porto; 2013. Available from: http://www.rcaap.pt/detail.jsp?id=oai:recipp.ipp.pt:10400.22/7584

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

Durham University

13. Ruddick, Victoria Jane. Plasma versus thermal activation of the Phillips catalyst.

Degree: PhD, 1996, Durham University

URL: http://etheses.dur.ac.uk/5346/ ; http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.365407

► Silica supported chromium oxide catalysts, known as Phillips catalysts, are used in the production of over 40% of the world's high-density polyethylene. The original catalyst… (more)

▼ Silica supported chromium oxide catalysts, known as Phillips catalysts, are used in the production of over 40% of the world's high-density polyethylene. The original catalyst comprised CrO(_3) impregnated onto silica. Due to the carcinogenic nature of chromium(VI), chromium(m) catalyst precursors which are oxidised during calcination are now preferred. Two such precursors have been employed throughout the studies reported in this thesis; one is prepared by the aqueous impregnation of a silica support with basic chromium(in) acetate, whilst the other comprises a dry-blended mixture of chromium(m) acetylacetonate with silica. Calcination of the two precursors has been studied using a combination of temperature-programmed quadrupole mass spectrometry and infrared spectroscopy. The chromium(III) acetylacetonate precursor is postulated to disperse near its melting point and react via an acetate intermediate. Both precursors may therefore be expected to produce the same catalyst following calcination. The study of subsequent CO reduction of these calcined catalysts by quadrupole mass spectrometry supports this observation. The reduction is found to proceed via a Langmuir-Hinshelwood mechanism, both precursors demonstrating the same behaviour. Activation energies for the catalyst reduction have been determined from the corresponding Arrhenius plots. Quadrupole mass spectrometry techniques have identified 1-hexene production during the early stages of polymerization using the CO reduced catalysts. This indicates the formation of a chromacyclopentane intermediate species which may also be involved in the mitiation of polymerization. The continuous fragmentation of the catalyst support and polymer growth have been investigated using contact mode and phase-imaging atomic force microscopy. Non-equilibrium plasma oxidation of the two catalyst precursors has been studied by quadrupole mass spectrometry. An active catalyst is obtained from the chromium(m) acetate catalyst, however the dry-blended chromium(in) acetylacetonate precursor is unable to achieve the dispersion required, and the oxidised species are inactive for ethylene polymerization.

Subjects/Keywords: 541; Polyethylene; Calcination; Precursors

Record Details Similar Records Cite « Share

❌

APA · Chicago · MLA · Vancouver · CSE | Export to Zotero / EndNote / Reference Manager

APA (6^th Edition):

Ruddick, V. J. (1996). Plasma versus thermal activation of the Phillips catalyst. (Doctoral Dissertation). Durham University. Retrieved from http://etheses.dur.ac.uk/5346/ ; http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.365407

Chicago Manual of Style (16^th Edition):

Ruddick, Victoria Jane. “Plasma versus thermal activation of the Phillips catalyst.” 1996. Doctoral Dissertation, Durham University. Accessed April 22, 2021. http://etheses.dur.ac.uk/5346/ ; http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.365407.

MLA Handbook (7^th Edition):

Ruddick, Victoria Jane. “Plasma versus thermal activation of the Phillips catalyst.” 1996. Web. 22 Apr 2021.

Vancouver:

Ruddick VJ. Plasma versus thermal activation of the Phillips catalyst. [Internet] [Doctoral dissertation]. Durham University; 1996. [cited 2021 Apr 22]. Available from: http://etheses.dur.ac.uk/5346/ ; http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.365407.

Council of Science Editors:

Ruddick VJ. Plasma versus thermal activation of the Phillips catalyst. [Doctoral Dissertation]. Durham University; 1996. Available from: http://etheses.dur.ac.uk/5346/ ; http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.365407

University of Cambridge

14. Hao, Rui. Investigation into the production of carbonates and oxides from synthetic brine through carbon sequestration.

Degree: PhD, 2017, University of Cambridge

URL: https://doi.org/10.17863/CAM.13862 ; https://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.725603

► The cement industry contributes around 5-7% of man-made CO2 emissions globally because of the Portland Cement (PC) production. Therefore, innovative reactive magnesia cement, with significant… (more)

▼ The cement industry contributes around 5-7% of man-made CO2 emissions globally because of the Portland Cement (PC) production. Therefore, innovative reactive magnesia cement, with significant sustainable and technical advantages, has been proposed by blending reactive MgO and hydraulic binders in various proportions. MgO is currently produced from the calcination of magnesite (MgCO3), emitting more CO2 than the production of PC, or from seawater/brine which is also extremely energy intensive. Hence this research aims to investigate an innovative method to produce MgO from reject brine, a waste Mg source, through carbon sequestration, by its reaction with CO2, to provide a comparable low carbon manufacturing process due to the recycling of CO2. The produced deposits are then calcined to oxides with potential usage in construction industry. The entire system is a closed loop to achieve both environmental optimisation and good productivity. This research focuses on the chemical manufacturing process, integrated with material science knowledge and advancements, instead of concentrating purely on chemistry evaluations. Six series of studies were conducted, utilising MgCl2, CaCl2, MgCl2-CaCl2, MgCl2-CaCl2-NaCl, and MgCl2-CaCl2-NaCl-KCl to react with CO2 under alkaline conditions. The precipitates include hydrated magnesium carbonates, calcium carbonates and magnesian calcite. Generated carbonates were then calcined in a furnace to obtain MgO, CaO or dolime (CaO•MgO). All six series of carbonation processes were carried out under a controlled pH level, to study the constant pH’s effect on the process and resulting precipitates. Other controllable factors include pH, temperature, initial concentration, stirring speed, and CO2 flux rate. In conclusion, the optimum parameters for the production of the carbonated precipitates are: 0.25MgCl2 + 0.05CaCl2 + 2.35NaCl + 0.05KCl, 700rpm stirring speed, 25 °C room temperature, pH=10.5, and 500cm3/min CO2 infusion rate. Reaction time is within a day. These parameters are chosen based on the sequestration level, particle performance morphology and the operational convenience. The optimum calcination parameters are at 800 °C heating temperature with a 4h retention time.

Subjects/Keywords: 624.1; Carbon Mineralisation; Synthetic Brine; Magnesia Cement; Carbonation and Calcination

Record Details Similar Records Cite « Share

❌

APA · Chicago · MLA · Vancouver · CSE | Export to Zotero / EndNote / Reference Manager

APA (6^th Edition):

Hao, R. (2017). Investigation into the production of carbonates and oxides from synthetic brine through carbon sequestration. (Doctoral Dissertation). University of Cambridge. Retrieved from https://doi.org/10.17863/CAM.13862 ; https://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.725603

Chicago Manual of Style (16^th Edition):

Hao, Rui. “Investigation into the production of carbonates and oxides from synthetic brine through carbon sequestration.” 2017. Doctoral Dissertation, University of Cambridge. Accessed April 22, 2021. https://doi.org/10.17863/CAM.13862 ; https://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.725603.

