Síntese, caracterizaçao e propriedades catalicas da peneira molecular nanoestruturada modificada com lantanio
Autor(a) principal: | |
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Data de Publicação: | 2009 |
Tipo de documento: | Tese |
Idioma: | por |
Título da fonte: | Repositório Institucional da UFRN |
Texto Completo: | https://repositorio.ufrn.br/jspui/handle/123456789/17726 |
Resumo: | The nanostructured molecular sieve SBA-15 was synthesized by the hydrothermal method, and modified with lanthanum with Si/La molar ratios of 25, 50, 75 and 100. The materials were evaluated as catalysts for the cracking of n-hexane model reaction. Type SBA- 15 and LaSBA-15 mesoporous materials were synthesized using tetraetilortosilicato as a source of silica, hydrochloric acid, heptahydrate lanthanum chloride and distilled water. Pluronic P123 triblock. polymer was used as structure template. The syntheses were carried out by 72 hours. The obtained SBA-15 samples were previously analyzed by thermogravimetry, in order to check the conditions of calcination for removal of organic template. Then, the calcined materials were characterized by X-ray diffraction, infrared spectroscopy, adsorption and desorption of nitrogen, scanning electron microscopy and X-ray microanalysis by dispersive energy. The acidity of the samples was determined using adsorption of n-bulinamina and desorption followed by thermogravimetry. It was found that the hydrothermal synthesis method was suitable for the synthesis of the SBA-15 mesoporous materials, with an excellent degree of hexagonal ordering. The reactions of catalytic cracking of n-hexane were carried out using a fixed bed continuous flow microreactor, coupled on-line to a gas chromatograph. From the catalytic evaluation, it was observed that the mesoporous materials containing lanthanum showed different results for the reaction of cracking of nhexane compared to the unmodified mesoporous material SBA-15. As a result of cracking was obtained as main products hydrocarbons in the range of C1 to C5. The catalyst that showed better properties in relation to the acidity and catalytic activity was LaSBA-15 with the ratio Si/La = 50 |
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Quintella, Solange Assunçãohttp://lattes.cnpq.br/7521511093074177http://lattes.cnpq.br/9770622597949866Silva, Zelma Rocha dahttp://lattes.cnpq.br/9530744851546230Delgado, Regina Celia de Oliveira Brasilhttp://lattes.cnpq.br/1862313412291911Barros, Joana Maria de Fariashttp://lattes.cnpq.br/1016070459137884Araújo, Antônio Souza de2014-12-17T15:42:09Z2011-03-012014-12-17T15:42:09Z2009-08-06QUINTELLA, Solange Assunção. Síntese, caracterizaçao e propriedades catalicas da peneira molecular nanoestruturada modificada com lantanio. 2009. 90 f. Tese (Doutorado em Físico-Química; Química) - Universidade Federal do Rio Grande do Norte, Natal, 2009.https://repositorio.ufrn.br/jspui/handle/123456789/17726The nanostructured molecular sieve SBA-15 was synthesized by the hydrothermal method, and modified with lanthanum with Si/La molar ratios of 25, 50, 75 and 100. The materials were evaluated as catalysts for the cracking of n-hexane model reaction. Type SBA- 15 and LaSBA-15 mesoporous materials were synthesized using tetraetilortosilicato as a source of silica, hydrochloric acid, heptahydrate lanthanum chloride and distilled water. Pluronic P123 triblock. polymer was used as structure template. The syntheses were carried out by 72 hours. The obtained SBA-15 samples were previously analyzed by thermogravimetry, in order to check the conditions of calcination for removal of organic template. Then, the calcined materials were characterized by X-ray diffraction, infrared spectroscopy, adsorption and desorption of nitrogen, scanning electron microscopy and X-ray microanalysis by dispersive energy. The acidity of the samples was determined using adsorption of n-bulinamina and desorption followed by thermogravimetry. It was found that the hydrothermal synthesis method was suitable for the synthesis of the SBA-15 mesoporous materials, with an excellent degree of hexagonal ordering. The reactions of catalytic cracking of n-hexane were carried out using a fixed bed continuous flow microreactor, coupled on-line to a gas chromatograph. From the catalytic evaluation, it was observed that the mesoporous materials containing lanthanum showed different results for the reaction of cracking of nhexane compared to the unmodified mesoporous material SBA-15. As a result of cracking was obtained as main products hydrocarbons in the range of C1 to C5. The catalyst that showed better properties in relation to the acidity and catalytic activity was LaSBA-15 with the ratio Si/La = 50A peneira molecular nanoestruturada SBA-15 foi sintetizada pelo método hidrotérmico, e modificada com lantânio com razões molares