+publisher:"University of Oklahoma" +contributor:("Lobban, Lance")

University of Oklahoma

1. Goktas, Selda. Development of a Novel Ex Vivo Scaffold for the Regeneration of Periodontal Tissues.

Degree: PhD, 2011, University of Oklahoma

► In order to create functional HUV bioscaffolds for periodontal tissue engineering applications, in vitro 3D culture conditions were developed and optimized. The goal was to… (more)

Subjects/Keywords: Guided tissue regeneration; Vascular grafts; Tissue engineering; Periodontal disease – Treatment

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APA (6^th Edition):

Goktas, S. (2011). Development of a Novel Ex Vivo Scaffold for the Regeneration of Periodontal Tissues. (Doctoral Dissertation). University of Oklahoma. Retrieved from http://hdl.handle.net/11244/318693

Chicago Manual of Style (16^th Edition):

Goktas, Selda. “Development of a Novel Ex Vivo Scaffold for the Regeneration of Periodontal Tissues.” 2011. Doctoral Dissertation, University of Oklahoma. Accessed March 07, 2021. http://hdl.handle.net/11244/318693.

MLA Handbook (7^th Edition):

Goktas, Selda. “Development of a Novel Ex Vivo Scaffold for the Regeneration of Periodontal Tissues.” 2011. Web. 07 Mar 2021.

Vancouver:

Goktas S. Development of a Novel Ex Vivo Scaffold for the Regeneration of Periodontal Tissues. [Internet] [Doctoral dissertation]. University of Oklahoma; 2011. [cited 2021 Mar 07]. Available from: http://hdl.handle.net/11244/318693.

Council of Science Editors:

Goktas S. Development of a Novel Ex Vivo Scaffold for the Regeneration of Periodontal Tissues. [Doctoral Dissertation]. University of Oklahoma; 2011. Available from: http://hdl.handle.net/11244/318693

University of Oklahoma

2. Siamizade, Mahmud Reza. A global optimization framework for stochastic integrated refinery planning with nonlinear unit models under demand and price uncertainties.

Degree: PhD, 2020, University of Oklahoma

URL: http://hdl.handle.net/11244/325618

► The refining industry is facing increased volatility in the global market such as lower economic margins. In this situation, refinery production planning becomes a substantial… (more)

▼ The refining industry is facing increased volatility in the global market such as lower economic margins. In this situation, refinery production planning becomes a substantial tool to utilize all potentials to extend the economic margin to its maximum level. Classical refinery production planning models employ input-output relationships for different refinery units. However, these input-output relationships usually do not include decision making variables related to the units’ operation (pressure, temperature, etc.). In addition, they fail to capture the nonlinear nature of the refinery units and the inaccuracy caused by these models may reduce the overall profitability or compromise product quality. The refinery business involves tasks spanning from unloading crude oil at the refinery’s front end, generating utilities for refinery operations, blending different crudes and procuring crude blends to intermediate products, blending intermediates into final products and distributing refined products from refinery to distribution centers by means like pipelines. The traditional approach for the planning problem of these sub-systems is a sequential hierarchical approach. In reality, refinery processes are tightly interconnected and any attempt to solve this problem in a sequential push or pull manner may result in infeasible or suboptimal solutions. Eventually, the oil industry is subject to uncertainties such as unstable prices and unpredictable product demands. The existence of uncertainty in such parameters can seriously affect the optimization results and lead to inefficient operations. Nevertheless, there are challenges associated with the integrated optimization approach which arise from the difficulty of obtaining a solution with reasonable quality and time. The corresponding integrated model of the refinery operations with nonlinear unit correlations under uncertainty results in a computationally intensive nonconvex MINLP (Mixed Integer Nonlinear Programming) model due to the presence of bilinear, signomial, exponential or logarithmic terms in some of the mass balance, product yield and quality constraints. A further complexity is introduced in attempting to obtain a globally optimal solution. The standard methods for solving this complex refinery wide optimization problem may fail to converge to a solution or lead to sub-optimal solutions. Despite these complexities, this research presents a novel optimization heuristic for the integrated supply chain model of a refinery network. The production planning model of the refinery employs two different nonlinear models for the distillation unit utilizing correlations based on the Geddes fractionation index (FI) and a swing-cut (SW) data-based model and empirical nonlinear models for the remaining refinery units. The main contribution of this research is the development of an aggregation /disaggregation methodology based on lumped variable linearization (LVL) and normalized multiparametric disaggregation (NMDT) techniques through a two-level optimization algorithm and… Advisors/Committee Members: O'Rear III, Edgar (advisor), Trafalis, Theodore (committee member), Lobban, Lance (committee member), Harwell, Jeffrey (committee member), Harrison, Roger (committee member).

Subjects/Keywords: Engineering, Chemical.; Operations Research.; Engineering, Petroleum.

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APA (6^th Edition):

Siamizade, M. R. (2020). A global optimization framework for stochastic integrated refinery planning with nonlinear unit models under demand and price uncertainties. (Doctoral Dissertation). University of Oklahoma. Retrieved from http://hdl.handle.net/11244/325618

Chicago Manual of Style (16^th Edition):

Siamizade, Mahmud Reza. “A global optimization framework for stochastic integrated refinery planning with nonlinear unit models under demand and price uncertainties.” 2020. Doctoral Dissertation, University of Oklahoma. Accessed March 07, 2021. http://hdl.handle.net/11244/325618.

MLA Handbook (7^th Edition):

Siamizade, Mahmud Reza. “A global optimization framework for stochastic integrated refinery planning with nonlinear unit models under demand and price uncertainties.” 2020. Web. 07 Mar 2021.

Vancouver:

Siamizade MR. A global optimization framework for stochastic integrated refinery planning with nonlinear unit models under demand and price uncertainties. [Internet] [Doctoral dissertation]. University of Oklahoma; 2020. [cited 2021 Mar 07]. Available from: http://hdl.handle.net/11244/325618.

Council of Science Editors:

Siamizade MR. A global optimization framework for stochastic integrated refinery planning with nonlinear unit models under demand and price uncertainties. [Doctoral Dissertation]. University of Oklahoma; 2020. Available from: http://hdl.handle.net/11244/325618

University of Oklahoma

3. bui, tuong. DESIGN OF SOLID ACID CATALYSTS FOR BIOMASS UPGRADING VIA C-C COUPLING AND DEHYDRATION REACTIONS.

Degree: PhD, 2018, University of Oklahoma

URL: http://hdl.handle.net/11244/316750

► Furanics fraction has been a major obstacle that impedes the feasibility of practical upgrading of bio-oil. The high reactivity of species existing in the mixture… (more)

▼ Furanics fraction has been a major obstacle that impedes the feasibility of practical upgrading of bio-oil. The high reactivity of species existing in the mixture favors humins formation via polymerization. This leads to rapid catalyst deactivation and carbon loss. Via the Piancatelli ring rearrangement, furfural, one of the most abundant species found in the second-stage of biomass torrefraction, can be stabilized into cyclopentanone (CPO) which can be used as a potential building block for C-C coupling reaction. This work covers two main sections. In the first part, different propitious upgrading strategies, focusing on using CPO as the building block for C-C coupling reactions (hydroxylalkylation, aldol condensation and alkylation) with other available oxygenates existing in a bio-oil mixture have been investigated. For example, via aldol condensation/hydroxyalkylation pathway and a following hydrodeoxygenation step, a mixture of C7-C16 saturated hydrocarbons, which are in the gasoline/diesel range can be effectively produced. Over 90% efficiency of the whole catalytic upgrading process starting from CPO has been demonstrated, which highlights the potential of this strategy for future biofuel applications. Along with the practical investigations, fundamental studies have also been conducted to give some extensive insights into the reaction mechanisms, active site requirements as well as the effects of water, a commonly found impurity in biomass conversion, to the catalytic activity and the stability of the catalysts. The second section mainly focuses on designing suitable solid acid catalysts that could be applied for the bio-oil upgrading processes. The catalysts have to satisfy several requirements including high activity, stability and resistance against deactivation in harsh chemical environments (high temperature, high water content, polar solvent, etc.). The results have shown that zeolites and mesoporous silica are susceptible to the water/polar species attack, caused by the presence of surface silanols. This results in rapid deactivation and structure collapse. The effective way to improve hydrothermal stability of the catalysts is to reduce the density of surface silanols via functionalization with organic-functional groups which could increases the surface hydrophobicity and protect the surface from water Advisors/Committee Members: Resasco, Daniel (advisor), Sabatini, David (committee member), Crossley, Steven (committee member), Lobban, Lance (committee member), Wang, Bin (committee member).

Subjects/Keywords: Biomass upgrading; C-C coupling; dehydration; solid acids; catalysis

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APA (6^th Edition):

bui, t. (2018). DESIGN OF SOLID ACID CATALYSTS FOR BIOMASS UPGRADING VIA C-C COUPLING AND DEHYDRATION REACTIONS. (Doctoral Dissertation). University of Oklahoma. Retrieved from http://hdl.handle.net/11244/316750

Chicago Manual of Style (16^th Edition):

bui, tuong. “DESIGN OF SOLID ACID CATALYSTS FOR BIOMASS UPGRADING VIA C-C COUPLING AND DEHYDRATION REACTIONS.” 2018. Doctoral Dissertation, University of Oklahoma. Accessed March 07, 2021. http://hdl.handle.net/11244/316750.

MLA Handbook (7^th Edition):

bui, tuong. “DESIGN OF SOLID ACID CATALYSTS FOR BIOMASS UPGRADING VIA C-C COUPLING AND DEHYDRATION REACTIONS.” 2018. Web. 07 Mar 2021.

Vancouver:

bui t. DESIGN OF SOLID ACID CATALYSTS FOR BIOMASS UPGRADING VIA C-C COUPLING AND DEHYDRATION REACTIONS. [Internet] [Doctoral dissertation]. University of Oklahoma; 2018. [cited 2021 Mar 07]. Available from: http://hdl.handle.net/11244/316750.

Council of Science Editors:

bui t. DESIGN OF SOLID ACID CATALYSTS FOR BIOMASS UPGRADING VIA C-C COUPLING AND DEHYDRATION REACTIONS. [Doctoral Dissertation]. University of Oklahoma; 2018. Available from: http://hdl.handle.net/11244/316750

University of Oklahoma

4. Heck, Margaret. Investigation of Flow through Complicated Microfluidic Devices and over Micropatterned Surfaces using Computational Fluid Dynamics.