MLA Handbook (7^th Edition):

Hao, Rui. “Investigation into the production of carbonates and oxides from synthetic brine through carbon sequestration.” 2017. Web. 22 Apr 2021.

Vancouver:

Hao R. Investigation into the production of carbonates and oxides from synthetic brine through carbon sequestration. [Internet] [Doctoral dissertation]. University of Cambridge; 2017. [cited 2021 Apr 22]. Available from: https://doi.org/10.17863/CAM.13862 ; https://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.725603.

Council of Science Editors:

Hao R. Investigation into the production of carbonates and oxides from synthetic brine through carbon sequestration. [Doctoral Dissertation]. University of Cambridge; 2017. Available from: https://doi.org/10.17863/CAM.13862 ; https://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.725603

University of Sydney

15. Fei, Jingyuan. Thermal – Control Synthesis of Manganese Oxides and Their Oxidation Property .

Degree: 2016, University of Sydney

URL: http://hdl.handle.net/2123/15990

► Liquid phase oxidation of benzyl alcohol is an important reaction for providing benzaldehyde and benzoic acid, as both products are largely required in perfumery and… (more)

Subjects/Keywords: manganese oxides; thermal - control; calcination; aerobic oxidation; benzyl alcohol

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APA (6^th Edition):

Fei, J. (2016). Thermal – Control Synthesis of Manganese Oxides and Their Oxidation Property . (Thesis). University of Sydney. Retrieved from http://hdl.handle.net/2123/15990

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

Chicago Manual of Style (16^th Edition):

Fei, Jingyuan. “Thermal – Control Synthesis of Manganese Oxides and Their Oxidation Property .” 2016. Thesis, University of Sydney. Accessed April 22, 2021. http://hdl.handle.net/2123/15990.

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

MLA Handbook (7^th Edition):

Fei, Jingyuan. “Thermal – Control Synthesis of Manganese Oxides and Their Oxidation Property .” 2016. Web. 22 Apr 2021.

Vancouver:

Fei J. Thermal – Control Synthesis of Manganese Oxides and Their Oxidation Property . [Internet] [Thesis]. University of Sydney; 2016. [cited 2021 Apr 22]. Available from: http://hdl.handle.net/2123/15990.

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

Council of Science Editors:

Fei J. Thermal – Control Synthesis of Manganese Oxides and Their Oxidation Property . [Thesis]. University of Sydney; 2016. Available from: http://hdl.handle.net/2123/15990

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

Brno University of Technology

16. Tišnovský, Michal. Hydratace oxidu hořečnatého v polopáleném dolomitu: Hydration Process of Magnesium Oxide from Partly Calcined Dolomite.

Degree: 2020, Brno University of Technology

URL: http://hdl.handle.net/11012/195131

► This bachelor thesis deals with the study of half-burnt dolomite, it‘s thermal decomposition (calcination) and preparation of a mixture of magnesium hydroxide and calcium carbonate… (more)

Subjects/Keywords: Polopálený dolomit; kalcinace; hydratace; srážení; Half-burned dolomite; calcination; hydration; precipitation

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APA (6^th Edition):

Tišnovský, M. (2020). Hydratace oxidu hořečnatého v polopáleném dolomitu: Hydration Process of Magnesium Oxide from Partly Calcined Dolomite. (Thesis). Brno University of Technology. Retrieved from http://hdl.handle.net/11012/195131

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

Chicago Manual of Style (16^th Edition):

Tišnovský, Michal. “Hydratace oxidu hořečnatého v polopáleném dolomitu: Hydration Process of Magnesium Oxide from Partly Calcined Dolomite.” 2020. Thesis, Brno University of Technology. Accessed April 22, 2021. http://hdl.handle.net/11012/195131.

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

MLA Handbook (7^th Edition):

Tišnovský, Michal. “Hydratace oxidu hořečnatého v polopáleném dolomitu: Hydration Process of Magnesium Oxide from Partly Calcined Dolomite.” 2020. Web. 22 Apr 2021.

Vancouver:

Tišnovský M. Hydratace oxidu hořečnatého v polopáleném dolomitu: Hydration Process of Magnesium Oxide from Partly Calcined Dolomite. [Internet] [Thesis]. Brno University of Technology; 2020. [cited 2021 Apr 22]. Available from: http://hdl.handle.net/11012/195131.

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

Council of Science Editors:

Tišnovský M. Hydratace oxidu hořečnatého v polopáleném dolomitu: Hydration Process of Magnesium Oxide from Partly Calcined Dolomite. [Thesis]. Brno University of Technology; 2020. Available from: http://hdl.handle.net/11012/195131

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

University of Missouri – Columbia

17. Chang, Huibin. Synthesis and application of calcium phosphate fibers/whiskers.

Degree: 2013, University of Missouri – Columbia

URL: http://hdl.handle.net/10355/38589

► [ACCESS RESTRICTED TO THE UNIVERSITY OF MISSOURI AT AUTHOR'S REQUEST.] Calcium phosphate is the main inorganic constituent of human hard tissues such as bone and… (more)

Subjects/Keywords: hydroxyapatite whiskers; homogeneous precipitation; molten salt synthesis; two-step calcination

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APA (6^th Edition):

Chang, H. (2013). Synthesis and application of calcium phosphate fibers/whiskers. (Thesis). University of Missouri – Columbia. Retrieved from http://hdl.handle.net/10355/38589

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

Chicago Manual of Style (16^th Edition):

Chang, Huibin. “Synthesis and application of calcium phosphate fibers/whiskers.” 2013. Thesis, University of Missouri – Columbia. Accessed April 22, 2021. http://hdl.handle.net/10355/38589.

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

MLA Handbook (7^th Edition):

Chang, Huibin. “Synthesis and application of calcium phosphate fibers/whiskers.” 2013. Web. 22 Apr 2021.

Vancouver:

Chang H. Synthesis and application of calcium phosphate fibers/whiskers. [Internet] [Thesis]. University of Missouri – Columbia; 2013. [cited 2021 Apr 22]. Available from: http://hdl.handle.net/10355/38589.

