Produção de eteno a partir de etanol utilizando aluminas
Autor(a) principal: | |
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Data de Publicação: | 2012 |
Tipo de documento: | Dissertação |
Idioma: | por |
Título da fonte: | Manancial - Repositório Digital da UFSM |
Texto Completo: | http://repositorio.ufsm.br/handle/1/7959 |
Resumo: | Calcination variables, temperature, time and heating rate, used in obtaining different transition aluminas were simultaneously investigated using statistical experimental design. Empirical models correlating catalyst final properties and calcination conditions were employed. It was found that all calcination variables play fundamental roles on acidity of alumina catalyst. Furthermore, interaction effects among these variables and non-linear effects also are of fundamental importance for the final properties catalyst. Therefore, the use of simultaneous variation of calcination conditions through experimental design is of great importance in detecting such interactions. It was observed that the use of high heating rates favor the formation of pore with larger diameters and with high pore volume and, for short calcination time, high heating rate also contributes to the formation of higher concentration of acid sites. The acid sites characterization of transition aluminas were performed by temperature programmed desorption of ammonia (NH3-DTP), which showed that there are two distinct acid sites on the surface these materials. The desorption dates were adjusted by a model in which the catalyst bed was considered as single continuously stirred tank reactor and the intrinsic kinetic was chosen to be of first order for adsorption and desorption. The ethanol conversion was higher for the alumina with higher acid sites concentration, suggesting a relationship between the activity of the alumina for the ethanol conversion and its acidity. The selectivity for the ethylene formation also was higher for the more acid aluminas, while the selectivity to ether presented opposite behavior. Therefore, a successful control of all calcination conditions can be an effective method to adjust the final physical and chemical properties of transition alumina catalyst, aiming the highest yield of ethylene from ethanol dehydration. |
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Produção de eteno a partir de etanol utilizando aluminasEthylene production from ethanol using aluminasCatáliseAluminaPlanejamento de experimentosCalcinaçãoPropriedades texturaisAcidezReação de desidratação de etanolEtenoCatalysisAluminaExperimental designCalcinationTextural propertiesCatalyst acidityEthanol dehydration reactionEthyleneCNPQ::ENGENHARIAS::ENGENHARIA DE PRODUCAOCalcination variables, temperature, time and heating rate, used in obtaining different transition aluminas were simultaneously investigated using statistical experimental design. Empirical models correlating catalyst final properties and calcination conditions were employed. It was found that all calcination variables play fundamental roles on acidity of alumina catalyst. Furthermore, interaction effects among these variables and non-linear effects also are of fundamental importance for the final properties catalyst. Therefore, the use of simultaneous variation of calcination conditions through experimental design is of great importance in detecting such interactions. It was observed that the use of high heating rates favor the formation of pore with larger diameters and with high pore volume and, for short calcination time, high heating rate also contributes to the formation of higher concentration of acid sites. The acid sites characterization of transition aluminas were performed by temperature programmed desorption of ammonia (NH3-DTP), which showed that there are two distinct acid sites on the surface these materials. The desorption dates were adjusted by a model in which the catalyst bed was considered as single continuously stirred tank reactor and the intrinsic kinetic was chosen to be of first order for adsorption and desorption. The ethanol conversion was higher for the alumina with higher acid sites concentration, suggesting a relationship between the activity of the alumina for the ethanol conversion and its acidity. The selectivity for the ethylene formation also was higher for the more acid aluminas, while the selectivity to ether presented opposite behavior. Therefore, a successful control of all calcination conditions can be an effective method to adjust the final physical and chemical properties of transition alumina catalyst, aiming the highest yield of ethylene from ethanol dehydration.Conselho Nacional de Desenvolvimento Científico e TecnológicoForam preparadas aluminas de transição investigando-se simultaneamente o efeito das variáveis de calcinação: