Influence of acidity in MTBE synthesis on modified Beta zeolites

Detalhes bibliográficos
Autor(a) principal: Gonzales, Adriano Morales
Data de Publicação: 2008
Outros Autores: Arroyo, Pedro Augusto
Tipo de documento: Artigo
Idioma: por
Título da fonte: Acta scientiarum. Technology (Online)
Texto Completo: http://www.periodicos.uem.br/ojs/index.php/ActaSciTechnol/article/view/2772
Resumo: Synthesis of MTBE on dealuminated and leaching Beta zeolites is provided. Hydrothermal and chemical dealumination of HBeta zeolite leads to less active catalysts due to a decrease in the total concentration of Brönsted acid sites. Furthermore, it has been verified that elimination of highly dispersed non-framework alumina species present in HBeta samples, by acid treatment, decreases catalytic activity, even though the zeolite has shown a higher content of Brönsted acid sites. It might be suggested that highly dispersed cationic non-framework aluminum species could interact with framework hydroxyls, generating Brönsted acid sites with enhanced catalytic activity. Thus, zeolite HBeta showed a maximum MTBE yield at 70oC, superior to the commercial catalyst (resin Amberlyst 15) and to other zeolites studied, within the context of reaction conditions utilized
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spelling Influence of acidity in MTBE synthesis on modified Beta zeolitesInfluência da acidez na síntese do MTBE sobre zeólitas Beta modificadasMTBEzeólita Betaacidezdesaluminizaçãoalumina extra-rede3.06.00.00-6 Engenharia QuímicaSynthesis of MTBE on dealuminated and leaching Beta zeolites is provided. Hydrothermal and chemical dealumination of HBeta zeolite leads to less active catalysts due to a decrease in the total concentration of Brönsted acid sites. Furthermore, it has been verified that elimination of highly dispersed non-framework alumina species present in HBeta samples, by acid treatment, decreases catalytic activity, even though the zeolite has shown a higher content of Brönsted acid sites. It might be suggested that highly dispersed cationic non-framework aluminum species could interact with framework hydroxyls, generating Brönsted acid sites with enhanced catalytic activity. Thus, zeolite HBeta showed a maximum MTBE yield at 70oC, superior to the commercial catalyst (resin Amberlyst 15) and to other zeolites studied, within the context of reaction conditions utilizedNo presente trabalho, estudou-se a reação de síntese do MTBE sobre zeólitas Beta desaluminizadas e lixiviadas. A desaluminização hidrotérmica e térmica da zeólita HBeta levou a catalisadores menos ativos devido à diminuição do concentração total de sítios ácidos de Brönsted. Além disso, verificou-se que a eliminação das espécies de alumínio extra-rede na amostra HBeta por tratamento ácido levou a uma diminuição na atividade catalítica da zeólita, mesmo esta apresentando uma maior concentração de sítios ácidos de Brönsted. Isto sugere que espécies de alumínio extra-rede catiônicas altamente dispersas interagem com as hidroxilas da rede zeolítica, gerando sítios de Brönsted com atividade catalítica aumentada. Deste modo, a zeólita HBeta apresentou rendimento máximo em MTBE a 70oC, sendo este superior ao mostrado pelo catalisador comercial (resina Amberlyst 15) e pelas demais zeólitas estudadas, nas condições de reação utilizadasUniversidade Estadual De Maringá2008-05-05info:eu-repo/semantics/articleinfo:eu-repo/semantics/publishedVersionapplication/pdfhttp://www.periodicos.uem.br/ojs/index.php/ActaSciTechnol/article/view/277210.4025/actascitechnol.v23i0.2772Acta Scientiarum. Technology; Vol 23 (2001); 1407-1414Acta Scientiarum. Technology; v. 23 (2001); 1407-14141806-25631807-8664reponame:Acta scientiarum. Technology (Online)instname:Universidade Estadual de Maringá (UEM)instacron:UEMporhttp://www.periodicos.uem.br/ojs/index.php/ActaSciTechnol/article/view/2772/1834Gonzales, Adriano MoralesArroyo, Pedro Augustoinfo:eu-repo/semantics/openAccess2024-05-17T13:02:49Zoai:periodicos.uem.br/ojs:article/2772Revistahttps://www.periodicos.uem.br/ojs/index.php/ActaSciTechnol/indexPUBhttps://www.periodicos.uem.br/ojs/index.php/ActaSciTechnol/oai||actatech@uem.br1807-86641806-2563opendoar:2024-05-17T13:02:49Acta scientiarum. Technology (Online) - Universidade Estadual de Maringá (UEM)false