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

Council of Science Editors:

Chang H. Synthesis and application of calcium phosphate fibers/whiskers. [Thesis]. University of Missouri – Columbia; 2013. Available from: http://hdl.handle.net/10355/38589

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

RMIT University

18. Thompson, N. An approach to the synthesis of strontium aluminate based nanophosphors.

Degree: 2013, RMIT University

URL: http://researchbank.rmit.edu.au/view/rmit:160439

► This work describes a study of the synthesis and photoluminescent properties of strontium aluminate nano-phosphors co-doped with the lanthanide ions, Eu2+ and Dy3+, and the… (more)

▼ This work describes a study of the synthesis and photoluminescent properties of strontium aluminate nano-phosphors co-doped with the lanthanide ions, Eu2+ and Dy3+, and the transition metal, Cr3+, prepared via a microemulsion synthesis followed by calcination. Chapter one presents an overview of persistent luminescence phosphors, as well as the role lanthanides play in such phosphors, followed by an in-depth analysis of the mechanisms of persistent luminescence. The second half of the chapter presents a brief review of current synthetic methodologies for producing persistent luminescent phosphors, and concludes with a discussion of the advantages of the microemulsion synthetic technique especially control over particle size and the uniform distribution of the dopant concentration. Chapter two describes the materials, apparatus and methodology utilized for the synthesis and analysis of the strontium aluminate nano-phosphors. The chapter focuses on the microemulsion methodology which was employed throughout this work, and the calcination procedures employed, in particular, the development of the two stage oxidative pre-calcination procedure. Chapter three focuses on the synthesis of a blue emitting Sr4Al14O25nanophosphor doped with Eu2+ and Dy3+. This material was prepared utilizing, for the first time the microemulsion technique and two calcination routes were investigated, (i) a single stage calcination procedure, and (ii) a two stage calcination procedure, which employed oxidative pre-calcination at 1100Â°C for the first time. The single stage calcination required large concentrations of boric acid flux to produce optimal persistence afterglow characteristics, and also gave rise to impurities, such as glassy BO3 phases and carbon deposition, on the surface of the phosphor. For the two stage calcination procedure, oxidative pre-calcination was employed, removing the impurities identified, as well as lowering the concentration of boric acid required to achieve the optimal persistence afterglow. Significantly, oxidative pre-calcination enhanced the desirable characteristics of the phosphor, with deep trap states (I3) and the time constant of long lasting afterglow (Ï„3) increasing by approximately 60% and 50% respectively. Efficient charge transfer mechanisms brought about by the homogeneous distribution of dopant ions as a result of the microemulsion route was observed, with significant decreases in both dopant ion concentration, and concentration quenching compared to those previously reported. The fourth chapter reports the synthesis of a green emitting SrAl2O4doped with Eu2+ and Dy3+prepared via the microemulsion technique and utilizing the oxidative pre-calcination route developed in Chapter 3. Persistence afterglow spectra revealed increased quantities of deep trap states comparable with those of the blue emitting phosphors, as well as efficient charge transfer, and reductions in concentration and concentration quenching as was found for the blue phosphors, with increases in I3 and Ï„3 of 50% and 60%…

Subjects/Keywords: Fields of Research; Microemulsion; synthesis; phosphors; photoluminescence; lanthanides; Strontium; Aluminates; oxidative; calcination; reductive calcination; dopants; long persistence; afterglow; nanoparticles; XRD; analysis; SEM; TEM; EDX; fluorescence

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APA (6^th Edition):

Thompson, N. (2013). An approach to the synthesis of strontium aluminate based nanophosphors. (Thesis). RMIT University. Retrieved from http://researchbank.rmit.edu.au/view/rmit:160439

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

Chicago Manual of Style (16^th Edition):

Thompson, N. “An approach to the synthesis of strontium aluminate based nanophosphors.” 2013. Thesis, RMIT University. Accessed April 22, 2021. http://researchbank.rmit.edu.au/view/rmit:160439.

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

MLA Handbook (7^th Edition):

Thompson, N. “An approach to the synthesis of strontium aluminate based nanophosphors.” 2013. Web. 22 Apr 2021.

Vancouver:

Thompson N. An approach to the synthesis of strontium aluminate based nanophosphors. [Internet] [Thesis]. RMIT University; 2013. [cited 2021 Apr 22]. Available from: http://researchbank.rmit.edu.au/view/rmit:160439.

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

Council of Science Editors:

Thompson N. An approach to the synthesis of strontium aluminate based nanophosphors. [Thesis]. RMIT University; 2013. Available from: http://researchbank.rmit.edu.au/view/rmit:160439

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

Universiteit Utrecht

19. Sietsma, J.R.A. Ordered mesoporous materials as model supports to study catalyst preparation.

Degree: 2007, Universiteit Utrecht

URL: http://dspace.library.uu.nl:8080/handle/1874/22965

► Catalysts are indispensable to modern-day society because of their prominent role in petroleum refining, chemical processing, and the reduction of environmental pollution. The catalytically active… (more)

▼ Catalysts are indispensable to modern-day society because of their prominent role in petroleum refining, chemical processing, and the reduction of environmental pollution. The catalytically active component often consists of small metal (oxide) particles that are supported on a carrier such as silica or alumina. These particles are generally introduced via impregnation of the support with a precursor-containing solution followed by drying. Subsequent thermal treatment in air converts the precursor into the desired metal oxide, or metal when followed by high-temperature reduction with hydrogen. The choice of precursor and the experimental conditions applied during the preparation largely affect the final dispersion of the active phase. This thesis describes the use of ordered mesoporous materials as model supports, in particular SBA-15. It is demonstrated that by combining ordered mesoporous supports with (3D)-TEM and bulk characterisation techniques such as XRD and Nitrogen physisiorption fundamental insight can be obtained into the effects of the individual steps in preparation on the final dispersion of the metal (oxide) particles and the implications thereof for catalysis. The research focussed on Ni and Co ex nitrate catalysts as these are amongst the most widely applied metals and their preparation using nitrate precursors is attractive, but generally disappointing as poor metal dispersions are obtained. The outcome of a comprehensive study carried out to identify the reasons for this are described and it is demonstrated that the poor dispersions are caused by severe sintering and redistribution during the air calcination step used to convert the nitrate precursor into the respective oxide. The factors that play an important role are discussed and a novel method is presented that comprises of decomposition in NO/He atmosphere, which allows preparation of supported nickel oxide and cobalt oxide particles of 3 to 5 nm at loadings of 24 to 37 wt% and 16 to 23 wt%, respectively. The validity of this method for different systems is demonstrated and an explanation for the role of NO is proposed. Moreover, the relevance of this new method for catalysis is proven using the hydrogenation of Soybean oil and the Fischer-Tropsch synthesis of syngas into hydrocarbons over silica supported Ni and Co catalysts, respectively. It is shown that the activity of the NO/He treated catalysts is superior compared to the catalysts treated with air calcination. Finally, the results of our study on the use of ordered mesoporous materials as host for homogeneous PCP and SCS-pincer Pd catalysts are presented. It is demonstrated that the complexes were successfully tethered to the support via a trialkoxysilane moiety without destruction of the ordered mesoporous support. The activity of the SBA-15 modified with PCP-pincer Pd-complex as Lewis acid in the aldol condensation between methyl isocyanoacetate and benzaldehyde is discussed together with recycling results that show the true heterogeneous nature of the catalyst in this reaction.

