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Previous issue date: 2017-10-27 / Coordena??o de Aperfei?oamento de Pessoal de N?vel Superior (CAPES) / Nesta tese de doutorado estudou-se o agente direcionador de estrutura 2-etil-1,3,4-
trimetilimidaz?lio no contexto da s?ntese de ze?litas e ze?tipos em meio fluoreto.
Inicialmente, foi realizado um estudo aprofundado da ze?lita pura silica HPM-1 para o
entendimento do papel do c?tion na nuclea??o e crescimento zeol?tico, conseguindo explicar a
forma??o dos canais helicoidais e a ordem de apari??o das unidades secund?rias de
constru??o. Subsequentemente, foi empregada uma metodologia de introdu??o de
hetero?tomos em HPM-1 para proporcionar propriedades catal?ticas a esta, nunca tendo sido
empregada o presente m?todo nesta topologia zeol?tica anteriormente. Como resultado,
obtiveram-se tr?s materiais Al-HPM-1 diferentes, que foram caracterizados e testados na
rea??o de dehidrata??o de etanol. Finalmente, foi realizado um estudo explorat?rio do c?tion
org?nico em s?ntese de ze?tipos (com Si, Al e P), resultando em duas fases SAPO: os ze?tipos
CHA e LTA. Foi comprovado que a estrutura SAPO-CHA foi direcionada n?o somente pelo
emprego do composto org?nico e do meio fluoreto, mas sua obten??o foi devida ? temperatura
e a uma combina??o de dilui??o e tempo. No caso do SAPO-LTA, o efeito direcionador foi
consequ?ncia majoritariamente pelo emprego do c?tion org?nico. / In this doctoral thesis the structure-directing agent 2-ethyl-1,3,4-trimethylimidazolium was
studied in the context of zeolite and zeotype synthesis in hydrofluoric media. Initially, it was
deepened into the study of the pure silica zeolite HPM-1 to understand the role of the cation in
the nucleation and growth, explaining the helical channels and the order of secondary building
units formation. Subsequently, an alternative methodology of heteroatom introduction, never
reported for the present material, was also presented to give HPM-1 catalytic properties. As a
result of it, three different Al-HPM-1 samples were obtained, characterized and tested in
ethanol dehydration reaction. Finally, an exploratory study of the organic cation in zeotype
synthesis (with Si, Al and P) was performed, giving two main SAPO phases: CHA and LTA
zeotypes. It was proven that the SAPO-CHA structure was directed not only by the use of the
organic cation and the hydrofluoric media, but also its obtention was influenced by the
temperature and a combination of dilution and time. In the case of the SAPO-LTA, the
directing effect was mainly due to the organic cation.
| Identifer | oai:union.ndltd.org:IBICT/oai:repositorio.ufrn.br:123456789/24641 |
| Date | 27 October 2017 |
| Creators | Melguizo, Paloma Vinaches |
| Contributors | 50942611004, Melo, Dulce Maria de Ara?jo, 06117988320, Vitor Sobrinho, Eledir, 64656969915, Meneau, Florian Edouard Pierre, 23644447802, Gusm?o, Katia Bernardo, 51985764091, Pergher, Sibele Berenice Castella |
| Publisher | PROGRAMA DE P?S-GRADUA??O EM CI?NCIA E ENGENHARIA DE MATERIAIS, UFRN, Brasil |
| Source Sets | IBICT Brazilian ETDs |
| Language | Portuguese |
| Detected Language | English |
| Type | info:eu-repo/semantics/publishedVersion, info:eu-repo/semantics/doctoralThesis |
| Source | reponame:Repositório Institucional da UFRN, instname:Universidade Federal do Rio Grande do Norte, instacron:UFRN |
| Rights | info:eu-repo/semantics/openAccess |
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