Transformação de cicloexano e metilcicloexano sobre as zeólitas HMCM-22, HZSM-5 e HUSY rendimento e seletividade a hidrocarbonetos leves

Detalhes bibliográficos
Autor(a) principal: Scherer, Ediane Karine
Data de Publicação: 2009
Tipo de documento: Dissertação
Idioma: por
Título da fonte: Repositório Institucional da UFSCAR
Texto Completo: https://repositorio.ufscar.br/handle/ufscar/4024
Resumo: In Brazil, the oil production with high naphthenic hydrocarbon (HC) content and the hard growing for the petrochemical market have led to the necessity to maximize the production of light HC (in special light olefins). The new technologies must involve the use of acid catalysts that have high activity and selectivity. In despite of the naphthenic HC make part of the feed of the FCC reactor, few studies have been devoted to their transformations on HUSY and HZSM-5 zeolites, main active components of the FCC catalysts, and also on the MCM-22 zeolite. In this context, the objective of this work was to evaluate the cyclohexane and methylcyclohexane transformations on the above mentioned zeolites. The MCM-22 was hydrothermally synthesized under static conditions and in the case of USY and ZSM-5 zeolites, commercial samples were used. The samples were characterized by thermogravimetric analysis, X ray diffraction, chemical analysis, nitrogen sorption, scanning electron microscopy, and evaluated in the cyclohexane and methylcyclohexane transformation at 400 oC, with after carbon analysis. The studied zeolites were active in the studied reactions, nevertheless, the conversion, yield and selectivity to light HC were dependent on the zeolite structure, number and strength of the acid sites and the external area. The HUSY zeolite, due to their higher aluminum content, showed higher activity with high yield to isomerization products. On the contrary, on the HZSM-5 zeolite the cracking products were favored with high selectivity to propane and butane. On the base of their structural and textural properties, the HMCM-22 zeolite showed a mixture of cracking and isomerization products. The selectivity to light olefins (C2=, C3= and C4=) was higher on the HZSM-5 zeolite, in which the bimolecular reactions of hydrogen transference were not favored due to the steric restrictions imposed by their microporous, which are smaller in diameter. The microporous structure was determinant in the zeolite deactivation by coke formation.
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spelling Scherer, Ediane KarineUrquieta-González, Ernesto Antoniohttp://lattes.cnpq.br/2389975677904655http://lattes.cnpq.br/98137170463784042016-06-02T19:56:35Z2009-11-132016-06-02T19:56:35Z2009-03-27SCHERER, Ediane Karine. Transformação de cicloexano e metilcicloexano sobre as zeólitas HMCM-22, HZSM-5 e HUSY rendimento e seletividade a hidrocarbonetos leves. 2009. 151 f. Dissertação (Mestrado em Ciências Exatas e da Terra) - Universidade Federal de São Carlos, São Carlos, 2009.https://repositorio.ufscar.br/handle/ufscar/4024In Brazil, the oil production with high naphthenic hydrocarbon (HC) content and the hard growing for the petrochemical market have led to the necessity to maximize the production of light HC (in special light olefins). The new technologies must involve the use of acid catalysts that have high activity and selectivity. In despite of the naphthenic HC make part of the feed of the FCC reactor, few studies have been devoted to their transformations on HUSY and HZSM-5 zeolites, main active components of the FCC catalysts, and also on the MCM-22 zeolite. In this context, the objective of this work was to evaluate the cyclohexane and methylcyclohexane transformations on the above mentioned zeolites. The MCM-22 was hydrothermally synthesized under static conditions and in the case of USY and ZSM-5 zeolites, commercial samples were used. The samples were characterized by thermogravimetric analysis, X ray diffraction, chemical analysis, nitrogen sorption, scanning electron microscopy, and evaluated in the cyclohexane and methylcyclohexane transformation at 400 oC, with after carbon analysis. The studied zeolites were active in the studied reactions, nevertheless, the conversion, yield and selectivity to light HC were dependent on the zeolite structure, number and strength of the acid sites and the external area. The HUSY zeolite, due to their higher aluminum content, showed higher activity with high yield to isomerization products. On the contrary, on the HZSM-5 zeolite the cracking