Subjects/Keywords: Scheikunde; catalyst preparation; SBA-15; model support; nickel; cobalt; nitrates; calcination; nitric oxide; impregnation; drying

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APA · Chicago · MLA · Vancouver · CSE | Export to Zotero / EndNote / Reference Manager

APA (6^th Edition):

Sietsma, J. R. A. (2007). Ordered mesoporous materials as model supports to study catalyst preparation. (Doctoral Dissertation). Universiteit Utrecht. Retrieved from http://dspace.library.uu.nl:8080/handle/1874/22965

Chicago Manual of Style (16^th Edition):

Sietsma, J R A. “Ordered mesoporous materials as model supports to study catalyst preparation.” 2007. Doctoral Dissertation, Universiteit Utrecht. Accessed April 22, 2021. http://dspace.library.uu.nl:8080/handle/1874/22965.

MLA Handbook (7^th Edition):

Sietsma, J R A. “Ordered mesoporous materials as model supports to study catalyst preparation.” 2007. Web. 22 Apr 2021.

Vancouver:

Sietsma JRA. Ordered mesoporous materials as model supports to study catalyst preparation. [Internet] [Doctoral dissertation]. Universiteit Utrecht; 2007. [cited 2021 Apr 22]. Available from: http://dspace.library.uu.nl:8080/handle/1874/22965.

Council of Science Editors:

Sietsma JRA. Ordered mesoporous materials as model supports to study catalyst preparation. [Doctoral Dissertation]. Universiteit Utrecht; 2007. Available from: http://dspace.library.uu.nl:8080/handle/1874/22965

Penn State University

20. Yang, Xiaojing. Sulfation Behavior of Calcium-based Sorbents under Oxy-combustion Conditions at High Pressures.

Degree: 2015, Penn State University

URL: https://submit-etda.libraries.psu.edu/catalog/27429

► Oxy-combustion, combustion in oxygen without nitrogen, has already been used to reduce fuel consumption and emissions to advance clean coal combustion technologies for electrical power… (more)

▼ Oxy-combustion, combustion in oxygen without nitrogen, has already been used to reduce fuel consumption and emissions to advance clean coal combustion technologies for electrical power generation. The same system can also use limestone and dolomite to capture SO2. Therefore, fluidized-bed oxy-combustion at high pressures is now being explored to produce and sequester a pure stream of CO2 as flue gas in an attempt to design zero-emission power plants. Sulfation of limestones typically occurs in two stages—calcination and then sulfation. Previous studies have shown that when the partial pressure of CO2 in a system is higher than the equilibrium pressure, direct sulfation of limestones without the calcination step occurs. However, the mechanism for this process is not clear. In oxy-pressurized fluidized-bed combustion (PFBC), the effects of CO2/O2 ratio (CO2 partial pressure), sorbent petrography, and MgCO3 are not well documented and need to be understood in order to properly design a PFBC combustor. The primary objective of this study was to compare the sulfation degrees of three different sorbents at pressurized and atmospheric conditions and to elucidate the mechanism for higher sulfation degrees under direct sulfation. The effect of CO2/O2 ratio on sulfation was also investigated. Sulfation tests on two limestones (Graymont and Michigan) and one dolomite (Ohio) were conducted in a fixed-bed reactor at 870 °C at higher pressure (8 bar) and at atmospheric pressure under typical oxy-combustion conditions. The reactor was equipped with a continuous gas analyser to monitor CO2, SO2, and O2. The decomposition study of the sorbents was carried out using hot-stage X-Ray Diffraction (XRD) for in-situ observation, simulating the phase changes during the heating process of each sorbent in the reactor. Further, a fixed-bed reactor was designed to use higher amounts of sample than a typical thermogravimetric analysis (TGA) so that subsequent analyses could be performed on the samples to understand the mechanism. Typically, a TGA uses 5-20 mg of sample. In this fixed-bed reactor, however, approximately one gram of sample was spread in a boat to reduce mass transfer effects. The degree of sulfation of the sulfated samples was determined using XRD technique, and the grain sizes of crystallites were also determined by XRD analysis. The cross-sections of the sulfated sorbents were then observed under a scanning electron microscope (SEM), and elemental maps were taken by coupling energy dispersive spectroscopy (EDS). The effects of petrographic characteristics, sulfation pattern, CO2 partial pressure, and total pressure were then analysed and correlated. Hot-Stage XRD analysis conducted at atmospheric pressure showed that under a pure CO2 environment, CaCO3 did not decompose between 200 and 900 °C, whereas CaMg(CO3)2 started to decompose to CaCO3, MgO, and MgCO3 at 650 °C. The sulfation results showed that the conversion increased with an increasing CO2/O2 ratio at any given pressure, and a higher conversion was observed at high… Advisors/Committee Members: Sarma V Pisupati, Thesis Advisor/Co-Advisor.

Subjects/Keywords: sulfation; limestone; dolomite; oxy-combustion; fluidized-bed; pressurized-systems; sulfation; calcination; SEM; petrographic

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APA (6^th Edition):

Yang, X. (2015). Sulfation Behavior of Calcium-based Sorbents under Oxy-combustion Conditions at High Pressures. (Thesis). Penn State University. Retrieved from https://submit-etda.libraries.psu.edu/catalog/27429

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

Chicago Manual of Style (16^th Edition):

Yang, Xiaojing. “Sulfation Behavior of Calcium-based Sorbents under Oxy-combustion Conditions at High Pressures.” 2015. Thesis, Penn State University. Accessed April 22, 2021. https://submit-etda.libraries.psu.edu/catalog/27429.

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

MLA Handbook (7^th Edition):

Yang, Xiaojing. “Sulfation Behavior of Calcium-based Sorbents under Oxy-combustion Conditions at High Pressures.” 2015. Web. 22 Apr 2021.

Vancouver:

Yang X. Sulfation Behavior of Calcium-based Sorbents under Oxy-combustion Conditions at High Pressures. [Internet] [Thesis]. Penn State University; 2015. [cited 2021 Apr 22]. Available from: https://submit-etda.libraries.psu.edu/catalog/27429.