Si/La de 25, 50, 75 e 100. Os materiais obtidos foram avaliados como catalisador para a reação modelo de craqueamento de n-hexano. Os materiais mesoporosos tipo SBA-15 e LaSBA-15 foram sintetizados utilizando tetraetilortosilicato, como fonte de sílica, ácido clorídrico, cloreto de lantânio heptahidratado e água destilada. Como direcionador estrutural foi utilizado copolímero tribloco Pluronic P123. As sínteses foram realizadas durante 72 horas. As amostras de SBA-15 modificadas foram avaliadas por termogravimetria para verificar as condições de calcinação para remoção do direcionador orgânico. Após a retirada do direcionador as amostras de SBA-15 modificadas com diversas razões Si/La (25, 50, 75 e 100) foram caracterizadas por análises por difração de raios-X, espectroscopia na região do infravermelho, adsorção e dessorção de nitrogênio, microscopia eletrônica de varredura e microanálise de raios X por energia dispersiva. A acidez das amostras foi determinada utilizando adsorção de n-bulinamina seguido de dessorçao por termogravimetria. Verificou-se que o método de síntese hidrotérmica foi adequado à síntese dos materiais mesoporosos modificados com excelente grau de ordenação hexagonal. As reações de craqueamento catalítico do n-hexano foram realizadas em um microreator catalítico de leito fixo com fluxo contínuo acoplado em linha com um cromatógrafo a gás. A partir da avaliação catalítica, foi observado que os materiais mesoporosos contendo lantânio foram mais ativos que o SBA-15, para a reação de craqueamento do n-hexano, obtendo-se como produto hidrocarbonetos na faixa de C1 a C5. O catalisador que apresentou melhores propriedades, em relação à acidez e a atividade catalítica foi o sintetizado com a razão Si/La=50Coordenação de Aperfeiçoamento de Pessoal de Nível Superiorapplication/pdfporUniversidade Federal do Rio Grande do NortePrograma de Pós-Graduação em QuímicaUFRNBRFísico-Química; QuímicaMateriais mesoporososSBA-15Craqueamento catalíticoLantânioMesopores materialsSBA-15Cracking catalyticLanthanumCNPQ::CIENCIAS EXATAS E DA TERRA::QUIMICASíntese, caracterizaçao e propriedades catalicas da peneira molecular nanoestruturada modificada com lantanioinfo:eu-repo/semantics/publishedVersioninfo:eu-repo/semantics/doctoralThesisinfo:eu-repo/semantics/openAccessreponame:Repositório Institucional da UFRNinstname:Universidade Federal do Rio Grande do Norte (UFRN)instacron:UFRNORIGINALSolangeAQ_TESE.pdfapplication/pdf2741616https://repositorio.ufrn.br/bitstream/123456789/17726/1/SolangeAQ_TESE.pdfad21da6882b166123a02d610e3d096efMD51TEXTSolangeAQ_TESE.pdf.txtSolangeAQ_TESE.pdf.txtExtracted texttext/plain130249https://repositorio.ufrn.br/bitstream/123456789/17726/6/SolangeAQ_TESE.pdf.txt4b182a59d648c95b5957f1cb3b9225aaMD56THUMBNAILSolangeAQ_TESE.pdf.jpgSolangeAQ_TESE.pdf.jpgIM Thumbnailimage/jpeg5038https://repositorio.ufrn.br/bitstream/123456789/17726/7/SolangeAQ_TESE.pdf.jpgd1fda93052d5abc60200d85fece40067MD57123456789/177262017-11-04 15:05:48.814oai:https://repositorio.ufrn.br:123456789/17726Repositório de PublicaçõesPUBhttp://repositorio.ufrn.br/oai/opendoar:2017-11-04T18:05:48Repositório Institucional da UFRN - Universidade Federal do Rio Grande do Norte (UFRN)false |
dc.title.por.fl_str_mv |
Síntese, caracterizaçao e propriedades catalicas da peneira molecular nanoestruturada modificada com lantanio |
title |
Síntese, caracterizaçao e propriedades catalicas da peneira molecular nanoestruturada modificada com lantanio |
spellingShingle |
Síntese, caracterizaçao e propriedades catalicas da peneira molecular nanoestruturada modificada com lantanio Quintella, Solange Assunção Materiais mesoporosos SBA-15 Craqueamento catalítico Lantânio Mesopores materials SBA-15 Cracking catalytic Lanthanum CNPQ::CIENCIAS EXATAS E DA TERRA::QUIMICA |
title_short |
Síntese, caracterizaçao e propriedades catalicas da peneira molecular nanoestruturada modificada com lantanio |
title_full |
Síntese, caracterizaçao e propriedades catalicas da peneira molecular nanoestruturada modificada com lantanio |
title_fullStr |
Síntese, caracterizaçao e propriedades catalicas da peneira molecular nanoestruturada modificada com lantanio |
title_full_unstemmed |
Síntese, caracterizaçao e propriedades catalicas da peneira molecular nanoestruturada modificada com lantanio |
title_sort |
Síntese, caracterizaçao e propriedades catalicas da peneira molecular nanoestruturada modificada com lantanio |
author |
Quintella, Solange Assunção |
author_facet |
Quintella, Solange Assunção |
author_role |
author |
dc.contributor.authorID.por.fl_str_mv |
|
dc.contributor.authorLattes.por.fl_str_mv |
http://lattes.cnpq.br/7521511093074177 |
dc.contributor.advisorID.por.fl_str_mv |
|
dc.contributor.advisorLattes.por.fl_str_mv |
http://lattes.cnpq.br/9770622597949866 |
dc.contributor.referees1.pt_BR.fl_str_mv |
Silva, Zelma Rocha da |