Degree: PhD, 2015, University of Oklahoma

URL: http://hdl.handle.net/11244/23321

► Computational fluid dynamics is used to study two distinct areas of engineering interest: microfluidic systems involving superhydrophobic surfaces and blood pumps. Superhydrophobic surfaces, which can… (more)

Subjects/Keywords: Computational fluid dynamics; microfluidics; blood pump

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APA (6^th Edition):

Heck, M. (2015). Investigation of Flow through Complicated Microfluidic Devices and over Micropatterned Surfaces using Computational Fluid Dynamics. (Doctoral Dissertation). University of Oklahoma. Retrieved from http://hdl.handle.net/11244/23321

Chicago Manual of Style (16^th Edition):

Heck, Margaret. “Investigation of Flow through Complicated Microfluidic Devices and over Micropatterned Surfaces using Computational Fluid Dynamics.” 2015. Doctoral Dissertation, University of Oklahoma. Accessed March 07, 2021. http://hdl.handle.net/11244/23321.

MLA Handbook (7^th Edition):

Heck, Margaret. “Investigation of Flow through Complicated Microfluidic Devices and over Micropatterned Surfaces using Computational Fluid Dynamics.” 2015. Web. 07 Mar 2021.

Vancouver:

Heck M. Investigation of Flow through Complicated Microfluidic Devices and over Micropatterned Surfaces using Computational Fluid Dynamics. [Internet] [Doctoral dissertation]. University of Oklahoma; 2015. [cited 2021 Mar 07]. Available from: http://hdl.handle.net/11244/23321.

Council of Science Editors:

Heck M. Investigation of Flow through Complicated Microfluidic Devices and over Micropatterned Surfaces using Computational Fluid Dynamics. [Doctoral Dissertation]. University of Oklahoma; 2015. Available from: http://hdl.handle.net/11244/23321

University of Oklahoma

5. Ngo, Duong. CYCLOPENTANONE ALDOL CONDENSATION – EFFECTS OF SURFACE SILANIZATION, ACETONE AND WATER CO-FEEDING ON CATALYTIC BEHAVIORS OF MAGNESIUM OXIDE-BASED SOLIDS.

Degree: PhD, 2018, University of Oklahoma

URL: http://hdl.handle.net/11244/316757

► Cyclopentanone is a promising building block in the conversion of biomass to fuels. It can be readily obtained from furanics derived from biomass and can… (more)

▼ Cyclopentanone is a promising building block in the conversion of biomass to fuels. It can be readily obtained from furanics derived from biomass and can be converted to intermediate products in the molecular weight range compatible with fuels via C-C bond forming reactions. Among them, aldol condensation is a promising route. Conventional MgO catalysts are intrinsically active to catalyze this reaction, but they usually exhibit low surface areas and low stability in the presence of liquid water. The nitrate-citrate combustion method results in high-surface-area oxides with high condensation activity, but they are still susceptible to water attack. Here, hydrophobic MgO-based catalysts functionalized with octadecyltrichlorosilane (OTS) are shown to exhibit remarkable stability in the liquid phase under conditions in which a conventional MgO deactivates in short time. A follow-up study investigates the effect of co-fed water on the MgO-catalyzed cyclopentanone self-aldol condensation. As more water is added, the initial rate on hydrophilic MgO drops rapidly due to site blockage. Meanwhile, the initial rate on hydrophobic MgO-OTS increases in water vapor before decreasing in excess liquid water. It is noteworthy that under dry conditions, kinetic studies indicate a shift in the rate-limiting step: from first-order α-H abstraction on MgO to second-order C-C coupling on MgO-OTS. A proposal is that the high OTS loading limits the interaction between cyclopentanone surface species and reduces the rate of C-C coupling. This step is, however, apparently favored by surface water clusters which bridge a liquid cyclopentanone to an Mg2+ acid site. Such assistance allows the electrophile to undergo a distant polarization which can facilitate the subsequent nucleophilic attack. Another important biomass upgrading process is the cyclopentanone-acetone cross-aldol condensation, since the primary products – especially cyclopentanone-activated compounds – can be hydrodeoxygenated into high octane-numbered hydrocarbons. Here, the reaction is catalyzed by high-surface-area MgO. Initial rates with various feed ratios, DFT calculations and adsorption measurements confirm both the preferential chemisorption and α-H abstraction of cyclopentanone with respect to acetone. For each ketone reactant, α-H abstraction is rate-limiting, but subsequent C-C coupling equilibria along with the feed composition control the product distribution. Advisors/Committee Members: Resasco, Daniel (advisor), Butler, Elizabeth (committee member), Crossley, Steven (committee member), Harwell, Jeffrey (committee member), Lobban, Lance (committee member).

Subjects/Keywords: aldol condensation; cyclopentanone; acetone; water; co-feeding; magnesium oxide; deactivation; functionalization; octadecyltrichlorosilane; nucleophilic addition

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

APA (6^th Edition):

Ngo, D. (2018). CYCLOPENTANONE ALDOL CONDENSATION – EFFECTS OF SURFACE SILANIZATION, ACETONE AND WATER CO-FEEDING ON CATALYTIC BEHAVIORS OF MAGNESIUM OXIDE-BASED SOLIDS. (Doctoral Dissertation). University of Oklahoma. Retrieved from http://hdl.handle.net/11244/316757

Chicago Manual of Style (16^th Edition):

Ngo, Duong. “CYCLOPENTANONE ALDOL CONDENSATION – EFFECTS OF SURFACE SILANIZATION, ACETONE AND WATER CO-FEEDING ON CATALYTIC BEHAVIORS OF MAGNESIUM OXIDE-BASED SOLIDS.” 2018. Doctoral Dissertation, University of Oklahoma. Accessed March 07, 2021. http://hdl.handle.net/11244/316757.

MLA Handbook (7^th Edition):

Ngo, Duong. “CYCLOPENTANONE ALDOL CONDENSATION – EFFECTS OF SURFACE SILANIZATION, ACETONE AND WATER CO-FEEDING ON CATALYTIC BEHAVIORS OF MAGNESIUM OXIDE-BASED SOLIDS.” 2018. Web. 07 Mar 2021.

Vancouver:

Ngo D. CYCLOPENTANONE ALDOL CONDENSATION – EFFECTS OF SURFACE SILANIZATION, ACETONE AND WATER CO-FEEDING ON CATALYTIC BEHAVIORS OF MAGNESIUM OXIDE-BASED SOLIDS. [Internet] [Doctoral dissertation]. University of Oklahoma; 2018. [cited 2021 Mar 07]. Available from: http://hdl.handle.net/11244/316757.

Council of Science Editors:

Ngo D. CYCLOPENTANONE ALDOL CONDENSATION – EFFECTS OF SURFACE SILANIZATION, ACETONE AND WATER CO-FEEDING ON CATALYTIC BEHAVIORS OF MAGNESIUM OXIDE-BASED SOLIDS. [Doctoral Dissertation]. University of Oklahoma; 2018. Available from: http://hdl.handle.net/11244/316757

University of Oklahoma

6. GUMIDYALA, ABHISHEK. VAPOR PHASE UPGRADING OF RENEWABLE CARBOXYLIC ACIDS AND OXYGENATES OVER BRØNSTED ZEOLITES.

Degree: PhD, 2017, University of Oklahoma

URL: http://hdl.handle.net/11244/50937

► Ketonization of acetic acid is a powerful route to convert these problematic acids into stable building blocks to produce fuels and chemicals. This reaction is… (more)

Subjects/Keywords: PHD DISSERTATION ON UPGRADING OXYGENATES FROM BIOMASS OVER ZEOLITES

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APA (6^th Edition):

GUMIDYALA, A. (2017). VAPOR PHASE UPGRADING OF RENEWABLE CARBOXYLIC ACIDS AND OXYGENATES OVER BRØNSTED ZEOLITES. (Doctoral Dissertation). University of Oklahoma. Retrieved from http://hdl.handle.net/11244/50937

Chicago Manual of Style (16^th Edition):

GUMIDYALA, ABHISHEK. “VAPOR PHASE UPGRADING OF RENEWABLE CARBOXYLIC ACIDS AND OXYGENATES OVER BRØNSTED ZEOLITES.” 2017. Doctoral Dissertation, University of Oklahoma. Accessed March 07, 2021. http://hdl.handle.net/11244/50937.

MLA Handbook (7^th Edition):

GUMIDYALA, ABHISHEK. “VAPOR PHASE UPGRADING OF RENEWABLE CARBOXYLIC ACIDS AND OXYGENATES OVER BRØNSTED ZEOLITES.” 2017. Web. 07 Mar 2021.

Vancouver:

GUMIDYALA A. VAPOR PHASE UPGRADING OF RENEWABLE CARBOXYLIC ACIDS AND OXYGENATES OVER BRØNSTED ZEOLITES. [Internet] [Doctoral dissertation]. University of Oklahoma; 2017. [cited 2021 Mar 07]. Available from: http://hdl.handle.net/11244/50937.

Council of Science Editors:

GUMIDYALA A. VAPOR PHASE UPGRADING OF RENEWABLE CARBOXYLIC ACIDS AND OXYGENATES OVER BRØNSTED ZEOLITES. [Doctoral Dissertation]. University of Oklahoma; 2017. Available from: http://hdl.handle.net/11244/50937

University of Oklahoma

7. Waters, Christopher. Understanding Thermochemical Process And Feedstock Compositional Impacts On Strategies To Control Pyrolysis And Torrefaction Product Distributions.

Degree: PhD, 2016, University of Oklahoma

URL: http://hdl.handle.net/11244/34545

► Growing concern about the effects of post-Industrial revolution fossil carbon dioxide release has led to large-scale research efforts to understand how to address and mitigate… (more)

▼ Growing concern about the effects of post-Industrial revolution fossil carbon dioxide release has led to large-scale research efforts to understand how to address and mitigate future fossil CO2 emissions. Within the scope of products and services that have been enabled by the extraction of fossil hydrocarbon sources, those that rely on energy release by combustion – that is, electricity generation and transportation fuels – are considered the primary culprit in the observed increase of atmospheric CO2 levels. While various mature technologies exist for the generation of electrical power without the need for combustion of coal, natural gas, or liquid fuels, there are significantly more difficult engineering challenges involved in supplying so-called “zero emission” or “carbon neutral” energy storage solutions for transportation which can displace petroleum-based products. Numerous studies point to the possibility of displacing or replacing petroleum use for transportation fuels via the industrial production of liquid fuels from thermochemical conversion of biomass. As biomass can be a renewable and sustainable non-fossil source of organic molecules, it is hypothesized that it is possible to develop conversion strategies and technologies that allow society to retain the advantages and existing infrastructure associated with liquid hydrocarbon fuels without the associated fossil CO2 release. However, barring extensive regulatory requirements, any biomass-based technologies that seek to displace petroleum on a wide scale must be economically viable. For liquid biofuels, lowering processing costs and improving total fuel yields per acre are some of the significant engineering challenges that hinder economic viability. In this contribution, we consider the effects of changing various process conditions during biomass conversions, as well as develop an understanding of what compositional features of the biomass are most important to the resulting thermochemical product distribution. By understanding how and why the process conditions and the biomass feedstock compositions affect the resulting thermochemical product distribution, parallel development of feedstocks and processes tailored for those feedstocks can occur. This combined approach may help accelerate progress towards more viable biofuels production and therefore help accelerate petroleum displacement in transportation fuels. Advisors/Committee Members: Lobban, Lance (advisor), Bartley, Laura (committee member), Crossley, Steven (committee member), Mallinson, Richard (committee member), Wang, Bin (committee member).