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

Council of Science Editors:

Yang X. Sulfation Behavior of Calcium-based Sorbents under Oxy-combustion Conditions at High Pressures. [Thesis]. Penn State University; 2015. Available from: https://submit-etda.libraries.psu.edu/catalog/27429

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

Western Kentucky University

21. Javangula, Harika. Comparative Studies On Standard and Fire-Rated Gypsum Wallboards.

Degree: MS, Department of Chemistry, 2014, Western Kentucky University

URL: https://digitalcommons.wku.edu/theses/1331

► The long term goal of this research is to improve the fire resistance of gypsum wallboard (GWB). Gypsum wallboard consists mainly of gypsum, i.e.… (more)

▼ The long term goal of this research is to improve the fire resistance of gypsum wallboard (GWB). Gypsum wallboard consists mainly of gypsum, i.e. calcium sulfate dihydrate, CaSO₄•2H₂O. In buildings, the chemical, mechanical and thermal properties of gypsum wallboard play an important role in delaying the spread of fire. To build a fire resistant GWB, it is very important to study the thermal, mechanical, physical and chemical properties of regular GWB and various types of fire-resistant wallboards available commercially in the market. Various fire-resistant GWBs have been compared and contrasted with reference to a standard wallboard in this study. Regardless of the type of wallboard, the main component is gypsum. The fire resistance property is mainly attributed to the absorption of energy related with the loss of hydrate water going from the dihydrate (CaSO₄•2H₂O) form to the hemihydrate (CaSO₄•½H₂O) and from the hemihydrate to the anhydrous form (CaSO₄) in a second dehydration. The present paper is a comparative study of commercially available standard, fire-rated Type X and firerated Type C gypsum wallboards. Type X wallboards are typically reinforced with noncombustible fibers so as to protect the integrity of the wallboard during thermal shrinkage, while the Type C wallboards are incorporated with more glass fibers and an additive, usually a form of vermiculite. These Type C wallboards have a shrinkage adjusting element that expands when exposed to elevated temperature. Differential scanning calorimetry (DSC), thermogravimetric analysis (TGA), thermomechanical analysis (TMA), scanning electron microscopy (SEM) and powder X-ray diffraction (XRD) were used to characterize and compare the materials. Various properties, such as the heat flow, weight loss, dimensional changes, morphology and crystalline structures of the gypsum wallboards were studied using these techniques. Advisors/Committee Members: Quentin Lineberry (Director), Stuart Burris, Kevin Wiiliams.

Subjects/Keywords: Thermal Shrinkage; Derivative Mass Loss; Dehydration; Calcination; Analytical Chemistry; Chemistry; Inorganic Chemistry

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APA (6^th Edition):

Javangula, H. (2014). Comparative Studies On Standard and Fire-Rated Gypsum Wallboards. (Masters Thesis). Western Kentucky University. Retrieved from https://digitalcommons.wku.edu/theses/1331

Chicago Manual of Style (16^th Edition):

Javangula, Harika. “Comparative Studies On Standard and Fire-Rated Gypsum Wallboards.” 2014. Masters Thesis, Western Kentucky University. Accessed April 22, 2021. https://digitalcommons.wku.edu/theses/1331.

MLA Handbook (7^th Edition):

Javangula, Harika. “Comparative Studies On Standard and Fire-Rated Gypsum Wallboards.” 2014. Web. 22 Apr 2021.

Vancouver:

Javangula H. Comparative Studies On Standard and Fire-Rated Gypsum Wallboards. [Internet] [Masters thesis]. Western Kentucky University; 2014. [cited 2021 Apr 22]. Available from: https://digitalcommons.wku.edu/theses/1331.

Council of Science Editors:

Javangula H. Comparative Studies On Standard and Fire-Rated Gypsum Wallboards. [Masters Thesis]. Western Kentucky University; 2014. Available from: https://digitalcommons.wku.edu/theses/1331

University of Manitoba

22. McCorquodale-Bauer, Kenton. Use of zebra mussel shells as an alternative mineral resource for lime production as a phosphorus precipitant.

Degree: Biosystems Engineering, 2019, University of Manitoba

URL: http://hdl.handle.net/1993/34194

► Zebra mussels are an invasive species to North America and are presently found in many rivers and lakes in prolific numbers. Along with many other… (more)

Subjects/Keywords: Zebra mussel shells; Phosphorus removal; Calcium carbonate; Calcination; Calcium oxide; Zebra mussel shell reuse

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APA (6^th Edition):

McCorquodale-Bauer, K. (2019). Use of zebra mussel shells as an alternative mineral resource for lime production as a phosphorus precipitant. (Masters Thesis). University of Manitoba. Retrieved from http://hdl.handle.net/1993/34194

Chicago Manual of Style (16^th Edition):

McCorquodale-Bauer, Kenton. “Use of zebra mussel shells as an alternative mineral resource for lime production as a phosphorus precipitant.” 2019. Masters Thesis, University of Manitoba. Accessed April 22, 2021. http://hdl.handle.net/1993/34194.

MLA Handbook (7^th Edition):

McCorquodale-Bauer, Kenton. “Use of zebra mussel shells as an alternative mineral resource for lime production as a phosphorus precipitant.” 2019. Web. 22 Apr 2021.

Vancouver:

McCorquodale-Bauer K. Use of zebra mussel shells as an alternative mineral resource for lime production as a phosphorus precipitant. [Internet] [Masters thesis]. University of Manitoba; 2019. [cited 2021 Apr 22]. Available from: http://hdl.handle.net/1993/34194.

Council of Science Editors:

McCorquodale-Bauer K. Use of zebra mussel shells as an alternative mineral resource for lime production as a phosphorus precipitant. [Masters Thesis]. University of Manitoba; 2019. Available from: http://hdl.handle.net/1993/34194

University of Adelaide

23. Davis, Dominic Michael Walldorf. [EMBARGOED] Characterising the Performance of Vortex-Based Solar Thermal Particle Receiver-Reactors.

