Advanced search options

Advanced Search Options 🞨

Browse by author name (“Author name starts with…”).

Find ETDs with:

in
/  
in
/  
in
/  
in

Written in Published in Earliest date Latest date

Sorted by

Results per page:

Sorted by: relevance · author · university · dateNew search

You searched for subject:(Tetraline). Showing records 1 – 3 of 3 total matches.

Search Limiters

Last 2 Years | English Only

No search limiters apply to these results.

▼ Search Limiters


Universidade do Estado do Rio de Janeiro

1. Sheila Guimarães de Almeida Ferraz. A influência da acidez do suporte de catalisadores Ni-Mo sobre a atividade da reação de hidrogenação de aromáticos e abertura de ciclo naftênico.

Degree: Master, 2008, Universidade do Estado do Rio de Janeiro

Três catalisadores contendo o mesmo teor de fase ativa (20% de óxido de molibdênio e 4% de óxido de níquel), mas constituídos por diferentes suportes (alumina, sílica-alumina e alumina zeólita) foram preparados com o objetivo de se obter catalisadores bifuncionais com acidez distinta e boa dispersão da fase metálica visando analisar o papel da acidez do suporte na conversão da tetralina. Os catalisadores e seus respectivos suportes foram caracterizados na formas óxido e sulfeto e avaliados na reação de hidrogenação da tetralina, que representa bem os monoaromáticos presentes nas correntes de petróleo. A caracterização textural mostrou que tanto a área específica quanto o volume de poros foram pouco alterados após a incorporação dos óxidos metálicos aos suportes. Os catalisadores apresentaram uma dispersão relativamente boa da fase ativa, conforme indicado pelos resultados de MET, DRX e DRS. Os resultados obtidos por TPD de n-propilamina e por espectroscopia de IV de piridina mostraram que a incorporação de óxidos de molibdênio e níquel levou a um aumento da acidez de Brönsted, o que foi atribuído à criação de novos sítios ácidos associados ao óxido de molibdênio ou a sítios de interface deste com o suporte. Obteve-se uma boa correlação entre a atividade de conversão da tetralina e o rendimento em produtos aromáticos e abertura de ciclo naftênico com a acidez de Brönsted do suporte, com a seguinte ordem de atividade para a conversão da tetralina: NiMo/alumina < NiMo/sílica-alumina < NiMo/alumina zeólita. O aumento do rendimento de produtos de hidrogenação foi relacionado à existência de um efeito eletrônico entre os sítios de Brönsted do suporte e as partículas de sulfeto suportado. No entanto, para o catalisador suportado em alumina-zeólita, onde em princípio a fase hidrogenante estaria distante dos sítios ácidos, sugeriu-se a possibilidade de uma rota alternativa de hidrogenação a partir do metil-indano formado nos centros ácidos da zeólita.

Three sulfided catalysts with the same active phase content (20 wt% of molybdenum oxide and 4 wt% of nickel oxide) and deposited on different supports (alumina, silica-alumina and alumina-Y zeolite) were prepared aiming to obtain bifunctional catalysts with different acidities and good dispersion of the sulfide phase for analyzing the role of the support acidity on the hydroconversion of tetraline. The supports and respective catalysts were characterized in the oxide and sulfide forms and were evaluated for the hydroconversion of tetraline, which is representative of the monoaromatic compounds present in the diesel fraction. The textural characterization indicated that the specific surface areas as well as the pore volumes were very little affected by the impregnation of the metal oxides in the supports. The catalysts presented a relatively good dispersion of the active phase as indicated by TEM, XRD and DRS results. Pyridine IR spectroscopy and n-propylamine TPD results showed an increase of Brönsted acidity after impregnation of molybdenum and nickel oxides, which were…

Advisors/Committee Members: Cristiane Assumpção Henriques, Lucia Regina Raddi de Araujo, José Luiz Zotin, Leonardo Nogueira, Alexandre Moura Stumbo.