products were favored with high selectivity to propane and butane. On the base of their structural and textural properties, the HMCM-22 zeolite showed a mixture of cracking and isomerization products. The selectivity to light olefins (C2=, C3= and C4=) was higher on the HZSM-5 zeolite, in which the bimolecular reactions of hydrogen transference were not favored due to the steric restrictions imposed by their microporous, which are smaller in diameter. The microporous structure was determinant in the zeolite deactivation by coke formation.No Brasil, a produção de petróleo com alto teor de hidrocarbonetos (HC) naftênicos (cicloalcanos) e o forte crescimento da industria petroquímica, tem conduzido a necessidade de maximizar a transformação desses compostos com produção seletiva de HC leves (em especial eteno e propeno). As novas tecnologias devem envolver o uso de catalisadores ácidos que possuam altas atividade e seletividade. Embora os HC naftênicos sejam importantes constituintes da alimentação do processo FCC, poucos estudos contemplam suas transformações sobre as zeólitas HUSY e HZSM-5, principais componentes ativos do catalisador FCC e, também, sobre a zeolita HMCM-22. Assim, objetivou-se neste trabalho avaliar a transformação dos compostos cicloexano e metilcicloexano sobre as zeólitas mencionadas. A zeólita MCM-22 foi sintetizada via tratamento hidrotérmico sob condições estáticas e no caso das zeólitas USY e ZSM-5 foram utilizadas amostras comerciais. As amostras foram caracterizadas por termogravimetria, difração de raios X, analise química, fisissorcao de nitrogênio, microscopia eletrônica de varredura, e avaliadas na transformação do cicloexano e metilcicloexano a 400oC, com posterior determinação do teor de carbono. As zeólitas estudadas se mostraram ativas na conversão desses compostos, porem, a conversão, rendimento e seletividade a HC leves foram dependentes do sistema poroso, teor de alumínio, forca dos sítios e densidade de sítios externos. A zeólita HUSY apresentou maiores conversões pelo seu maior teor alumínio, entretanto, pelos seus sítios ácidos de menor forca e menores restrições estéricas que na HZSM-5, apresentou maior seletividade a compostos provenientes de reações de isomerização. Ao contrario, a zeólita HZSM-5 originou melhores rendimentos a produtos de craqueamento, principalmente C3 e C4. E a zeólita HMCM-22, pelas suas características estruturais e texturais, apresentou uma distribuição mista de produtos de craqueamento e isomerização. A seletividade a olefinas leves (C2=, C3= e C4=) foi maior na zeólita HZSM-5, na qual as reações biomoleculares de transferência de hidrogênio foram desfavorecidas devido a restrições estéricas impostas pelo menor tamanho de seus microporos. A estrutura microporosa foi determinante na desativação das zeólitas por formação de coque.Universidade Federal de Sao Carlosapplication/pdfporUniversidade Federal de São CarlosPrograma de Pós-Graduação em Engenharia Química - PPGEQUFSCarBRCraqueamentoHidrocarbonetosPetróleo - refinaçãoZeólitaENGENHARIAS::ENGENHARIA QUIMICATransformação de cicloexano e metilcicloexano sobre as zeólitas HMCM-22, HZSM-5 e HUSY rendimento e seletividade a hidrocarbonetos levesinfo:eu-repo/semantics/publishedVersioninfo:eu-repo/semantics/masterThesisinfo:eu-repo/semantics/openAccessreponame:Repositório Institucional da UFSCARinstname:Universidade Federal de São Carlos (UFSCAR)instacron:UFSCARORIGINAL2405.pdfapplication/pdf4134171https://{{ getenv "DSPACE_HOST" "repositorio.ufscar.br" }}/bitstream/ufscar/4024/1/2405.pdf0f348736ad3db9c0d6c14d652178dc32MD51THUMBNAIL2405.pdf.jpg2405.pdf.jpgIM Thumbnailimage/jpeg6954https://{{ getenv "DSPACE_HOST" "repositorio.ufscar.br" }}/bitstream/ufscar/4024/2/2405.pdf.jpg966922004acb3a2f04cd97d676f23e50MD52ufscar/40242019-09-11 03:38:23.026oai:repositorio.ufscar.br:ufscar/4024Repositório InstitucionalPUBhttps://repositorio.ufscar.br/oai/requestopendoar:43222019-09-11T03:38:23Repositório Institucional da UFSCAR - Universidade Federal de São Carlos (UFSCAR)false
dc.title.por.fl_str_mv Transformação de cicloexano e metilcicloexano sobre as zeólitas HMCM-22, HZSM-5 e HUSY rendimento e seletividade a hidrocarbonetos leves
title Transformação de cicloexano e metilcicloexano sobre as zeólitas HMCM-22, HZSM-5 e HUSY rendimento e seletividade a hidrocarbonetos leves
spellingShingle Transformação de cicloexano e metilcicloexano sobre as zeólitas HMCM-22, HZSM-5 e HUSY rendimento e seletividade a hidrocarbonetos leves
Scherer, Ediane Karine