Subjects/Keywords: pyrolysis; chemical engineering; biology

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APA (6^th Edition):

Waters, C. (2016). Understanding Thermochemical Process And Feedstock Compositional Impacts On Strategies To Control Pyrolysis And Torrefaction Product Distributions. (Doctoral Dissertation). University of Oklahoma. Retrieved from http://hdl.handle.net/11244/34545

Chicago Manual of Style (16^th Edition):

Waters, Christopher. “Understanding Thermochemical Process And Feedstock Compositional Impacts On Strategies To Control Pyrolysis And Torrefaction Product Distributions.” 2016. Doctoral Dissertation, University of Oklahoma. Accessed March 07, 2021. http://hdl.handle.net/11244/34545.

MLA Handbook (7^th Edition):

Waters, Christopher. “Understanding Thermochemical Process And Feedstock Compositional Impacts On Strategies To Control Pyrolysis And Torrefaction Product Distributions.” 2016. Web. 07 Mar 2021.

Vancouver:

Waters C. Understanding Thermochemical Process And Feedstock Compositional Impacts On Strategies To Control Pyrolysis And Torrefaction Product Distributions. [Internet] [Doctoral dissertation]. University of Oklahoma; 2016. [cited 2021 Mar 07]. Available from: http://hdl.handle.net/11244/34545.

Council of Science Editors:

Waters C. Understanding Thermochemical Process And Feedstock Compositional Impacts On Strategies To Control Pyrolysis And Torrefaction Product Distributions. [Doctoral Dissertation]. University of Oklahoma; 2016. Available from: http://hdl.handle.net/11244/34545

University of Oklahoma

8. Pham, Tu. Mechanistic Understanding of Catalytic Upgrading Reaction of Biomass-Derived C2 Oxygenates.

Degree: PhD, 2014, University of Oklahoma

URL: http://hdl.handle.net/11244/10399

► Lignocellulosic biomass, being the promising renewable source of carbon, has a great potential to serve as a sustainable platform for the production of fuels and… (more)

▼ Lignocellulosic biomass, being the promising renewable source of carbon, has a great potential to serve as a sustainable platform for the production of fuels and chemicals. The conversion of lignocellulose to fuels and chemicals requires the effective utilization of small light oxygenates, in particular, C2 as the major compounds derived from hemicellulose portion. In this study, catalytic processes for the conversion of biomass to fuels and chemicals were developed and investigated through two important C2 platform molecules, acetic acid and ethanol. In the first part, catalytic processing of acetic acid as a common product formed in biomass pyrolysis was studied. Ketonization is an ideal reaction for upgrading of this compound as it removes acidity and oxygen as well as creates C-C bonds that enlarge carbon backbones and maximize carbon yields in the fuel range. In this study, we have developed a new catalyst, Ru/TiO2 that shows high activity and selectivity for ketonization of acetic acid in both vapor and liquid (organic and aqueous) phase. A rigorous kinetics study using carboxylic acids of varying carbon chain length, i.e., acetic, propionic, and butyric acid have been conducted over this catalyst. A thorough analysis built upon a Langmuir Hinshelwood (LH) model and transition state theory (TST) shows that the reaction follows a second-order expression with respect to carboxylic acids. The heat of adsorption was found very similar for the three acids, in spite of their different chain lengths, and significantly higher than those of the ketonization products, i.e. ketone, water and CO2. The change in adsorption entropy of the acids (in absolute value) with respect to the gas phase was found to decrease with increasing chain length. These results are consistent with a strongly adsorbed bidentate configuration, in which the main interaction with the surface is via the carboxylic group while the alkyl group moves rather freely. Activation energy derived from the LH model as well as activation enthalpy and entropy derived from TST provided insight into the reaction intermediates. Both of the latter two parameters were found to increase with increasing carbon chain length of the acids. This compensation effect can be interpreted in terms of the nature of the transition state. It is concluded that ketonization proceeds through a β-ketoacid intermediate with an early transition state, in which the C-C bond forms. In the second part, catalytic conversion of bio-ethanol as an economically attractive feedstock to a valuable chemical, i.e. 1,3-butadiene, was investigated. This study provides a method to optimize the key intermediate step in butadiene production process from ethanol, which is the conversion of acetaldehyde and ethanol to crotonaldehyde and crotyl alcohol. This process requires an appropriate balance of acid and basic sites on the catalyst surface to maximize the yields of the crotonaldehyde and crotyl alcohol. By tailoring the molar ratio of the MgO and B2O3 during catalyst preparation through a… Advisors/Committee Members: Resasco, Daniel (advisor), Crossley, Steven (committee member), Lobban, Lance (committee member), Jentoft, Friedrike (committee member), Glatzhofer, Daniel (committee member).

Subjects/Keywords: Chemical Engineering (Catalysis)

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APA (6^th Edition):

Pham, T. (2014). Mechanistic Understanding of Catalytic Upgrading Reaction of Biomass-Derived C2 Oxygenates. (Doctoral Dissertation). University of Oklahoma. Retrieved from http://hdl.handle.net/11244/10399

Chicago Manual of Style (16^th Edition):

Pham, Tu. “Mechanistic Understanding of Catalytic Upgrading Reaction of Biomass-Derived C2 Oxygenates.” 2014. Doctoral Dissertation, University of Oklahoma. Accessed March 07, 2021. http://hdl.handle.net/11244/10399.

MLA Handbook (7^th Edition):

Pham, Tu. “Mechanistic Understanding of Catalytic Upgrading Reaction of Biomass-Derived C2 Oxygenates.” 2014. Web. 07 Mar 2021.

Vancouver:

Pham T. Mechanistic Understanding of Catalytic Upgrading Reaction of Biomass-Derived C2 Oxygenates. [Internet] [Doctoral dissertation]. University of Oklahoma; 2014. [cited 2021 Mar 07]. Available from: http://hdl.handle.net/11244/10399.

Council of Science Editors:

Pham T. Mechanistic Understanding of Catalytic Upgrading Reaction of Biomass-Derived C2 Oxygenates. [Doctoral Dissertation]. University of Oklahoma; 2014. Available from: http://hdl.handle.net/11244/10399

University of Oklahoma

9. Anaya, Felipe. FISCHER-TROPSCH SYNTHESIS ON HYDROPHOBIC CATALYSTS IN BIPHASIC MEDIA.

Degree: PhD, 2018, University of Oklahoma

URL: http://hdl.handle.net/11244/317117

► Fischer-Tropsch (FT) synthesis stands out as a relevant alternative technology for the production of liquid fuels. Natural gas, coal, biomass and other carbon-containing raw materials… (more)

▼ Fischer-Tropsch (FT) synthesis stands out as a relevant alternative technology for the production of liquid fuels. Natural gas, coal, biomass and other carbon-containing raw materials can be converted to syngas (CO and H2), that in turn is fed to Fischer-Tropsch reactors, to produce a wide range of hydrocarbon products. Various reactor systems have been developed and tested successfully for their utilization in Fischer-Tropsch synthesis. High-temperature reactors are typically designed to obtain high concentrations of branched hydrocarbons and alcohols while low-temperature reactors primarily produce high concentrations of linear alkanes and alkenes. Low-temperature reactors, typically slurry bubble column or multi-tubular, have shown great promise for further developments in industrial applications due to advantages such as efficient heat transfer, uniform temperatures, reduced diffusion limitations, high catalyst productivity, ease of catalyst regeneration, and low costs. At conditions of low temperature, FT products are present in the liquid phase. Therefore, it is of interest to investigate the effects of liquid media on the activity and selectivity of these FT reactors. Fischer-Tropsch in biphasic media benefits from the present of liquid water that enhances FT rates and the organic phase that solubilizes hydrocarbon products facilitating product separation. Interestingly, effects of organic phases on FT rates have not been discussed extensively. In this dissertation, the influence organic solvents and catalyst hydrophobicity on FT is investigated in single organic and biphasic aqueous/organic systems . A systematic study of catalyst hydrophobicity on FT rates with various supports is carried out and trends in acitivity and selectivity are discussed based on mechanistic insights recently presented in the literature. Advisors/Committee Members: Resasco, Daniel (advisor), Lobban, Lance (committee member), Crossley, Steven (committee member), Wang, Bin (committee member), Sabatini, David (committee member).

Subjects/Keywords: Fischer-Tropsch; Catalysis; Emulsions; Hydrophobic catalysts; Organic solvent effect

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APA (6^th Edition):

Anaya, F. (2018). FISCHER-TROPSCH SYNTHESIS ON HYDROPHOBIC CATALYSTS IN BIPHASIC MEDIA. (Doctoral Dissertation). University of Oklahoma. Retrieved from http://hdl.handle.net/11244/317117

Chicago Manual of Style (16^th Edition):

Anaya, Felipe. “FISCHER-TROPSCH SYNTHESIS ON HYDROPHOBIC CATALYSTS IN BIPHASIC MEDIA.” 2018. Doctoral Dissertation, University of Oklahoma. Accessed March 07, 2021. http://hdl.handle.net/11244/317117.

MLA Handbook (7^th Edition):

Anaya, Felipe. “FISCHER-TROPSCH SYNTHESIS ON HYDROPHOBIC CATALYSTS IN BIPHASIC MEDIA.” 2018. Web. 07 Mar 2021.

Vancouver:

Anaya F. FISCHER-TROPSCH SYNTHESIS ON HYDROPHOBIC CATALYSTS IN BIPHASIC MEDIA. [Internet] [Doctoral dissertation]. University of Oklahoma; 2018. [cited 2021 Mar 07]. Available from: http://hdl.handle.net/11244/317117.