Subjects/Keywords: ENGENHARIA QUIMICA; acidez do suporte, hidrogenação da tetralina, catalisadores bifuncionais NiMo; support acidity, tetraline hydrogenation, bifunctional catalysts

Record DetailsSimilar RecordsGoogle PlusoneFacebookTwitterCiteULikeMendeleyreddit

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

APA (6th Edition):

Ferraz, S. G. d. A. (2008). A influência da acidez do suporte de catalisadores Ni-Mo sobre a atividade da reação de hidrogenação de aromáticos e abertura de ciclo naftênico. (Masters Thesis). Universidade do Estado do Rio de Janeiro. Retrieved from http://www.bdtd.uerj.br/tde_busca/arquivo.php?codArquivo=6820 ;

Chicago Manual of Style (16th Edition):

Ferraz, Sheila Guimarães de Almeida. “A influência da acidez do suporte de catalisadores Ni-Mo sobre a atividade da reação de hidrogenação de aromáticos e abertura de ciclo naftênico.” 2008. Masters Thesis, Universidade do Estado do Rio de Janeiro. Accessed August 12, 2020. http://www.bdtd.uerj.br/tde_busca/arquivo.php?codArquivo=6820 ;.

MLA Handbook (7th Edition):

Ferraz, Sheila Guimarães de Almeida. “A influência da acidez do suporte de catalisadores Ni-Mo sobre a atividade da reação de hidrogenação de aromáticos e abertura de ciclo naftênico.” 2008. Web. 12 Aug 2020.

Vancouver:

Ferraz SGdA. A influência da acidez do suporte de catalisadores Ni-Mo sobre a atividade da reação de hidrogenação de aromáticos e abertura de ciclo naftênico. [Internet] [Masters thesis]. Universidade do Estado do Rio de Janeiro; 2008. [cited 2020 Aug 12]. Available from: http://www.bdtd.uerj.br/tde_busca/arquivo.php?codArquivo=6820 ;.

Council of Science Editors:

Ferraz SGdA. A influência da acidez do suporte de catalisadores Ni-Mo sobre a atividade da reação de hidrogenação de aromáticos e abertura de ciclo naftênico. [Masters Thesis]. Universidade do Estado do Rio de Janeiro; 2008. Available from: http://www.bdtd.uerj.br/tde_busca/arquivo.php?codArquivo=6820 ;

2. Cacciuttolo, Bastien. Formation de composés polycycliques par activation de doubles liaisons : approche catalytique intra et intermoléculaire de réactions de type Friedel-Crafts : applications au domaine des arômes et parfums : Non disponible.

Degree: Docteur es, Chimie, 2013, Nice

L’utilisation de méthodologies de synthèse toujours plus performantes et respectueuses de l’environnement est un axe de recherche majeur de la chimie moderne. L’apport de la catalyse, avec l’utilisation de superacides de Lewis, a permis d’améliorer de nombreux processus synthétiques. Nous avons pu développer dans ce manuscrit des réactions de cycloisomérisation de type réaction de Friedel-Crafts qui donnent accès à un ensemble de structures polycycliques intéressantes avec de bons rendements et sélectivités. L’utilisation d’une quantité catalytique, entre 1 et 10 mol% de Bi(OTf)3, permet l’activation d’oléfines et d’allènes non activés ainsi que de systèmes 1,3-diéniques. Ce type de méthodologie, à économie d’atomes maximale, a permis de limiter la formation de sous-produits, le catalyseur pouvant être recyclé et réutilisé sans perte d’activité. Des approches intra- et intermoléculaires, des réactions cascades et tandems ainsi qu’une étude mécanistique ont été effectuées afin de mieux comprendre la réactivité et ses limitations, et ainsi atteindre une plus large gamme de structures. Les méthodologies développées ont été appliquées au domaine des arômes et parfums pour la synthèse d’analogues de la Calone 1951®, de chromanes, d’indanes et de tétralines fonctionnalisés, posant les bases de travaux futurs pour une meilleur compréhension des relations structures-odeurs

Efficient and ecofriendly synthetic methodologies have always constituted an important area of research in modern organic chemistry. Lewis superacid catalysis has contributed in the improvement of many synthetic processes. We have developed some cycloisomerization reactions including Friedel-Crafts type reaction, giving access to a set of interesting polycyclic structures with good yields and selectivities. The use of a catalytic amount of Bi(OTf)3 (1 to 10 mol%), has allowed the activation of olefins, non-activated allenes and of 1,3-dienic systems. This atom economy methodology can prevent the formation of by-products and the catalyst can be recycled without loss of activity. Intra- and intermolecular approaches, tandem and cascades reactions, as well as mechanistic studies were conducted to enable a better understanding of the reactivity and its limitations to reach a wider range of structures. The developed methodologies were applied to the field of flavors and fragrances in the synthesis of Calone 1951® analogues, and for the preparation of chromans, indanes and tetralins type functionalized structures, for a better understanding of the structure/odor relationship.

Advisors/Committee Members: Duñach-Clinet, Elisabet (thesis director).