Degree: 2019, University of Adelaide

URL: http://hdl.handle.net/2440/120724

► This thesis investigates vortex-based solar thermal particle receivers to provide new understanding of the mechanisms controlling their performance. This new understanding is needed to optimise… (more)

▼ This thesis investigates vortex-based solar thermal particle receivers to provide new understanding of the mechanisms controlling their performance. This new understanding is needed to optimise a receiver on a case-by-case basis for the different requirements of a range of alternative potential applications. There is growing interest in the use of solid particles as the heat transfer medium in concentrating solar thermal systems because particles are e&cient absorbers of direct irradiation and have strong potential as a low-cost thermal storage medium. The vortex-based class of solar particle receiver is under development as a device for the solar heating of both inert particles, via sensible heat, and of reacting particles, via chemical (and sensible) heat. Such a receiver typically consists of a cylindrical cavity receiver, through which particles are conveyed by a vortex 'ow of gas so that the particles are directly irradiated by concentrated solar radiation entering the cavity through a circular aperture. This thesis supports the further development of the vortex-based solar particle receiver by characterising three different aspects of the performance of such a receiver. Firstly, the influence of key input and geometric parameters on the receiver thermal performance is presented. Next, fundamental insights into dimensionless parameters controlling particle residence time distributions within such receivers are provided. Finally, the performance of a vortex-based solar particle receiver in a common industrial thermochemical process is characterised. Key results and findings of this thesis have been published in two peer-reviewed research articles in the journals, Solar Energy and Green Chemistry, while a further two articles have been submitted to the journals Chemical Engineering Science and Solar Energy. A one-dimensional numerical model is developed to systematically characterise the heat and mass transport processes within vortex-based solar particle receivers and provide key insights into the factors affecting the thermal performance. The model adapts the zonal method to calculate heat and mass transport within the enclosure of the receiver, incorporating radiative and convective heat transfer between the particle phase, the gas phase and the receiver wall, together with re-radiative and conductive losses. Sensitivity studies of the thermal performance reveal that a vortex-based solar particle receiver can be configured to operate as either an air-heater or a particle-heater, depending primarily on the particle mass loading. Furthermore, assessment of the two-phase 'ow direction finds that a counter-flow (relative to the incident concentrated solar radiation) tends to result in a higher thermal efficiency than a co-flow direction. The first order trends of the sensitivity of the receiver’s thermal performance to the particle and air mass flow rates, particle size and receiver length are also reported, predicting overall receiver thermal efficiencies of up to 88%. It is, however, expected that the thermal… Advisors/Committee Members: Nathan, Graham (advisor), Saw, Woei (advisor), Chinnici, Alfonso (advisor), School of Mechanical Engineering (school).

Subjects/Keywords: Solar thermal; CST; particle; receiver; reactor; vortex; residence time; RTD; calcination; alumina

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APA (6^th Edition):

Davis, D. M. W. (2019). [EMBARGOED] Characterising the Performance of Vortex-Based Solar Thermal Particle Receiver-Reactors. (Thesis). University of Adelaide. Retrieved from http://hdl.handle.net/2440/120724

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

Chicago Manual of Style (16^th Edition):

Davis, Dominic Michael Walldorf. “[EMBARGOED] Characterising the Performance of Vortex-Based Solar Thermal Particle Receiver-Reactors.” 2019. Thesis, University of Adelaide. Accessed April 22, 2021. http://hdl.handle.net/2440/120724.

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

MLA Handbook (7^th Edition):

Davis, Dominic Michael Walldorf. “[EMBARGOED] Characterising the Performance of Vortex-Based Solar Thermal Particle Receiver-Reactors.” 2019. Web. 22 Apr 2021.

Vancouver:

Davis DMW. [EMBARGOED] Characterising the Performance of Vortex-Based Solar Thermal Particle Receiver-Reactors. [Internet] [Thesis]. University of Adelaide; 2019. [cited 2021 Apr 22]. Available from: http://hdl.handle.net/2440/120724.

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

Council of Science Editors:

Davis DMW. [EMBARGOED] Characterising the Performance of Vortex-Based Solar Thermal Particle Receiver-Reactors. [Thesis]. University of Adelaide; 2019. Available from: http://hdl.handle.net/2440/120724

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

University of the Western Cape

24. Totito, Thandiwe Crystal. Photocatalytic activity of supported TiO2 nanocrystals .

Degree: 2013, University of the Western Cape

URL: http://hdl.handle.net/11394/3834

► In recent times, the occurrence and presence of complex recalcitrant toxic contaminants in water and wastewater is increasing and consequently contributes to the non-availability of… (more)

▼ In recent times, the occurrence and presence of complex recalcitrant toxic contaminants in water and wastewater is increasing and consequently contributes to the non-availability of clean and safe drinking water. Water treatment is complex, time demanding and energy intensive due to the physico-chemical structural complexity and diversity of the pollutants. Non-availability of good drinking water has negatively affected human health and the ecosystem. Over the years, numerous conventional treatment techniques were used to degrade and remove these pollutants, but investigations indicated that some of the pollutants are not susceptible to conventional treatment. Advanced oxidation technology, among which heterogeneous photocatalysis (involving the use of a semiconductor) has emerged as one of the more promising techniques to remediate contaminated water. Titanium dioxide (TiO2) semiconductor photocatalysis is considered to be a good option due to its cost effectiveness, chemical and thermal stability, and inertness in the area of wastewater reclamation and re-use. However the post separation of the titania particles poses a threat to the wastewater remediation. Hence there is a need to develop a supported high surface area photocatalyst that will resolve the post separation challenge. This present study aimed to prepare high surface area TiO2 anatase nanocrystals supported on a stainless steel mesh. These new composite materials were used to remove methylene blue (MB) from aqueous solutions. The supporting procedure involved the thermal decomposition of a sol gel solution coated upon stainless steel mesh. The nanocrystalline anatase phase was formed by thermal decomposition on a stainless steel mesh coated with 8 % PAN/DMF/TiO2 sol gel formation calcined at varying temperatures of 300 °C, 400 °C, 500 °C and 600 °C. The heating rate of 50 °C/min and independent holding time of 1 h, 2 h, 3 h and 4 h were applied to find the optimum supporting conditions. The synthesised TiO2 nanocomposites materials were characterised using the following analytical techniques: XRD, HRSEM, EDS, HRTEM, SAED, FTIR and UV-Vis absorption spectroscopy materials were characterised, and the results indicate that synthesised TiO2 nanocrystals were in the anatase form, polycrystalline in nature, and contained additional carbon-carbon bonds from the polymer used during preparation with TiO2 particle sizes range from 13.6 nm to 2285 nm. Advisors/Committee Members: Petrik, Leslie F (advisor).

Subjects/Keywords: Photocatalysis; Sol gel; TiO2; Nanofibres; Nanocrystals; Calcination; Decomposition; Electrospinning; Coating; Immobilised; Stainless steel mesh

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APA (6^th Edition):

Totito, T. C. (2013). Photocatalytic activity of supported TiO2 nanocrystals . (Thesis). University of the Western Cape. Retrieved from http://hdl.handle.net/11394/3834

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

Chicago Manual of Style (16^th Edition):

Totito, Thandiwe Crystal. “Photocatalytic activity of supported TiO2 nanocrystals .” 2013. Thesis, University of the Western Cape. Accessed April 22, 2021. http://hdl.handle.net/11394/3834.

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

MLA Handbook (7^th Edition):

Totito, Thandiwe Crystal. “Photocatalytic activity of supported TiO2 nanocrystals .” 2013. Web. 22 Apr 2021.