Council of Science Editors:

Anaya F. FISCHER-TROPSCH SYNTHESIS ON HYDROPHOBIC CATALYSTS IN BIPHASIC MEDIA. [Doctoral Dissertation]. University of Oklahoma; 2018. Available from: http://hdl.handle.net/11244/317117

University of Oklahoma

10. Shi, Dachuan. Fischer-Tropsch synthesis on carbon nanotube-supported catalysts in water-in-oil emulsion.

Degree: PhD, 2013, University of Oklahoma

URL: http://hdl.handle.net/11244/7893

► Fischer-Tropsch synthesis (FTS) is an important gas-to-liquids technology in the modern energy industry. The current trend is to carry it out in liquid reaction media… (more)

▼ Fischer-Tropsch synthesis (FTS) is an important gas-to-liquids technology in the modern energy industry. The current trend is to carry it out in liquid reaction media in order to take advantage of good heat transfer, high catalyst efficiency, convenience for catalyst regeneration/reloading and lower costs, due to either the use of liquid media or the associated reactor designs. Adding water vapor to FTS has been proven to promote the reaction in many catalyst systems, but there was no attempt prior to this point to add liquid water in organic media. The choice of catalyst supports would be critical from multiple perspectives. First of all, the co-existence of both water and oil necessitates a support that could maximize the liquid interface for better mass transfer as well as dispersion of the catalyst. The product-support interaction is another important issue, especially for FTS product in liquid phase where secondary reaction happens when primary products re-adsorb onto catalysts. And finally, as with any catalyst, the metal-support interaction greatly affects the catalyst particle sizes and reactivity. We chose Ru catalyst supported on a multi-walled carbon nanotube/MgO-Al2O3 hybrid as the catalyst support for biphasic FTS, and carried out systematic studies that rationalized the choice of the support in terms of catalyst activity, deactivation, production selectivity as well as product separation. As it turned out, the amphiphilic properties of the nanohybrid-supported catalyst and the thus formed emulsion system were among the essential factors in the successful implement of the concept. A comprehensive interpretation of the results and a comparative investigation with some other catalyst supports have revealed the importance of choosing the right catalyst support, as well as given a better understanding of the FTS mechanism that incorporates recent progress reported in literature. We then went on to study the synthesis of carbon nanotubes (CNTs) in the effort to find optimal conditions for their production. In addition, sharing similarities in mechanistic pathways in a broad sense, but with much heavier molecular weight, CNTs have stronger interaction with catalyst supports than FTS products and were therefore a more typical model to study and demonstrate the product-support interaction as well. On the planar substrate support, depending on the isotropy/anisotropy of the CNT-support interaction, either random networks or aligned arrays of CNT films were synthesized on the corresponding support. Here another important continuation from the study of FTS was the promoting effects of water. We’ve concluded that water facilitates CNT growth in the second step, i.e., the step where monomeric C units condense into CNTs, while in the case of FTS, water plays a role mostly in the first step of CO dissociating into the monomeric CH species. Finally, a novel method to fabricate devices of the CNT films were presented that tested the merits of using planar supports for CNT growth in actual… Advisors/Committee Members: Resasco, Daniel (advisor), Mallinson, Richard (committee member), Lobban, Lance (committee member), Crossley, Steven (committee member), Glatzhofer, Daniel (committee member).

Subjects/Keywords: Catalysis; Engineering, Chemical.; Reaction Engineering

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

APA (6^th Edition):

Shi, D. (2013). Fischer-Tropsch synthesis on carbon nanotube-supported catalysts in water-in-oil emulsion. (Doctoral Dissertation). University of Oklahoma. Retrieved from http://hdl.handle.net/11244/7893

Chicago Manual of Style (16^th Edition):

Shi, Dachuan. “Fischer-Tropsch synthesis on carbon nanotube-supported catalysts in water-in-oil emulsion.” 2013. Doctoral Dissertation, University of Oklahoma. Accessed March 07, 2021. http://hdl.handle.net/11244/7893.

MLA Handbook (7^th Edition):

Shi, Dachuan. “Fischer-Tropsch synthesis on carbon nanotube-supported catalysts in water-in-oil emulsion.” 2013. Web. 07 Mar 2021.

Vancouver:

Shi D. Fischer-Tropsch synthesis on carbon nanotube-supported catalysts in water-in-oil emulsion. [Internet] [Doctoral dissertation]. University of Oklahoma; 2013. [cited 2021 Mar 07]. Available from: http://hdl.handle.net/11244/7893.

Council of Science Editors:

Shi D. Fischer-Tropsch synthesis on carbon nanotube-supported catalysts in water-in-oil emulsion. [Doctoral Dissertation]. University of Oklahoma; 2013. Available from: http://hdl.handle.net/11244/7893

University of Oklahoma

11. Mehdad, Ali. MIXED METAL CARBIDES: UNDERSTANDING THE SYNTHESIS, SURFACE PROPERTIES AND CATALYTIC ACTIVITIES.

Degree: PhD, 2015, University of Oklahoma

URL: http://hdl.handle.net/11244/15497

► Metal carbides are formed when carbon is inserted into the lattice of the metal, and metal-carbon bonds are formed. In fact, formation of the carbon-metal… (more)

▼ Metal carbides are formed when carbon is inserted into the lattice of the metal, and metal-carbon bonds are formed. In fact, formation of the carbon-metal bonds causes a change in the electronic structure of the metal in a way that metal carbides can catalyze the reactions that usually are catalyzed by the noble metals. The effect of variation of the amount of nonmetal (carbon or oxygen) on the catalytic activity of metal carbides was investigated. The metal carbides are pyrophoric materials, and they need to be passivated before coming in contact with the ambient. The results show that water or CO₂ cannot passivate Mo₂C at low temperatures, and at high temperatures they damage the surface of metal carbides by removal of carbidic carbon. However, oxygen can passivate metal carbides at low temperatures. Passivation in 0.1%O₂/Ar instead of 1%O₂/Ar will cause generation of more active sites during reduction. The results revealed that increasing the amount of carbidic carbon or decrease of the amount of oxygen on the (sub) surface of metal carbides results in an increasing the hydrogenation activity. Also, there is a carbon dynamics (adding or removing carbon) on the surface of metal carbide which can alter the catalytic activity of metal carbides. Metal oxycarbides have bifunctional activity. The conversion of toluene was used to test the bifunctionality of metal (oxy) carbides. Mo₂C has strong metallic behavior and at 20 bar H₂ pressure and 400 °C, hydrogenation and hydrogenolysis products are predominant. In order to modify the metallic behavior of Mo₂C in favor of acid-catalyzed behavior, oxygen was introduced on the surface of Mo₂C to form molybdenum oxycarbide. However, oxygen can be removed at reaction conditions required for ring contraction of six-membered rings to five-membered rings. As a remedy, Mo₂C was mixed with another metal with a higher oxophilicity such as tungsten or niobium. The results indicate that molybdenum-tungsten carbides still have strong metallic behavior with predominant hydrogenation and hydrogenolysis products. However, molybdenum-niobium oxycarbides with cubic NbC structure have lower selectivity to hydrogenolysis products and higher selectivity to ring contraction products compared to Mo-Nb (oxy) carbides with hexagonal Mo₂C structure. The results show that at 400 °C and 20 bar H₂ pressure mixed metal carbides have better stability compared to their corresponding monometallic carbides. Advisors/Committee Members: Jentoft, Friederike (advisor), Jentoft, Rolf (committee member), Glatzhofer, Daniel (committee member), Resasco, Daniel (committee member), Lobban, Lance (committee member).

Subjects/Keywords: Engineering; Chemical.

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

APA (6^th Edition):

Mehdad, A. (2015). MIXED METAL CARBIDES: UNDERSTANDING THE SYNTHESIS, SURFACE PROPERTIES AND CATALYTIC ACTIVITIES. (Doctoral Dissertation). University of Oklahoma. Retrieved from http://hdl.handle.net/11244/15497

Chicago Manual of Style (16^th Edition):

Mehdad, Ali. “MIXED METAL CARBIDES: UNDERSTANDING THE SYNTHESIS, SURFACE PROPERTIES AND CATALYTIC ACTIVITIES.” 2015. Doctoral Dissertation, University of Oklahoma. Accessed March 07, 2021. http://hdl.handle.net/11244/15497.

MLA Handbook (7^th Edition):

Mehdad, Ali. “MIXED METAL CARBIDES: UNDERSTANDING THE SYNTHESIS, SURFACE PROPERTIES AND CATALYTIC ACTIVITIES.” 2015. Web. 07 Mar 2021.

Vancouver:

Mehdad A. MIXED METAL CARBIDES: UNDERSTANDING THE SYNTHESIS, SURFACE PROPERTIES AND CATALYTIC ACTIVITIES. [Internet] [Doctoral dissertation]. University of Oklahoma; 2015. [cited 2021 Mar 07]. Available from: http://hdl.handle.net/11244/15497.

Council of Science Editors:

Mehdad A. MIXED METAL CARBIDES: UNDERSTANDING THE SYNTHESIS, SURFACE PROPERTIES AND CATALYTIC ACTIVITIES. [Doctoral Dissertation]. University of Oklahoma; 2015. Available from: http://hdl.handle.net/11244/15497

University of Oklahoma

12. Hamon, Joshua Jacob. THE EFFECTS OF RANDOM AND CONTROLLED LATERAL CONFINEMENT ON SURFACTANT ADSORPTION.

Degree: PhD, 2018, University of Oklahoma

URL: http://hdl.handle.net/11244/301326

► Abstract The effects of temperature and surface roughness on the mass and viscoelasticity of an adsorbed surfactant layer were monitored using the quartz crystal microbalance… (more)