Subjects/Keywords: Friedel-Crafts; Cyclisation; Catalyse; Triflate de bismuth; Oléfine non activée; Allène; Diène-1,3; Calone 1951; Chromane; Indane; Tétraline; Benzosubérane; Friedel-Crafts; Cyclization; Catalysis; Bismuth triflate; Unactivated olefine; Allene; 1,3-diene; Calone 1951; Chromane; Indane; Tetraline; Benzosuberane; 540

Record DetailsSimilar RecordsGoogle PlusoneFacebookTwitterCiteULikeMendeleyreddit

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

APA (6th Edition):

Cacciuttolo, B. (2013). Formation de composés polycycliques par activation de doubles liaisons : approche catalytique intra et intermoléculaire de réactions de type Friedel-Crafts : applications au domaine des arômes et parfums : Non disponible. (Doctoral Dissertation). Nice. Retrieved from http://www.theses.fr/2013NICE4009

Chicago Manual of Style (16th Edition):

Cacciuttolo, Bastien. “Formation de composés polycycliques par activation de doubles liaisons : approche catalytique intra et intermoléculaire de réactions de type Friedel-Crafts : applications au domaine des arômes et parfums : Non disponible.” 2013. Doctoral Dissertation, Nice. Accessed August 12, 2020. http://www.theses.fr/2013NICE4009.

MLA Handbook (7th Edition):

Cacciuttolo, Bastien. “Formation de composés polycycliques par activation de doubles liaisons : approche catalytique intra et intermoléculaire de réactions de type Friedel-Crafts : applications au domaine des arômes et parfums : Non disponible.” 2013. Web. 12 Aug 2020.

Vancouver:

Cacciuttolo B. Formation de composés polycycliques par activation de doubles liaisons : approche catalytique intra et intermoléculaire de réactions de type Friedel-Crafts : applications au domaine des arômes et parfums : Non disponible. [Internet] [Doctoral dissertation]. Nice; 2013. [cited 2020 Aug 12]. Available from: http://www.theses.fr/2013NICE4009.

Council of Science Editors:

Cacciuttolo B. Formation de composés polycycliques par activation de doubles liaisons : approche catalytique intra et intermoléculaire de réactions de type Friedel-Crafts : applications au domaine des arômes et parfums : Non disponible. [Doctoral Dissertation]. Nice; 2013. Available from: http://www.theses.fr/2013NICE4009

3. 竹田, 健治. アトロプ異性体の不斉誘起に関する研究.

Degree: Japan Advanced Institute of Science and Technology / 北陸先端科学技術大学院大学

Supervisor:辻本 和雄

材料科学研究科

修士

Subjects/Keywords: 軸不斉、光異性化反応、テトラリン誘導体、立体選択的反応; atropisomer, photoisomerization, tetraline derivat

Record DetailsSimilar RecordsGoogle PlusoneFacebookTwitterCiteULikeMendeleyreddit

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

APA (6th Edition):

竹田, . (n.d.). アトロプ異性体の不斉誘起に関する研究. (Thesis). Japan Advanced Institute of Science and Technology / 北陸先端科学技術大学院大学. Retrieved from http://hdl.handle.net/10119/2510

Note: this citation may be lacking information needed for this citation format:
No year of publication.
Not specified: Masters Thesis or Doctoral Dissertation

Chicago Manual of Style (16th Edition):

竹田, 健治. “アトロプ異性体の不斉誘起に関する研究.” Thesis, Japan Advanced Institute of Science and Technology / 北陸先端科学技術大学院大学. Accessed August 12, 2020. http://hdl.handle.net/10119/2510.

Note: this citation may be lacking information needed for this citation format:
No year of publication.
Not specified: Masters Thesis or Doctoral Dissertation

MLA Handbook (7th Edition):

竹田, 健治. “アトロプ異性体の不斉誘起に関する研究.” Web. 12 Aug 2020.

Note: this citation may be lacking information needed for this citation format:
No year of publication.

Vancouver:

竹田 . アトロプ異性体の不斉誘起に関する研究. [Internet] [Thesis]. Japan Advanced Institute of Science and Technology / 北陸先端科学技術大学院大学; [cited 2020 Aug 12]. Available from: http://hdl.handle.net/10119/2510.

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
No year of publication.

Council of Science Editors:

竹田 . アトロプ異性体の不斉誘起に関する研究. [Thesis]. Japan Advanced Institute of Science and Technology / 北陸先端科学技術大学院大学; Available from: http://hdl.handle.net/10119/2510

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
No year of publication.

.