Vancouver:

Totito TC. Photocatalytic activity of supported TiO2 nanocrystals . [Internet] [Thesis]. University of the Western Cape; 2013. [cited 2021 Apr 22]. Available from: http://hdl.handle.net/11394/3834.

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

Council of Science Editors:

Totito TC. Photocatalytic activity of supported TiO2 nanocrystals . [Thesis]. University of the Western Cape; 2013. Available from: http://hdl.handle.net/11394/3834

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

Brno University of Technology

25. Hájková, Iveta. Příprava vysokohodnotného sádrového pojiva: Preparation of high-valueable gypsum binder.

Degree: 2019, Brno University of Technology

URL: http://hdl.handle.net/11012/7982

► This work is oriented on the preparation of high-voluable sulphate binder based on gypsum waste. One of the potential mineral resources in Moravia is Pregips… (more)

Subjects/Keywords: Sádrovec; kalcinace; rotační sušárna; beta sádry; plastifikátor; Gypsum; calcination; rotary dryer; beta plaster; plasticiser

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APA (6^th Edition):

Hájková, I. (2019). Příprava vysokohodnotného sádrového pojiva: Preparation of high-valueable gypsum binder. (Thesis). Brno University of Technology. Retrieved from http://hdl.handle.net/11012/7982

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

Chicago Manual of Style (16^th Edition):

Hájková, Iveta. “Příprava vysokohodnotného sádrového pojiva: Preparation of high-valueable gypsum binder.” 2019. Thesis, Brno University of Technology. Accessed April 22, 2021. http://hdl.handle.net/11012/7982.

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

MLA Handbook (7^th Edition):

Hájková, Iveta. “Příprava vysokohodnotného sádrového pojiva: Preparation of high-valueable gypsum binder.” 2019. Web. 22 Apr 2021.

Vancouver:

Hájková I. Příprava vysokohodnotného sádrového pojiva: Preparation of high-valueable gypsum binder. [Internet] [Thesis]. Brno University of Technology; 2019. [cited 2021 Apr 22]. Available from: http://hdl.handle.net/11012/7982.

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

Council of Science Editors:

Hájková I. Příprava vysokohodnotného sádrového pojiva: Preparation of high-valueable gypsum binder. [Thesis]. Brno University of Technology; 2019. Available from: http://hdl.handle.net/11012/7982

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

Brno University of Technology

26. Hájková, Iveta. Vysokohodnotné síranové pojivo na bázi odpadních surovin: Waste material based high-performance sulphate binders.

Degree: 2019, Brno University of Technology

URL: http://hdl.handle.net/11012/175975

► The topic of this dissertation was the preparation of a high-quality sulphate binder based on secondary raw materials. For this purpose, the work was primarily… (more)

Subjects/Keywords: Sádrovec; odsíření; kalcinace; anhydrit; plastifikátor; zeta potenciál.; Gypsum; desulphurization; calcination; anhydrite; plasticizer; zeta potential.

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APA · Chicago · MLA · Vancouver · CSE | Export to Zotero / EndNote / Reference Manager

APA (6^th Edition):

Hájková, I. (2019). Vysokohodnotné síranové pojivo na bázi odpadních surovin: Waste material based high-performance sulphate binders. (Thesis). Brno University of Technology. Retrieved from http://hdl.handle.net/11012/175975

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

Chicago Manual of Style (16^th Edition):

Hájková, Iveta. “Vysokohodnotné síranové pojivo na bázi odpadních surovin: Waste material based high-performance sulphate binders.” 2019. Thesis, Brno University of Technology. Accessed April 22, 2021. http://hdl.handle.net/11012/175975.

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

MLA Handbook (7^th Edition):

Hájková, Iveta. “Vysokohodnotné síranové pojivo na bázi odpadních surovin: Waste material based high-performance sulphate binders.” 2019. Web. 22 Apr 2021.

Vancouver:

Hájková I. Vysokohodnotné síranové pojivo na bázi odpadních surovin: Waste material based high-performance sulphate binders. [Internet] [Thesis]. Brno University of Technology; 2019. [cited 2021 Apr 22]. Available from: http://hdl.handle.net/11012/175975.

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

Council of Science Editors:

Hájková I. Vysokohodnotné síranové pojivo na bázi odpadních surovin: Waste material based high-performance sulphate binders. [Thesis]. Brno University of Technology; 2019. Available from: http://hdl.handle.net/11012/175975

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

Brno University of Technology

27. Anderle, Milan. Vývoj modelu kalcinace pro ANSYS Fluent: Calcination model developement for ANSYS Fluent.

Degree: 2019, Brno University of Technology

URL: http://hdl.handle.net/11012/70058

► The aim of the diploma thesis was creating a decarbonisation model of lime, implementation the model into CFD tool ANSYS Fluent and to test the… (more)

Subjects/Keywords: Kalcinácia; dekarbonizácia vápenca; výpočtová dynamika prúdenia; CFD; Calcination; decarbonation of lime; Computational Fluid Dynamics; CFD

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APA (6^th Edition):

Anderle, M. (2019). Vývoj modelu kalcinace pro ANSYS Fluent: Calcination model developement for ANSYS Fluent. (Thesis). Brno University of Technology. Retrieved from http://hdl.handle.net/11012/70058

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

Chicago Manual of Style (16^th Edition):

Anderle, Milan. “Vývoj modelu kalcinace pro ANSYS Fluent: Calcination model developement for ANSYS Fluent.” 2019. Thesis, Brno University of Technology. Accessed April 22, 2021. http://hdl.handle.net/11012/70058.

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

MLA Handbook (7^th Edition):

Anderle, Milan. “Vývoj modelu kalcinace pro ANSYS Fluent: Calcination model developement for ANSYS Fluent.” 2019. Web. 22 Apr 2021.

Vancouver:

Anderle M. Vývoj modelu kalcinace pro ANSYS Fluent: Calcination model developement for ANSYS Fluent. [Internet] [Thesis]. Brno University of Technology; 2019. [cited 2021 Apr 22]. Available from: http://hdl.handle.net/11012/70058.

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

Council of Science Editors:

Anderle M. Vývoj modelu kalcinace pro ANSYS Fluent: Calcination model developement for ANSYS Fluent. [Thesis]. Brno University of Technology; 2019. Available from: http://hdl.handle.net/11012/70058

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

28. Safa, Ali Ibrahim, 1953-. Catalytic Calcination of Calcium Carbonate.

Degree: 1985, North Texas State University

URL: https://digital.library.unt.edu/ark:/67531/metadc330965/

► The calcination of calcium carbonate in a cement or a lime kiln uses approximately two to four times the theoretical quantity of energy predicted from… (more)

Subjects/Keywords: catalytic calcination; calcium carbonate; Calcium carbonate.

