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Previous issue date: 2015-03-10 / Coordena??o de Aperfei?oamento de Pessoal de N?vel Superior (CAPES) / O uso de catalisadores ? de fundamental import?ncia para ind?stria petrol?fera,
tendo em vista que eles reduzem o tempo e a energia necess?rios para que uma rea??o
aconte?a, melhorando a efici?ncia e a qualidade dos produtos. Em contra partida os
mesmos acabam sofrendo desativa??o, que pode ser ocasionada por v?rios fatores, tais
como: envenenamento dos s?tios ativos por metais, sinteriza??o e pela forma??o de
coque, no qual provoca obstru??o nos poros causando assim a perda da fase ativa do
material. Ap?s v?rios ciclos de uso e regenera??o, os catalisadores s?o dispostos na
natureza tornando-se assim um grave problema ambiental. Diante dessa problem?tica o
presente trabalho teve como objetivo desativar e regenerar ze?litas ?cidas dos tipos
HZSM-5 e HY, a fim de comparar o comportamento das mesmas atrav?s das t?cnicas
de: difratometria de Raios-X, Adsor??o de Desor??o de n-butilamina, An?lises
Termogravim?tricas (TG/DTG) e espectroscopia na regi?o do infravermelho com
transformada de Fourier. A desativa??o foi realizada em um reator de microatividade
adaptado. Ap?s a rea??o foram obtidos os catalisadores desativados, e posteriormente
realizada a regenera??o em um forno tipo mufla. Atrav?s das curvas termogravim?tricas
de dessor??o de n-butilamina foi observado um aumento consider?vel na densidade de
s?tios ?cidos m?dios da HZSM-5, provavelmente novos s?tios de adsor??o foram
gerados durante a regenera??o. Observou-se tamb?m, que a ze?lita HZSM-5 apresentou
cerca de 8% de coque, enquanto que a HY apresentou 18%, essa maior porcentagem se
deu pelo fato da ze?lita faujasita (FAU) ser mais ?cida, e consequentemente promover
mais rea??es, por tanto maior forma??o de coque. O coque formado em ambas as
ze?litas tanto tiveram car?ter alif?ticos como arom?ticos. / The use of catalysts is of fundamental importance to the oil industry, given that
they reduce the time and energy required for a reaction to take place, improving
efficiency and product quality. In return they end up suffering deactivation, which can
be caused by several factors such as: poisoning of active sites for metals, sintering and
the formation of coke, which causes obstruction in the pores thus causing the loss of the
active phase of the material. After several cycles of use and regeneration, the catalysts
are arranged in nature thus becoming a serious environmental problem. Faced with this
problem the present study aimed to disable and regenerate acidic zeolites of HZSM-5
and HY types in order to compare the behavior of the same through the techniques: Xray
diffraction, adsorption of n-butyl amine Desorption, Analysis Thermogravimetric
(TG / DTG) and spectroscopy in the infrared Fourier transform. Disabling was held in
an adapted Micro activity reactor. After the reaction the deactivated catalysts were
obtained, and then performed regeneration in a muffle furnace. Through the
Thermogravimetric curves of n-butylamine desorption was observed a significant
increase in the density of acid sites of HZSM-5 average probably new adsorption sites
were generated during regeneration. It was also observed that the HZSM-5 zeolite
showed about 8% of coke, while HY showed 18% higher this percentage was due to the
fact that the zeolite faujasite (FAU) is more acidic, and thus promote further reaction, by
the greater coke formation. The coke formed in both zeolites have both aliphatic as
aromatic character.
| Identifer | oai:union.ndltd.org:IBICT/oai:repositorio.ufrn.br:123456789/20334 |
| Date | 10 March 2015 |
| Creators | Lima, Andresa Jaciane Cabral de |
| Contributors | 35530502415, http://lattes.cnpq.br/9770622597949866, Gondim, Amanda Duarte, 03014598437, http://lattes.cnpq.br/6738828245487480, Coriolano, Ana Catarina Fernandes, 83744479404, http://lattes.cnpq.br/5552621403067808, Ara?jo, Antonio Souza de |
| Publisher | Universidade Federal do Rio Grande do Norte, PROGRAMA DE P?S-GRADUA??O EM CI?NCIA E ENGENHARIA DE PETR?LEO, UFRN, Brasil |
| Source Sets | IBICT Brazilian ETDs |
| Language | Portuguese |
| Detected Language | Portuguese |
| Type | info:eu-repo/semantics/publishedVersion, info:eu-repo/semantics/masterThesis |
| 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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