▼ Abstract The effects of temperature and surface roughness on the mass and viscoelasticity of an adsorbed surfactant layer were monitored using the quartz crystal microbalance with dissipation (QCM-D). Adsorption isotherms at 30, 40, 50 and 60C and at two different roughnesses on gold were measured for cetyltrimethylammonium bromide (CTAB). All isotherms displayed an increase in mass and dissipation as surfactant concentration was increased to its critical micelle concentration (CMC). Above the CMC adsorption reached a peak followed by a slight decrease to a plateau at the equilibrium adsorption value. As the temperature was increased the adsorbed mass above the CMC decreased. The adsorbed mass decreased further by increasing substrate roughness, while the dissipation remained statistically unchanged. Dynamic adsorption experiments were also conducted at various temperatures for select concentrations above and below the CMC, providing evidence of different adsorption mechanisms as a function of both surfactant concentration and surface roughness. Force curves collected using an atomic force microscope (AFM) in the presence of adsorbed surfactants are often used to draw conclusions about adsorbed film packing, rigidity and thickness. Force curves were collected from tetradecyltrimethylammonium bromide (TTAB) films adsorbed on highly ordered pyrolytic graphite (HOPG), silica, and silica that had been hydrophobized by functionalization with dichlorodimethyl silane. Break-through events in the force curves from several different trials were compared to show that the break-through distance, often reported as the adsorbed film thickness, increased with concentration below the critical micelle concentration (CMC) but was approximately 3.5 nm on all surfaces between 2× and 10× CMC; an unexpected result because of the different surface chemistries for the three surfaces. We employed an AFM probe with a different force constant (k) value as well as a colloidal probe and the break-through distance remained approximately 3.5 nm in all cases. Gradient mapping, a variant of force mapping, was also implemented on the three surfaces and resulted in a new technique for visualizing adsorbed surfactant in situ. The resulting maps showed patches of adsorbed surfactant below the CMC and revealed that with increasing concentration, the size of the patches increased resulting in full coverage near and above the CMC. These results are, to our knowledge, the first-time force mapping has been used to spatially track patches of adsorbed surfactant. Finally, layers of surfactants on an AFM tip were investigated by collecting a force map on a single AFM tip using the tip of a separate AFM probe. A break-through event was observed between the tips, indicating a layer of surfactant was present on at least one, if not both tips. Lastly, AFM force curves and nanoscale trenches and pillars were used to investigate the effects of lateral confinement on two cationic surfactants, TTAB and CPC. These laterally confined surfaces are model surfaces… Advisors/Committee Members: Grady, Brian (advisor), Harwell, Jeffrey (committee member), Lobban, Lance (committee member), O'Rear, Edgar (committee member), Sabatini, David (committee member).

Subjects/Keywords: Surface Roughness; Surfactant Adsorption; Atomic Force Microscopy; Quartz-Crystal Microbalance

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

APA (6^th Edition):

Hamon, J. J. (2018). THE EFFECTS OF RANDOM AND CONTROLLED LATERAL CONFINEMENT ON SURFACTANT ADSORPTION. (Doctoral Dissertation). University of Oklahoma. Retrieved from http://hdl.handle.net/11244/301326

Chicago Manual of Style (16^th Edition):

Hamon, Joshua Jacob. “THE EFFECTS OF RANDOM AND CONTROLLED LATERAL CONFINEMENT ON SURFACTANT ADSORPTION.” 2018. Doctoral Dissertation, University of Oklahoma. Accessed March 07, 2021. http://hdl.handle.net/11244/301326.

MLA Handbook (7^th Edition):

Hamon, Joshua Jacob. “THE EFFECTS OF RANDOM AND CONTROLLED LATERAL CONFINEMENT ON SURFACTANT ADSORPTION.” 2018. Web. 07 Mar 2021.

Vancouver:

Hamon JJ. THE EFFECTS OF RANDOM AND CONTROLLED LATERAL CONFINEMENT ON SURFACTANT ADSORPTION. [Internet] [Doctoral dissertation]. University of Oklahoma; 2018. [cited 2021 Mar 07]. Available from: http://hdl.handle.net/11244/301326.

Council of Science Editors:

Hamon JJ. THE EFFECTS OF RANDOM AND CONTROLLED LATERAL CONFINEMENT ON SURFACTANT ADSORPTION. [Doctoral Dissertation]. University of Oklahoma; 2018. Available from: http://hdl.handle.net/11244/301326

University of Oklahoma

13. Baker, Danielle Kimberly. CHARACTERIZATION OF POLYETHOXYLATED ALKYL PHENOLS WITH A HIGH DEGREE OF ETHOXYLATION AT THE SOLID-LIQUID INTERFACE.

Degree: PhD, 2016, University of Oklahoma

URL: http://hdl.handle.net/11244/34699

► Fully characterizing the behavior of a surfactant, from the mechanism of adsorption to the formation of micelles, is vital when taking the surfactant out of… (more)

▼ Fully characterizing the behavior of a surfactant, from the mechanism of adsorption to the formation of micelles, is vital when taking the surfactant out of the lab and into the real world. The critical micelle concentration, cloud point, and mechanism of adsorption are only a few aspects of a nonionic surfactant that must be understood. For nonionic surfactant solutions, the solution properties can change depending on the system temperature, salt concentration, salt type, etc. This dissertation focuses on the adsorption of high polyethoxylated alkyl phenols, more than 25 ethylene oxide units, on the hydrophilic silica surface and how environmental conditions affect the surfactant adsorption at the solid-liquid interface. The effects of ions of different salts on the adsorption densities and the shape of developed adsorption isotherms are related to the Hofmeister series. Depending on the ions present in solution, the maximum adsorption density is shown to increase or decrease in accordance with the Hofmeister series’s classification of ion as salting in or salting out. The salting out effect of sodium chloride causing an increase in adsorption density as well as a decrease in nonionic surfactant cloud points is examined as a fraction fluid, containing a high polyethoxylated alky phenol, travels through a packed ground shale or sand column. The effect of sodium chloride on a select few ionic surfactants traveling through the same packed ground shale or sand column is also analyzed. For the high polyethoxylated alky phenols, the formation of a coacervate hindered the surfactant migrating to the end of the column. For the ionic surfactants, the migration to the end of the packed column varied depending on the surfactant’s salt and temperature tolerance. Lastly, evidence is given with UV, quartz crystal microbalance, and ellipsometry analysis for a different mechanisms of adsorption for polyethoxylated alky phenols with a high degree of ethoxylation versus a low degree of ethoxylation. Advisors/Committee Members: Harwell, Jeffrey (advisor), Lobban, Lance (committee member), O'Rear, Edgar (committee member), Sabatini, David (committee member), Shiau, Benjamin (committee member).

Subjects/Keywords: Ethoxylated nonionic surfactant

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

APA (6^th Edition):

Baker, D. K. (2016). CHARACTERIZATION OF POLYETHOXYLATED ALKYL PHENOLS WITH A HIGH DEGREE OF ETHOXYLATION AT THE SOLID-LIQUID INTERFACE. (Doctoral Dissertation). University of Oklahoma. Retrieved from http://hdl.handle.net/11244/34699

Chicago Manual of Style (16^th Edition):

Baker, Danielle Kimberly. “CHARACTERIZATION OF POLYETHOXYLATED ALKYL PHENOLS WITH A HIGH DEGREE OF ETHOXYLATION AT THE SOLID-LIQUID INTERFACE.” 2016. Doctoral Dissertation, University of Oklahoma. Accessed March 07, 2021. http://hdl.handle.net/11244/34699.

MLA Handbook (7^th Edition):

Baker, Danielle Kimberly. “CHARACTERIZATION OF POLYETHOXYLATED ALKYL PHENOLS WITH A HIGH DEGREE OF ETHOXYLATION AT THE SOLID-LIQUID INTERFACE.” 2016. Web. 07 Mar 2021.

Vancouver:

Baker DK. CHARACTERIZATION OF POLYETHOXYLATED ALKYL PHENOLS WITH A HIGH DEGREE OF ETHOXYLATION AT THE SOLID-LIQUID INTERFACE. [Internet] [Doctoral dissertation]. University of Oklahoma; 2016. [cited 2021 Mar 07]. Available from: http://hdl.handle.net/11244/34699.

Council of Science Editors:

Baker DK. CHARACTERIZATION OF POLYETHOXYLATED ALKYL PHENOLS WITH A HIGH DEGREE OF ETHOXYLATION AT THE SOLID-LIQUID INTERFACE. [Doctoral Dissertation]. University of Oklahoma; 2016. Available from: http://hdl.handle.net/11244/34699

University of Oklahoma

14. Heck, Margaret. Investigation of Flow through Complicated Microfluidic Devices and over Micropatterned Surfaces using Computational Fluid Dynamics.

Degree: PhD, 2015, University of Oklahoma

URL: http://hdl.handle.net/11244/32571

► Computational fluid dynamics is used to study two distinct areas of engineering interest: microfluidic systems involving superhydrophobic surfaces and blood pumps. Superhydrophobic surfaces, which can… (more)

Subjects/Keywords: Computational fluid dynamics; microfluidics; blood pump

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APA (6^th Edition):

Heck, M. (2015). Investigation of Flow through Complicated Microfluidic Devices and over Micropatterned Surfaces using Computational Fluid Dynamics. (Doctoral Dissertation). University of Oklahoma. Retrieved from http://hdl.handle.net/11244/32571

Chicago Manual of Style (16^th Edition):

Heck, Margaret. “Investigation of Flow through Complicated Microfluidic Devices and over Micropatterned Surfaces using Computational Fluid Dynamics.” 2015. Doctoral Dissertation, University of Oklahoma. Accessed March 07, 2021. http://hdl.handle.net/11244/32571.

MLA Handbook (7^th Edition):

Heck, Margaret. “Investigation of Flow through Complicated Microfluidic Devices and over Micropatterned Surfaces using Computational Fluid Dynamics.” 2015. Web. 07 Mar 2021.

Vancouver:

Heck M. Investigation of Flow through Complicated Microfluidic Devices and over Micropatterned Surfaces using Computational Fluid Dynamics. [Internet] [Doctoral dissertation]. University of Oklahoma; 2015. [cited 2021 Mar 07]. Available from: http://hdl.handle.net/11244/32571.