dc.title.none.fl_str_mv Influence of acidity in MTBE synthesis on modified Beta zeolites
Influência da acidez na síntese do MTBE sobre zeólitas Beta modificadas
title Influence of acidity in MTBE synthesis on modified Beta zeolites
spellingShingle Influence of acidity in MTBE synthesis on modified Beta zeolites
Gonzales, Adriano Morales
MTBE
zeólita Beta
acidez
desaluminização
alumina extra-rede
3.06.00.00-6 Engenharia Química
title_short Influence of acidity in MTBE synthesis on modified Beta zeolites
title_full Influence of acidity in MTBE synthesis on modified Beta zeolites
title_fullStr Influence of acidity in MTBE synthesis on modified Beta zeolites
title_full_unstemmed Influence of acidity in MTBE synthesis on modified Beta zeolites
title_sort Influence of acidity in MTBE synthesis on modified Beta zeolites
author Gonzales, Adriano Morales
author_facet Gonzales, Adriano Morales
Arroyo, Pedro Augusto
author_role author
author2 Arroyo, Pedro Augusto
author2_role author
dc.contributor.author.fl_str_mv Gonzales, Adriano Morales
Arroyo, Pedro Augusto
dc.subject.por.fl_str_mv MTBE
zeólita Beta
acidez
desaluminização
alumina extra-rede
3.06.00.00-6 Engenharia Química
topic MTBE
zeólita Beta
acidez
desaluminização
alumina extra-rede
3.06.00.00-6 Engenharia Química
description Synthesis of MTBE on dealuminated and leaching Beta zeolites is provided. Hydrothermal and chemical dealumination of HBeta zeolite leads to less active catalysts due to a decrease in the total concentration of Brönsted acid sites. Furthermore, it has been verified that elimination of highly dispersed non-framework alumina species present in HBeta samples, by acid treatment, decreases catalytic activity, even though the zeolite has shown a higher content of Brönsted acid sites. It might be suggested that highly dispersed cationic non-framework aluminum species could interact with framework hydroxyls, generating Brönsted acid sites with enhanced catalytic activity. Thus, zeolite HBeta showed a maximum MTBE yield at 70oC, superior to the commercial catalyst (resin Amberlyst 15) and to other zeolites studied, within the context of reaction conditions utilized
publishDate 2008
dc.date.none.fl_str_mv 2008-05-05
dc.type.driver.fl_str_mv info:eu-repo/semantics/article
info:eu-repo/semantics/publishedVersion
format article
status_str publishedVersion
dc.identifier.uri.fl_str_mv http://www.periodicos.uem.br/ojs/index.php/ActaSciTechnol/article/view/2772
10.4025/actascitechnol.v23i0.2772
url http://www.periodicos.uem.br/ojs/index.php/ActaSciTechnol/article/view/2772
identifier_str_mv 10.4025/actascitechnol.v23i0.2772
dc.language.iso.fl_str_mv por
language por
dc.relation.none.fl_str_mv http://www.periodicos.uem.br/ojs/index.php/ActaSciTechnol/article/view/2772/1834
dc.rights.driver.fl_str_mv info:eu-repo/semantics/openAccess
eu_rights_str_mv openAccess
dc.format.none.fl_str_mv application/pdf
dc.publisher.none.fl_str_mv Universidade Estadual De Maringá
publisher.none.fl_str_mv Universidade Estadual De Maringá
dc.source.none.fl_str_mv Acta Scientiarum. Technology; Vol 23 (2001); 1407-1414
Acta Scientiarum. Technology; v. 23 (2001); 1407-1414
1806-2563
1807-8664
reponame:Acta scientiarum. Technology (Online)
instname:Universidade Estadual de Maringá (UEM)
instacron:UEM
instname_str Universidade Estadual de Maringá (UEM)
instacron_str UEM
institution UEM
reponame_str Acta scientiarum. Technology (Online)
collection Acta scientiarum. Technology (Online)
repository.name.fl_str_mv Acta scientiarum. Technology (Online) - Universidade Estadual de Maringá (UEM)
repository.mail.fl_str_mv ||actatech@uem.br
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