Craqueamento
Hidrocarbonetos
Petróleo - refinação
Zeólita
ENGENHARIAS::ENGENHARIA QUIMICA
title_short Transformação de cicloexano e metilcicloexano sobre as zeólitas HMCM-22, HZSM-5 e HUSY rendimento e seletividade a hidrocarbonetos leves
title_full Transformação de cicloexano e metilcicloexano sobre as zeólitas HMCM-22, HZSM-5 e HUSY rendimento e seletividade a hidrocarbonetos leves
title_fullStr Transformação de cicloexano e metilcicloexano sobre as zeólitas HMCM-22, HZSM-5 e HUSY rendimento e seletividade a hidrocarbonetos leves
title_full_unstemmed Transformação de cicloexano e metilcicloexano sobre as zeólitas HMCM-22, HZSM-5 e HUSY rendimento e seletividade a hidrocarbonetos leves
title_sort Transformação de cicloexano e metilcicloexano sobre as zeólitas HMCM-22, HZSM-5 e HUSY rendimento e seletividade a hidrocarbonetos leves
author Scherer, Ediane Karine
author_facet Scherer, Ediane Karine
author_role author
dc.contributor.authorlattes.por.fl_str_mv http://lattes.cnpq.br/9813717046378404
dc.contributor.author.fl_str_mv Scherer, Ediane Karine
dc.contributor.advisor1.fl_str_mv Urquieta-González, Ernesto Antonio
dc.contributor.referee1Lattes.fl_str_mv http://lattes.cnpq.br/2389975677904655
contributor_str_mv Urquieta-González, Ernesto Antonio
dc.subject.por.fl_str_mv Craqueamento
Hidrocarbonetos
Petróleo - refinação
Zeólita
topic Craqueamento
Hidrocarbonetos
Petróleo - refinação
Zeólita
ENGENHARIAS::ENGENHARIA QUIMICA
dc.subject.cnpq.fl_str_mv ENGENHARIAS::ENGENHARIA QUIMICA
description In Brazil, the oil production with high naphthenic hydrocarbon (HC) content and the hard growing for the petrochemical market have led to the necessity to maximize the production of light HC (in special light olefins). The new technologies must involve the use of acid catalysts that have high activity and selectivity. In despite of the naphthenic HC make part of the feed of the FCC reactor, few studies have been devoted to their transformations on HUSY and HZSM-5 zeolites, main active components of the FCC catalysts, and also on the MCM-22 zeolite. In this context, the objective of this work was to evaluate the cyclohexane and methylcyclohexane transformations on the above mentioned zeolites. The MCM-22 was hydrothermally synthesized under static conditions and in the case of USY and ZSM-5 zeolites, commercial samples were used. The samples were characterized by thermogravimetric analysis, X ray diffraction, chemical analysis, nitrogen sorption, scanning electron microscopy, and evaluated in the cyclohexane and methylcyclohexane transformation at 400 oC, with after carbon analysis. The studied zeolites were active in the studied reactions, nevertheless, the conversion, yield and selectivity to light HC were dependent on the zeolite structure, number and strength of the acid sites and the external area. The HUSY zeolite, due to their higher aluminum content, showed higher activity with high yield to isomerization products. On the contrary, on the HZSM-5 zeolite the cracking products were favored with high selectivity to propane and butane. On the base of their structural and textural properties, the HMCM-22 zeolite showed a mixture of cracking and isomerization products. The selectivity to light olefins (C2=, C3= and C4=) was higher on the HZSM-5 zeolite, in which the bimolecular reactions of hydrogen transference were not favored due to the steric restrictions imposed by their microporous, which are smaller in diameter. The microporous structure was determinant in the zeolite deactivation by coke formation.
publishDate 2009
dc.date.available.fl_str_mv 2009-11-13
2016-06-02T19:56:35Z
dc.date.issued.fl_str_mv 2009-03-27
dc.date.accessioned.fl_str_mv 2016-06-02T19:56:35Z
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dc.identifier.citation.fl_str_mv SCHERER, Ediane Karine. Transformação de cicloexano e metilcicloexano sobre as zeólitas HMCM-22, HZSM-5 e HUSY rendimento e seletividade a hidrocarbonetos leves. 2009. 151 f. Dissertação (Mestrado em Ciências Exatas e da Terra) - Universidade Federal de São Carlos, São Carlos, 2009.
dc.identifier.uri.fl_str_mv https://repositorio.ufscar.br/handle/ufscar/4024
identifier_str_mv SCHERER, Ediane Karine. Transformação de cicloexano e metilcicloexano sobre as zeólitas HMCM-22, HZSM-5 e HUSY rendimento e seletividade a hidrocarbonetos leves. 2009. 151 f. Dissertação (Mestrado em Ciências Exatas e da Terra) - Universidade Federal de São Carlos, São Carlos, 2009.
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