Council of Science Editors:

Heck M. Investigation of Flow through Complicated Microfluidic Devices and over Micropatterned Surfaces using Computational Fluid Dynamics. [Doctoral Dissertation]. University of Oklahoma; 2015. Available from: http://hdl.handle.net/11244/32571

University of Oklahoma

15. Nie, Lei. Catalytic Hydrodeoxygenation of Phenolic Compounds of Importance in Bio-oil Upgrading.

Degree: PhD, 2014, University of Oklahoma

URL: http://hdl.handle.net/11244/10369

► Economic and environmental concerns including the increasing energy consumption and demand, ensuring energy security, reducing green-house gas emission and producing cleaner energy have caused tremendous… (more)

▼ Economic and environmental concerns including the increasing energy consumption and demand, ensuring energy security, reducing green-house gas emission and producing cleaner energy have caused tremendous interest in research and development on use of renewable energy resources such as biomass. Fast pyrolysis has proven to be a cost efficient method to convert biomass to liquid bio-oil which could be further upgraded to blend with conventional transportation fuels. Since the high oxygen content in fast pyrolysis bio-oil has brought bad properties such as instability during storage and transportation and low heating value. Hydrodeoxygenation (Hydrotreating), a refinery hydroprocessing technology, is cited to be an efficient technology to remove the excess oxygen in bio-oil. Moreover, during the process, the retention carbon in the bio-oil liquid as well as reduction of the hydrogen consumption is other important issue to investigate. Thus in the scope of this dissertation, a detailed study of the reaction kinetics and the mechanism of hydrodeoxygenation of phenolic compounds in fast pyrolysis bio-oil is presented. Also the understanding of the fundamental catalytic chemistry will be applied to tailor catalyst formulations to convert the model phenolics in bio-oil to higher value hydrocarbon products. In this dissertation, a tautomerization reaction pathway for the hydrodeoyxgenation of m-cresol (a model phenolic compound in bio-oil) is proven, which has not been previously proposed in any previous literature. The tautomerization path starts with the tautomerization of m-cresol to an unstable ketone intermediate (3-methyl-3,5-cyclohexadienone). The fate of this intermediate is determined by the ability of the catalyst to either hydrogenate the carbonyl group or the ring. The former would be preferred over catalysts with oxophilic sites (Ni-Fe/SiO2, Pt/TiO2), while the latter would mostly occur over catalysts with a pure metallic function (Pt/SiO2, Ni/SiO2). Hydrogenation of the carbonyl group produces a very reactive unsaturated alcohol (3-methyl-3,5-cyclohexadienol), which can be easily dehydrated to toluene. This dehydration step is driven by the formation of aromaticity. Thus, strong acid site is not required. By contrast, hydrogenation of the ring would result in 3-methylcyclohexanone, which can be further hydrogenated to 3-methylcyclohexanol. On supports that contain strong acid sites, which are active for dehydration of the corresponding alcohol, the formation of toluene would occur via dehydration of the alcohol and subsequent dehydrogenation. On the catalysts and conditions investigated in this dissertation, dehydration of the corresponding alcohol does not occur due to low acidity of the supports (SiO2, TiO2 etc.), so the only path to toluene is via hydrogenation of the carbonyl of the unstable ketone intermediate. Catalysts formulation can be tailored by introducing oxophilic sites either by incorporating bimetallic catalysts or the metal support interaction. Oxophilic sites help improve… Advisors/Committee Members: Resasco, Daniel (advisor), Mallinson, Richard (committee member), Lobban, Lance (committee member), Crossley, Steven (committee member), Nicholas, Kenneth (committee member).

Subjects/Keywords: Engineering; Chemical.

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

APA (6^th Edition):

Nie, L. (2014). Catalytic Hydrodeoxygenation of Phenolic Compounds of Importance in Bio-oil Upgrading. (Doctoral Dissertation). University of Oklahoma. Retrieved from http://hdl.handle.net/11244/10369

Chicago Manual of Style (16^th Edition):

Nie, Lei. “Catalytic Hydrodeoxygenation of Phenolic Compounds of Importance in Bio-oil Upgrading.” 2014. Doctoral Dissertation, University of Oklahoma. Accessed March 07, 2021. http://hdl.handle.net/11244/10369.

MLA Handbook (7^th Edition):

Nie, Lei. “Catalytic Hydrodeoxygenation of Phenolic Compounds of Importance in Bio-oil Upgrading.” 2014. Web. 07 Mar 2021.

Vancouver:

Nie L. Catalytic Hydrodeoxygenation of Phenolic Compounds of Importance in Bio-oil Upgrading. [Internet] [Doctoral dissertation]. University of Oklahoma; 2014. [cited 2021 Mar 07]. Available from: http://hdl.handle.net/11244/10369.

Council of Science Editors:

Nie L. Catalytic Hydrodeoxygenation of Phenolic Compounds of Importance in Bio-oil Upgrading. [Doctoral Dissertation]. University of Oklahoma; 2014. Available from: http://hdl.handle.net/11244/10369

University of Oklahoma

16. Zhao, Zheng. Kinetics and Solvent Effects on Supported Metal Catalysts for Biomass Conversion.

Degree: PhD, 2018, University of Oklahoma

URL: http://hdl.handle.net/11244/316275

► Energy conversion using renewable biomass has significant environmental impact. To acquire high value products using preliminary processed biomass, considerable amount of upgrading reactions has been… (more)

▼ Energy conversion using renewable biomass has significant environmental impact. To acquire high value products using preliminary processed biomass, considerable amount of upgrading reactions has been conducted in liquid-phase conditions. Addition of solvents could interact with all component within reaction system. In order to influence heterogeneous catalytic reactions, solvents have to affect the kinetically relevant steps such as adsorption, surface reaction, and desorption. The following chapters investigate kinetics and solvent effects for biomass conversion. In Chapter 4, cyclohexene hydrogenation has been carried out over 0.25 wt.% Pd/α-Al2O3 in heptane, methylcyclohexane and decalin with a wide range of reaction conditions, from 30 psi to 600 psi of hydrogen pressure under 40 °C – 100 °C. Those inert solvents demonstrate competitive adsorption with reactants cyclohexene and lead to its decrease in surface coverage. Decalin competes the strongest and results the lowest hydrogenation rate followed by methylcyclohexane and then heptane. Heptane illustrates negligible surface competitive adsorption. Additionally, the non-ideality of reaction mixtures also alters the surface concentration of the solvent molecules compared to the bulk phase. Four kinetic models have been established based on different surface scenarios, and the cyclohexene hydrogenation has been found to be the first hydrogenation as the rate-determining step with cyclohexene and hydrogen absorbed on different Pd sites. Combined with statistical thermodynamic analysis, surface cyclohexene and hydrogen retain a certain amount of entropy based on their degree of freedom(DOF) of translation, rotation and vibration modes. ∆Sads for cyclohexene is -143 ± 19 J/mol·K, which loses around 2/3 of total entropy of its liquid state. Hydrogen losses more entropy upon adsorption and ∆Sads is -108 ± 12 J/mol·K. Meanwhile, heat of adsorption decreases with surface coverage. ∆Hads for cyclohexene on a clean Pd surface is -75 ± 14 kJ/mol, while the ∆Hads for hydrogen is -41 ± 7 kJ/mol. On a fully covered Pd surface, ∆Hads for cyclohexene becomes -53 kJ/mol, while ∆Hads for hydrogen reduces to -33 kJ/mol. In Chapter 5, the protic solvent, water, participates in the kinetically relevant step, surface reaction step, and influences the reaction rate and product distributions. Furfural hydrogenation in cyclohexane and water over 3% Pd/α-Al2O3 presents distinctive reactivity and product distribution. In the presence of water, hydrogenation of the carbonyl group of furfural is favored and therefore furfuryl alcohol is the main product. While the furanyl ring hydrogenation is favored in solvent cyclohexane and the reactivity in cyclohexane is much less. DFT calculations demonstrate that water stabilizes the intermediate and final product significantly by forming hydrogen bonds and provides an alternative hydrogenation pathway through water H-shuttling mechanism. Water-assist hydrogenation decreases the overall energy at the transition state from 46 kJ/mol to -7… Advisors/Committee Members: Resasco, Daniel (advisor), Sabatini, David (committee member), Wang, Bin (committee member), Crossley, Steven (committee member), Lobban, Lance (committee member).

Subjects/Keywords: hydrogenation; particle size effect; aqueous phase reforming; entropy of adsorption; solvent effect; heterogeneous catalysis; non-ideal; kinetic model

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

APA (6^th Edition):

Zhao, Z. (2018). Kinetics and Solvent Effects on Supported Metal Catalysts for Biomass Conversion. (Doctoral Dissertation). University of Oklahoma. Retrieved from http://hdl.handle.net/11244/316275

Chicago Manual of Style (16^th Edition):

Zhao, Zheng. “Kinetics and Solvent Effects on Supported Metal Catalysts for Biomass Conversion.” 2018. Doctoral Dissertation, University of Oklahoma. Accessed March 07, 2021. http://hdl.handle.net/11244/316275.

MLA Handbook (7^th Edition):

Zhao, Zheng. “Kinetics and Solvent Effects on Supported Metal Catalysts for Biomass Conversion.” 2018. Web. 07 Mar 2021.

Vancouver:

Zhao Z. Kinetics and Solvent Effects on Supported Metal Catalysts for Biomass Conversion. [Internet] [Doctoral dissertation]. University of Oklahoma; 2018. [cited 2021 Mar 07]. Available from: http://hdl.handle.net/11244/316275.

Council of Science Editors:

Zhao Z. Kinetics and Solvent Effects on Supported Metal Catalysts for Biomass Conversion. [Doctoral Dissertation]. University of Oklahoma; 2018. Available from: http://hdl.handle.net/11244/316275

University of Oklahoma

17. Bertsche, Carolyn. Measurement of the Top Quark Pole Mass and QCD Radiation in Top Quark Pair Production using Electron-Muon Events with b-Tagged Jets in Proton-Proton Collisions at 7-8 TeV with the ATLAS Detector at the LHC.

Degree: PhD, 2015, University of Oklahoma

URL: http://hdl.handle.net/11244/23322

► As heavy as an atom of gold but much smaller than a proton, the top quark is the most massive fundamental particle known in the… (more)

▼ As heavy as an atom of gold but much smaller than a proton, the top quark is the most massive fundamental particle known in the universe and an integral part of current particle physics research. The characteristics of the top quark, such as its high mass—close to the scale of electroweak symmetry breaking—and its dominance in the running of the recently discovered Higgs boson’s self-coupling, make the top quark a cornerstone of current research. Studies of the top quark are probes of new physics, essential tools to understand the Higgs boson, and valuable tests of the Standard Model. This thesis presents two measurements of top quark pair production events collected with the ATLAS Detector at the CERN Large Hadron Collider (LHC) in proton-proton collisions at a center-of-mass energy 7-8 TeV. Both measurements select top-antitop quark events with an opposite-sign electron-muon pair and one or two b-tagged jets in the final state. A study is first presented of the jet activity arising from quark and gluon radiation produced in association with top quark pairs, in events with an opposite-sign electron-muon pair as well as at least two b-tagged jets in the final state. It includes the complete 2012 ATLAS data sample of 20.3 fb-1 integrated luminosity of proton-proton collision data at 8 TeV. The fraction of events that does not contain additional jet activity in a central rapidity region is measured as a function of a) the minimum transverse momentum of any additional jet in the event, and b) the minimum scalar transverse momentum sum of all additional jets in the event, and the results given for four central rapidity regions and four regions of the invariant mass of the electron, muon and two b-jet system. Compensation for detector effects is applied to the experimental measurement and the results compared at the particle level to simulations by several next-to-leading order (NLO) and leading order (LO) Monte Carlo generators. The resulting gap fraction measurements, in comparison with simulation, can be used to tune Monte Carlo modeling of quantum chromodynamic (QCD) radiation and reduce associated modeling uncertainties in ATLAS physics measurements involving top quark pair production, such as top quark measurements and Higgs boson measurements with top quark backgrounds. Secondly, the top quark pole mass (mpole) was extracted from top quark pair top events having an opposite-sign electron-muon pair in the final state and one or two b-tagged jets. This measurement includes the complete 2012 ATLAS data sample, as well as the complete 2011 ATLAS data sample of 4.6 fb-1 integrated luminosity of proton-proton collision data at 7 TeV. This is combined with the theoretical cross section prediction including QCD corrections at next-to-next-to-leading order (NNLO+NNLL), with three different sets of parton distribution functions. The results are: top quark pole mass (7 TeV) = 171.40+2.58-2.56 GeV top quark pole mass (8 TeV) = 174.10 ± 2.64 GeV top quark pole mass (7-8 TeV) = 172.87+2.51-2.63 GeV in which the… Advisors/Committee Members: Strauss, Michael (advisor), Abbott, Braden (committee member), Kao, Chung (committee member), Murphy, Sheena (committee member), Lobban, Lance (committee member).