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APA (6^th Edition):

Safa, Ali Ibrahim, 1. (1985). Catalytic Calcination of Calcium Carbonate. (Thesis). North Texas State University. Retrieved from https://digital.library.unt.edu/ark:/67531/metadc330965/

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

Chicago Manual of Style (16^th Edition):

Safa, Ali Ibrahim, 1953-. “Catalytic Calcination of Calcium Carbonate.” 1985. Thesis, North Texas State University. Accessed April 22, 2021. https://digital.library.unt.edu/ark:/67531/metadc330965/.

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

MLA Handbook (7^th Edition):

Safa, Ali Ibrahim, 1953-. “Catalytic Calcination of Calcium Carbonate.” 1985. Web. 22 Apr 2021.

Vancouver:

Safa, Ali Ibrahim 1. Catalytic Calcination of Calcium Carbonate. [Internet] [Thesis]. North Texas State University; 1985. [cited 2021 Apr 22]. Available from: https://digital.library.unt.edu/ark:/67531/metadc330965/.

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

Council of Science Editors:

Safa, Ali Ibrahim 1. Catalytic Calcination of Calcium Carbonate. [Thesis]. North Texas State University; 1985. Available from: https://digital.library.unt.edu/ark:/67531/metadc330965/

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

University of Sydney

29. Mann, Jason Peter. Serpentine Activation for CO2 Sequestration .

Degree: 2014, University of Sydney

URL: http://hdl.handle.net/2123/12054

► Serpentinite calcination currently represents a key step for its activation within ex situ aqueous mineral carbonation. However, the dehydroxylation kinetics that govern this process remain… (more)

Subjects/Keywords: Carbon dioxide sequestration; Mineral carbonation; Serpentine; Serpentinite; Dehydroxylation; Flash calcination; Activation; Recrystallisation; Forsterite

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APA (6^th Edition):

Mann, J. P. (2014). Serpentine Activation for CO2 Sequestration . (Thesis). University of Sydney. Retrieved from http://hdl.handle.net/2123/12054

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

Chicago Manual of Style (16^th Edition):

Mann, Jason Peter. “Serpentine Activation for CO2 Sequestration .” 2014. Thesis, University of Sydney. Accessed April 22, 2021. http://hdl.handle.net/2123/12054.

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

MLA Handbook (7^th Edition):

Mann, Jason Peter. “Serpentine Activation for CO2 Sequestration .” 2014. Web. 22 Apr 2021.

Vancouver:

Mann JP. Serpentine Activation for CO2 Sequestration . [Internet] [Thesis]. University of Sydney; 2014. [cited 2021 Apr 22]. Available from: http://hdl.handle.net/2123/12054.

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

Council of Science Editors:

Mann JP. Serpentine Activation for CO2 Sequestration . [Thesis]. University of Sydney; 2014. Available from: http://hdl.handle.net/2123/12054

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

University of Texas – Austin

30. Burris, Lisa Elanna. Increasing the reactivity of natural zeolites used as supplementary cementitious materials.

Degree: PhD, Civil Engineering, 2014, University of Texas – Austin

URL: http://hdl.handle.net/2152/25935

► This work examined the effects of thermal and chemical treatments on zeolite reactivity and determined the zeolite properties governing the development of compressive strengths and… (more)

▼ This work examined the effects of thermal and chemical treatments on zeolite reactivity and determined the zeolite properties governing the development of compressive strengths and pozzolanic reactivity. Zeolites are naturally occurring aluminosilicate minerals found abundantly around the world. Incorporation of zeolites in cement mixtures has been shown by past research to increase concrete’s compressive strength and durability. In addition, use of zeolites as SCMs can decrease the environmental impact and energy demands associated with cement production for reinforced concrete structures. Further, in contrast to man-made SCMs such as fly ash, zeolite minerals provide a reliable and readily available SCM source, not affected by the production limits and regulations of unrelated industries such as the coal power industry. In this work, six sources of naturally occurring clinoptilolite zeolite were examined. The zeolites were first characterized using x-ray fluorescence, quantitative xray diffraction, thermal analysis, particle size analysis, pore size distribution and surface area analysis, and scanning electron microscopy. Cation exchange capacity was also tested for one of the zeolites. Following comprehensive material characterization, the six pozzolanic reactivity of the natural zeolites was determined by measuring the quantity of calcium hydroxide in paste after 28 or 90 days, by measuring calcium hydroxide consumption of the zeolite in solution and by tracking the development of strengths of zeolite-cement mortars. Pretreatments that attempted to increase the reactivity of the zeolites, including calcination, acid treatment, milling and cation exchange, were then tested and evaluated using the same methods of material characterization and testing mentioned previously. Last, the results of the reactivity testing were reanalyzed to determine which properties of natural zeolites, including particle size, nitrogen-available surface area, and composition, govern the development of compressive strengths, pozzolanic reactivity and improved cement hydration parameters of pastes and mortars using natural zeolites as SCMs. Pretreatment testing showed that milling and acid treatment successfully increased the reactivity of zeolites used as SCMs. Additionally, particle size was shown to be the dominant property in determining the development of compressive strengths while particle size and surface area of the zeolites contributed to zeolite pozzolanic reactivity. Advisors/Committee Members: Juenger, Maria C. G. (advisor).

Subjects/Keywords: Natural zeolite; Clinoptilolite; Reactivity; Supplementary cementitious materials; Concrete; Calcination; Acid; Milling; Cation exchange

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APA (6^th Edition):

Burris, L. E. (2014). Increasing the reactivity of natural zeolites used as supplementary cementitious materials. (Doctoral Dissertation). University of Texas – Austin. Retrieved from http://hdl.handle.net/2152/25935

Chicago Manual of Style (16^th Edition):

Burris, Lisa Elanna. “Increasing the reactivity of natural zeolites used as supplementary cementitious materials.” 2014. Doctoral Dissertation, University of Texas – Austin. Accessed April 22, 2021. http://hdl.handle.net/2152/25935.

MLA Handbook (7^th Edition):

Burris, Lisa Elanna. “Increasing the reactivity of natural zeolites used as supplementary cementitious materials.” 2014. Web. 22 Apr 2021.

Vancouver:

Burris LE. Increasing the reactivity of natural zeolites used as supplementary cementitious materials. [Internet] [Doctoral dissertation]. University of Texas – Austin; 2014. [cited 2021 Apr 22]. Available from: http://hdl.handle.net/2152/25935.

Council of Science Editors:

Burris LE. Increasing the reactivity of natural zeolites used as supplementary cementitious materials. [Doctoral Dissertation]. University of Texas – Austin; 2014. Available from: http://hdl.handle.net/2152/25935

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Open Access Theses and Dissertations