dc.contributor.referees1ID.por.fl_str_mv |
|
dc.contributor.referees1Lattes.por.fl_str_mv |
http://lattes.cnpq.br/9530744851546230 |
dc.contributor.referees2.pt_BR.fl_str_mv |
Delgado, Regina Celia de Oliveira Brasil |
dc.contributor.referees2ID.por.fl_str_mv |
|
dc.contributor.referees2Lattes.por.fl_str_mv |
http://lattes.cnpq.br/1862313412291911 |
dc.contributor.referees3.pt_BR.fl_str_mv |
Barros, Joana Maria de Farias |
dc.contributor.referees3ID.por.fl_str_mv |
|
dc.contributor.referees3Lattes.por.fl_str_mv |
http://lattes.cnpq.br/1016070459137884 |
dc.contributor.author.fl_str_mv |
Quintella, Solange Assunção |
dc.contributor.advisor1.fl_str_mv |
Araújo, Antônio Souza de |
contributor_str_mv |
Araújo, Antônio Souza de |
dc.subject.por.fl_str_mv |
Materiais mesoporosos SBA-15 Craqueamento catalítico Lantânio |
topic |
Materiais mesoporosos SBA-15 Craqueamento catalítico Lantânio Mesopores materials SBA-15 Cracking catalytic Lanthanum CNPQ::CIENCIAS EXATAS E DA TERRA::QUIMICA |
dc.subject.eng.fl_str_mv |
Mesopores materials SBA-15 Cracking catalytic Lanthanum |
dc.subject.cnpq.fl_str_mv |
CNPQ::CIENCIAS EXATAS E DA TERRA::QUIMICA |
description |
The nanostructured molecular sieve SBA-15 was synthesized by the hydrothermal method, and modified with lanthanum with Si/La molar ratios of 25, 50, 75 and 100. The materials were evaluated as catalysts for the cracking of n-hexane model reaction. Type SBA- 15 and LaSBA-15 mesoporous materials were synthesized using tetraetilortosilicato as a source of silica, hydrochloric acid, heptahydrate lanthanum chloride and distilled water. Pluronic P123 triblock. polymer was used as structure template. The syntheses were carried out by 72 hours. The obtained SBA-15 samples were previously analyzed by thermogravimetry, in order to check the conditions of calcination for removal of organic template. Then, the calcined materials were characterized by X-ray diffraction, infrared spectroscopy, adsorption and desorption of nitrogen, scanning electron microscopy and X-ray microanalysis by dispersive energy. The acidity of the samples was determined using adsorption of n-bulinamina and desorption followed by thermogravimetry. It was found that the hydrothermal synthesis method was suitable for the synthesis of the SBA-15 mesoporous materials, with an excellent degree of hexagonal ordering. The reactions of catalytic cracking of n-hexane were carried out using a fixed bed continuous flow microreactor, coupled on-line to a gas chromatograph. From the catalytic evaluation, it was observed that the mesoporous materials containing lanthanum showed different results for the reaction of cracking of nhexane compared to the unmodified mesoporous material SBA-15. As a result of cracking was obtained as main products hydrocarbons in the range of C1 to C5. The catalyst that showed better properties in relation to the acidity and catalytic activity was LaSBA-15 with the ratio Si/La = 50 |
publishDate |
2009 |
dc.date.issued.fl_str_mv |
2009-08-06 |
dc.date.available.fl_str_mv |
2011-03-01 2014-12-17T15:42:09Z |
dc.date.accessioned.fl_str_mv |
2014-12-17T15:42:09Z |
dc.type.status.fl_str_mv |
info:eu-repo/semantics/publishedVersion |
dc.type.driver.fl_str_mv |
info:eu-repo/semantics/doctoralThesis |
format |
doctoralThesis |
status_str |
publishedVersion |
dc.identifier.citation.fl_str_mv |
QUINTELLA, Solange Assunção. Síntese, caracterizaçao e propriedades catalicas da peneira molecular nanoestruturada modificada com lantanio. 2009. 90 f. Tese (Doutorado em Físico-Química; Química) - Universidade Federal do Rio Grande do Norte, Natal, 2009. |
dc.identifier.uri.fl_str_mv |
https://repositorio.ufrn.br/jspui/handle/123456789/17726 |
identifier_str_mv |
QUINTELLA, Solange Assunção. Síntese, caracterizaçao e propriedades catalicas da peneira molecular nanoestruturada modificada com lantanio. 2009. 90 f. Tese (Doutorado em Físico-Química; Química) - Universidade Federal do Rio Grande do Norte, Natal, 2009. |
url |
https://repositorio.ufrn.br/jspui/handle/123456789/17726 |
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por |
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por |
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info:eu-repo/semantics/openAccess |
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openAccess |
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Universidade Federal do Rio Grande do Norte |
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Programa de Pós-Graduação em Química |
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UFRN |
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BR |
dc.publisher.department.fl_str_mv |
Físico-Química; Química |
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Universidade Federal do Rio Grande do Norte |
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