Subjects/Keywords: physics; high-energy experimental physics; particle physics; top quark physics

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APA (6^th Edition):

Bertsche, C. (2015). Measurement of the Top Quark Pole Mass and QCD Radiation in Top Quark Pair Production using Electron-Muon Events with b-Tagged Jets in Proton-Proton Collisions at 7-8 TeV with the ATLAS Detector at the LHC. (Doctoral Dissertation). University of Oklahoma. Retrieved from http://hdl.handle.net/11244/23322

Chicago Manual of Style (16^th Edition):

Bertsche, Carolyn. “Measurement of the Top Quark Pole Mass and QCD Radiation in Top Quark Pair Production using Electron-Muon Events with b-Tagged Jets in Proton-Proton Collisions at 7-8 TeV with the ATLAS Detector at the LHC.” 2015. Doctoral Dissertation, University of Oklahoma. Accessed March 07, 2021. http://hdl.handle.net/11244/23322.

MLA Handbook (7^th Edition):

Bertsche, Carolyn. “Measurement of the Top Quark Pole Mass and QCD Radiation in Top Quark Pair Production using Electron-Muon Events with b-Tagged Jets in Proton-Proton Collisions at 7-8 TeV with the ATLAS Detector at the LHC.” 2015. Web. 07 Mar 2021.

Vancouver:

Bertsche C. Measurement of the Top Quark Pole Mass and QCD Radiation in Top Quark Pair Production using Electron-Muon Events with b-Tagged Jets in Proton-Proton Collisions at 7-8 TeV with the ATLAS Detector at the LHC. [Internet] [Doctoral dissertation]. University of Oklahoma; 2015. [cited 2021 Mar 07]. Available from: http://hdl.handle.net/11244/23322.

Council of Science Editors:

Bertsche C. Measurement of the Top Quark Pole Mass and QCD Radiation in Top Quark Pair Production using Electron-Muon Events with b-Tagged Jets in Proton-Proton Collisions at 7-8 TeV with the ATLAS Detector at the LHC. [Doctoral Dissertation]. University of Oklahoma; 2015. Available from: http://hdl.handle.net/11244/23322

University of Oklahoma

18. Omotoso, Taiwo. CONVERSION OF MODEL BIO-OIL COMPOUNDS OVER METAL OXIDES AND SUPPORTED METAL CATALYSTS.

Degree: PhD, 2015, University of Oklahoma

URL: http://hdl.handle.net/11244/23318

► Growing environmental concerns has necessitated the development of cleaner and renewable sources of energy such as biomass. Bio-oil derived from lignocellulosic biomass is a promising… (more)

▼ Growing environmental concerns has necessitated the development of cleaner and renewable sources of energy such as biomass. Bio-oil derived from lignocellulosic biomass is a promising source for producing renewable chemicals and fuels, however due to the instability of this complex mixture, with its high oxygen content contributing mainly to this, catalytic upgrading is required to improve on undesirable properties. Therefore not only is it necessary to decrease the oxygen content of bio-oil, a good upgrading strategy should preserve valuable carbon in the liquid. Metals supported on reducible oxides hold considerable promise for upgrading pyrolysis vapors, as they are capable of converting corrosive light compounds such as acetic acid to the chemical building block acetone as well as catalyzing the deoxygenation and transalkylation of larger phenolic compounds to produce alkyl-aromatics. The combination of reducible oxides such as TiO2 coupled with metals such as Ru can result in a complex catalyst. Potential active sites include the sites on the metal surface, the highly reducible sites at the Ru/TiO2 interface, traditional acid sites on the TiO2 surface, and defects on the TiO2 support. While the roles of the various types of active sites for Ru/TiO2 catalysts have been studied in detail for reactions such as Fischer Tropsch synthesis, little is known regarding the role of these active sites for the conversion of lignin-derived phenolic compounds. In this dissertation, the author will use a combination of model compound studies coupled with catalyst modifications to better understand the reactivity of the various phenolic functional groups and also furfural, an important compound derived from the sugar fraction of biomass feed stocks, over the active sites present on Ru/TiO2 . In the first section of this dissertation, the role of TiO2 crystal morphology phase – anatase and rutile- on resistance to Ru agglomeration during different catalyst pre-treatment conditions and the impact on the conversion of guaiacol, a phenolic compound with both methoxy and hydroxyl functions is investigated. The superior ability of the rutile TiO2 phase in stabilizing ruthenium particles compared to anatase was investigated. This is essential to designing Ru catalysts that have enhanced stability during high temperature oxidation treatments. These chapters will also give insights into the nature of active sites on the Ru/TiO2 catalyst responsible for guaiacol deoxygenation. Differentiation between Ru/TiO2 interfacial sites and oxygen vacancies on the TiO2 support for the conversion of guaiacol was achieved. In other chapters, the conversion of important phenolic compounds such as anisole, catechol and m-cresol was addressed. By utilizing a series of Ru catalysts with varying support types (SiO2, C, TiO2); TiO2 support phase (anatase, rutile and a mixture of both phases) and Ru particle sizes, the role of the various sites on the Ru/TiO2 catalyst for the conversion of these compounds was elucidated. These chapters demonstrate that… Advisors/Committee Members: Crossley, Steven (advisor), White, Robert (committee member), Resasco, Daniel (committee member), Lobban, Lance (committee member), Wang, Bin (committee member).

Subjects/Keywords: Catalysis; Biofuels; Ruthenium; Titania

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APA (6^th Edition):

Omotoso, T. (2015). CONVERSION OF MODEL BIO-OIL COMPOUNDS OVER METAL OXIDES AND SUPPORTED METAL CATALYSTS. (Doctoral Dissertation). University of Oklahoma. Retrieved from http://hdl.handle.net/11244/23318

Chicago Manual of Style (16^th Edition):

Omotoso, Taiwo. “CONVERSION OF MODEL BIO-OIL COMPOUNDS OVER METAL OXIDES AND SUPPORTED METAL CATALYSTS.” 2015. Doctoral Dissertation, University of Oklahoma. Accessed March 07, 2021. http://hdl.handle.net/11244/23318.

MLA Handbook (7^th Edition):

Omotoso, Taiwo. “CONVERSION OF MODEL BIO-OIL COMPOUNDS OVER METAL OXIDES AND SUPPORTED METAL CATALYSTS.” 2015. Web. 07 Mar 2021.

Vancouver:

Omotoso T. CONVERSION OF MODEL BIO-OIL COMPOUNDS OVER METAL OXIDES AND SUPPORTED METAL CATALYSTS. [Internet] [Doctoral dissertation]. University of Oklahoma; 2015. [cited 2021 Mar 07]. Available from: http://hdl.handle.net/11244/23318.

Council of Science Editors:

Omotoso T. CONVERSION OF MODEL BIO-OIL COMPOUNDS OVER METAL OXIDES AND SUPPORTED METAL CATALYSTS. [Doctoral Dissertation]. University of Oklahoma; 2015. Available from: http://hdl.handle.net/11244/23318

University of Oklahoma

19. Attaphong, Chodchanok. FORMULATIONS AND CHARACTERISTICS OF VEGETABLE OIL-BASED MICROEMULSION BIOFUELS.

Degree: PhD, 2014, University of Oklahoma

URL: http://hdl.handle.net/11244/8108

► Biofuels have been increasingly explored as alternative renewable fuel sources due to the growing global energy demand, petroleum-based fuel depletion, and the negative effects of… (more)

▼ Biofuels have been increasingly explored as alternative renewable fuel sources due to the growing global energy demand, petroleum-based fuel depletion, and the negative effects of global exhaust emissions from fossil fuels. There has been a large amount of research on biofuel technologies and development in recent years. Among all types of liquid biofuels, vegetable oils and bio-alcohols have become of special interest since they can be utilized in engines with and/or without modification. Nonetheless, the limitations of their use are the long-term operation problems from high viscosity of vegetable oils and low energy content of bio-alcohols. Transesterification is the most common method to reduce the viscosity of vegetable oils through the chemical reactions with methanol and/or ethanol. Although biodiesel, the product from this process which is also considered as a biofuel, has comparable fuel properties to No.2 diesel, it has cold weather limitations, generates high nitrogen oxide levels in the exhaust gases of some engines, and produces unpurified glycerol as co-product causing disposal problems. Therefore, vegetable oil-based microemulsification has been proposed as a method to reduce the vegetable oil viscosity using low viscous alcohols while eliminating the chemical reaction and avoiding the unpurified glycerol. In addition, vegetable oil-based microemulsion can overcome the immiscibility between alcohol and oil phases. Microemulsions are thermodynamically stable mixtures of water and oil stabilized by surfactant and/or cosurfactants. Owing to their ultralow interfacial tension and high solubilization capacity, microemulsions are enviable for various applications such as food, cosmetic and pharmaceutical, enhanced oil recovery, and biofuel applications. Microemulsion fuels are transparent, single-phase, and thermodynamically stable mixtures where the polar phase is solubilized in reverse micelles occurring in the non-polar phase stabilized by surfactants. In this dissertation, vegetable oil-based microemulsion fuels have been developed and the effects of ambient temperature, surfactants, cosurfactants, alcohols, vegetable oils, and additives on phase behavior have been evaluated. Next, pollutant emission characteristics of products generated by their combustion (soot, CO, and NOx) and fuel properties (i.e., viscosities, and cold flow properties) of selected microemulsion fuel systems on have been evaluated. This work showed that various formulations of vegetable oil-based microemulsion fuels have comparable fuel properties to canola biodiesel, achieve the ASTM standards of No.2 diesel, and produce more favorable pollutant emissions than canola biodiesel and No.2 diesel. Moreover, the ability to achieve temperature robustness was demonstrated for particular cases depending on user considerations (e.g., sustainable, environment-benign, and/or cost-effective considerations). Most importantly, this dissertation provides useful results for further design and development of microemulsion fuels as potential… Advisors/Committee Members: Sabatini, David A. (advisor), Butler, Elizabeth C. (committee member), Lobban, Lance L. (committee member), Gollahalli, Subramanyam R. (committee member), Kibbey, Tohren C. (committee member).

Subjects/Keywords: Engineering; Environmental.

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

APA (6^th Edition):

Attaphong, C. (2014). FORMULATIONS AND CHARACTERISTICS OF VEGETABLE OIL-BASED MICROEMULSION BIOFUELS. (Doctoral Dissertation). University of Oklahoma. Retrieved from http://hdl.handle.net/11244/8108

Chicago Manual of Style (16^th Edition):

Attaphong, Chodchanok. “FORMULATIONS AND CHARACTERISTICS OF VEGETABLE OIL-BASED MICROEMULSION BIOFUELS.” 2014. Doctoral Dissertation, University of Oklahoma. Accessed March 07, 2021. http://hdl.handle.net/11244/8108.

MLA Handbook (7^th Edition):

Attaphong, Chodchanok. “FORMULATIONS AND CHARACTERISTICS OF VEGETABLE OIL-BASED MICROEMULSION BIOFUELS.” 2014. Web. 07 Mar 2021.

Vancouver:

Attaphong C. FORMULATIONS AND CHARACTERISTICS OF VEGETABLE OIL-BASED MICROEMULSION BIOFUELS. [Internet] [Doctoral dissertation]. University of Oklahoma; 2014. [cited 2021 Mar 07]. Available from: http://hdl.handle.net/11244/8108.

Council of Science Editors:

Attaphong C. FORMULATIONS AND CHARACTERISTICS OF VEGETABLE OIL-BASED MICROEMULSION BIOFUELS. [Doctoral Dissertation]. University of Oklahoma; 2014. Available from: http://hdl.handle.net/11244/8108

University of Oklahoma

20. Budhathoki, Mahesh. SURFACTANT-ONLY EOR FOR HIGH SALINITY BRINE.

Degree: PhD, 2015, University of Oklahoma

URL: http://hdl.handle.net/11244/15503

► Developing a surfactant formulation for reservoir having high salinity/total dissolved solids (TDS) brine is a challenging task because surfactant not only phase separate or precipitate… (more)

▼ Developing a surfactant formulation for reservoir having high salinity/total dissolved solids (TDS) brine is a challenging task because surfactant not only phase separate or precipitate but also show high adsorption on reservoir rocks under such condition. These issues pose major threat on technological and economic viability of surfactant based chemical enhanced oil recovery (cEOR) technique. Therefore, this study attempts to overcome such challenges by investigating the feasibility of an alcohol free binary mixtures of sodium alkyl alkoxy sulfate surfactants and a sodium alkyl ethoxy sulfate surfactant for reservoir brine having a TDS of 301,710 mg/l with total hardness of 12,973 mg/l. The optimized surfactant formulations show excellent aqueous phase stability, produce an ultra-low-interfacial tension (IFT) of 0.004 mN/m, and give fast coalescence rates of less than 30 minutes at reservoir conditions. Accuracy of the hydrophilic lipophilic deviation (HLD) method in predicting the ratio between two surfactants to give optimal Type III microemulsion is also studied. Results show that correct determination of surfactant’s head constant, K, and temperature constant, αT, determines the accuracy of the HLD method. This study also demonstrates the field feasibility of the proposed surfactant formulation. Sand pack studies are performed in laboratory in order to optimize surfactant-only slug for field test. Single well tracer tests (SWTTs) are conducted before and after surfactant injection to assess the oil mobilization efficiency of laboratory optimized formulation at the field. Numerical simulation method is further applied to interpret field data. The results show approximately 73% reduction of residual oil saturation (Sor) demonstrating the efficacy of lab optimized surfactant-only flood system in ultra-high TDS reservoir. Furthermore, this work investigates the efficacy of polyelectrolyte, polystyrene sulfonate (PSS), as a sacrificial agent for lowering surfactant adsorption at reservoir conditions. Four different molecular weight PSSs are evaluated through equilibrium and dynamic adsorption studies carried out on Brea sandstone and Ottawa sand. Results show significant reduction in surfactant adsorption after PSSs addition. Moreover, the sand pack studies are conducted to evaluate the effect of PSS minimized surfactant adsorption on oil mobilization/recovery. Results indicate improved oil recovery in the presence of PSS suggesting its potential future as sacrificial agent in cEOR. Advisors/Committee Members: Harwell, Jeffrey (advisor), Shiau, Bor-Jier (Ben) (committee member), Jamili, Ahmad (committee member), O' Rear III, Edgar (committee member), Lobban, Lance L. (committee member).

Subjects/Keywords: Microemulsion; Enhanced Oil Recovery; Surfactant; Hydrophilic Lipophilic Deviation (HLD); High Salinity; Surfactant Adsorption; Sacrificial Agent

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

APA (6^th Edition):

Budhathoki, M. (2015). SURFACTANT-ONLY EOR FOR HIGH SALINITY BRINE. (Doctoral Dissertation). University of Oklahoma. Retrieved from http://hdl.handle.net/11244/15503

Chicago Manual of Style (16^th Edition):

Budhathoki, Mahesh. “SURFACTANT-ONLY EOR FOR HIGH SALINITY BRINE.” 2015. Doctoral Dissertation, University of Oklahoma. Accessed March 07, 2021. http://hdl.handle.net/11244/15503.

MLA Handbook (7^th Edition):

Budhathoki, Mahesh. “SURFACTANT-ONLY EOR FOR HIGH SALINITY BRINE.” 2015. Web. 07 Mar 2021.

Vancouver:

Budhathoki M. SURFACTANT-ONLY EOR FOR HIGH SALINITY BRINE. [Internet] [Doctoral dissertation]. University of Oklahoma; 2015. [cited 2021 Mar 07]. Available from: http://hdl.handle.net/11244/15503.

Council of Science Editors:

Budhathoki M. SURFACTANT-ONLY EOR FOR HIGH SALINITY BRINE. [Doctoral Dissertation]. University of Oklahoma; 2015. Available from: http://hdl.handle.net/11244/15503

University of Oklahoma

21. Gordon, Christopher L. Non-oxidative conversion of methane in a DC plasma reactor.

Degree: PhD, School of Chemical, Biological and Materials Engineering, 2004, University of Oklahoma

URL: http://hdl.handle.net/11244/758

► The dc plasma system utilizes a particle bed to assist in the stabilization of the discharge. Without the bed present, the breakdown voltage is much… (more)

Subjects/Keywords: Engineering, Chemical.; Engineering, Electronics and Electrical.; Low temperature plasmas.; Methane.; Engineering, Petroleum.; Acetylene.; Ethylene.

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

APA (6^th Edition):

Gordon, C. L. (2004). Non-oxidative conversion of methane in a DC plasma reactor. (Doctoral Dissertation). University of Oklahoma. Retrieved from http://hdl.handle.net/11244/758

Chicago Manual of Style (16^th Edition):

Gordon, Christopher L. “Non-oxidative conversion of methane in a DC plasma reactor.” 2004. Doctoral Dissertation, University of Oklahoma. Accessed March 07, 2021. http://hdl.handle.net/11244/758.

MLA Handbook (7^th Edition):

Gordon, Christopher L. “Non-oxidative conversion of methane in a DC plasma reactor.” 2004. Web. 07 Mar 2021.

Vancouver:

Gordon CL. Non-oxidative conversion of methane in a DC plasma reactor. [Internet] [Doctoral dissertation]. University of Oklahoma; 2004. [cited 2021 Mar 07]. Available from: http://hdl.handle.net/11244/758.

Council of Science Editors:

Gordon CL. Non-oxidative conversion of methane in a DC plasma reactor. [Doctoral Dissertation]. University of Oklahoma; 2004. Available from: http://hdl.handle.net/11244/758

University of Oklahoma

22. Dreyer, Martina Irmgard. Titanium dioxide aerogels as photocatalysts for indoor air decontamination.

Degree: PhD, School of Chemical, Biological and Materials Engineering, 2002, University of Oklahoma

URL: http://hdl.handle.net/11244/430

The aerogels' activity was further enhanced by thermal treatment and by the deposition of platinum. A platinum content of 1.2wt% increased the ethylene oxidation reaction rate constant by 35% for the Degussa P25 and by 11% for the aerogel T36. Advisors/Committee Members: Lobban, Lance L., (advisor).

Subjects/Keywords: Engineering, Chemical.; Indoor air pollution.; Titanium dioxide.; Aerogels.; Engineering, Civil.

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

APA (6^th Edition):

Dreyer, M. I. (2002). Titanium dioxide aerogels as photocatalysts for indoor air decontamination. (Doctoral Dissertation). University of Oklahoma. Retrieved from http://hdl.handle.net/11244/430

Chicago Manual of Style (16^th Edition):

Dreyer, Martina Irmgard. “Titanium dioxide aerogels as photocatalysts for indoor air decontamination.” 2002. Doctoral Dissertation, University of Oklahoma. Accessed March 07, 2021. http://hdl.handle.net/11244/430.

MLA Handbook (7^th Edition):

Dreyer, Martina Irmgard. “Titanium dioxide aerogels as photocatalysts for indoor air decontamination.” 2002. Web. 07 Mar 2021.

Vancouver:

Dreyer MI. Titanium dioxide aerogels as photocatalysts for indoor air decontamination. [Internet] [Doctoral dissertation]. University of Oklahoma; 2002. [cited 2021 Mar 07]. Available from: http://hdl.handle.net/11244/430.

Council of Science Editors:

Dreyer MI. Titanium dioxide aerogels as photocatalysts for indoor air decontamination. [Doctoral Dissertation]. University of Oklahoma; 2002. Available from: http://hdl.handle.net/11244/430

Open Access Theses and Dissertations