temperatura, tempo e taxa de aquecimento, usando planejamento estatístico de experimentos. Modelos empíricos foram empregados para correlacionar as propriedades finais dos catalisadores às variáveis de calcinação. Foi observado que todas as variáveis de calcinação influenciam a concentração de sítios ácidos das aluminas. Além disso, efeitos de interação entre estas variáveis, bem como efeitos não lineares também são de fundamental importância para as propriedades finais deste catalisador. Estes efeitos só podem ser identificados com a variação simultânea das condições de calcinação através do uso do planejamento de experimentos. Foi observado que o uso de elevada taxa de aquecimento favorece a formação de aluminas com maior volume e tamanho de poros e, para curtos períodos de tempo de calcinação, elevada taxa de aquecimento também contribui para a formação de maior concentração de sítios ácidos. A caracterização dos sítios ácidos das aluminas foi realizada pela técnica de dessorção de amônia à temperatura programada (DTPNH3). Esta caracterização indicou a presença de dois tipos de sítios ácidos na superfície destes materiais. Os dados de dessorção foram ajustados por um modelo que considera a cinética de dessorção e readsorção como reações de primeira ordem em um modelo de reator de mistura perfeita. A conversão de etanol foi maior para as aluminas com maior concentração de sítios ácidos, indicando uma relação entre a atividade das aluminas para a conversão de etanol e sua acidez. A seletividade para a formação de eteno também foi maior para as aluminas mais ácidas, enquanto que a seletividade para éter exibiu comportamento inverso. Portanto, o controle adequado de todas as condições de calcinação pode ser um método eficiente para ajustar as propriedades físicas e químicas finais de aluminas de transição, visando obter maior rendimento na produção de eteno a partir da desidratação de etanol.Universidade Federal de Santa MariaBREngenharia de ProcessosUFSMPrograma de Pós-Graduação em Engenharia de ProcessosSchwaab, Marciohttp://lattes.cnpq.br/7572439258027513Coutinho, Elisa Barbosahttp://lattes.cnpq.br/0551304679934048Machado, Nadia Regina Camargo Fernandeshttp://lattes.cnpq.br/1173575311219493Pinto, José Carlos Costa da Silvahttp://lattes.cnpq.br/6479420970768737Ros, Simoní da2013-09-092013-09-092012-09-24info:eu-repo/semantics/publishedVersioninfo:eu-repo/semantics/masterThesisapplication/pdfapplication/pdfROS, Simoní da. ETHYLENE PRODUCTION FROM ETHANOL USING ALUMINAS. 2012. 138 f. Dissertação (Mestrado em Engenharia) - Universidade Federal de Santa Maria, Santa Maria, 2012.http://repositorio.ufsm.br/handle/1/7959porinfo:eu-repo/semantics/openAccessreponame:Manancial - Repositório Digital da UFSMinstname:Universidade Federal de Santa Maria (UFSM)instacron:UFSM2022-01-18T11:10:36Zoai:repositorio.ufsm.br:1/7959Biblioteca Digital de Teses e Dissertaçõeshttps://repositorio.ufsm.br/ONGhttps://repositorio.ufsm.br/oai/requestatendimento.sib@ufsm.br||tedebc@gmail.comopendoar:2022-01-18T11:10:36Manancial - Repositório Digital da UFSM - Universidade Federal de Santa Maria (UFSM)false |
dc.title.none.fl_str_mv |
Produção de eteno a partir de etanol utilizando aluminas Ethylene production from ethanol using aluminas |
title |
Produção de eteno a partir de etanol utilizando aluminas |
spellingShingle |
Produção de eteno a partir de etanol utilizando aluminas Ros, Simoní da Catálise Alumina Planejamento de experimentos Calcinação Propriedades texturais Acidez Reação de desidratação de etanol Eteno Catalysis Alumina Experimental design Calcination Textural properties Catalyst acidity Ethanol dehydration reaction Ethylene CNPQ::ENGENHARIAS::ENGENHARIA DE PRODUCAO |
title_short |
Produção de eteno a partir de etanol utilizando aluminas |
title_full |
Produção de eteno a partir de etanol utilizando aluminas |
title_fullStr |
Produção de eteno a partir de etanol utilizando aluminas |
title_full_unstemmed |
Produção de eteno a partir de etanol utilizando aluminas |
title_sort |
Produção de eteno a partir de etanol utilizando aluminas |
author |
Ros, Simoní da |
author_facet |
Ros, Simoní da |
author_role |
author |
dc.contributor.none.fl_str_mv |
Schwaab, Marcio http://lattes.cnpq.br/7572439258027513 Coutinho, Elisa Barbosa http://lattes.cnpq.br/0551304679934048 Machado, Nadia Regina Camargo Fernandes http://lattes.cnpq.br/1173575311219493 Pinto, José Carlos Costa da Silva http://lattes.cnpq.br/6479420970768737 |
dc.contributor.author.fl_str_mv |
Ros, Simoní da |
dc.subject.por.fl_str_mv |
Catálise Alumina Planejamento de experimentos Calcinação Propriedades texturais Acidez Reação de desidratação de etanol Eteno Catalysis Alumina Experimental design Calcination Textural properties Catalyst acidity Ethanol dehydration reaction Ethylene CNPQ::ENGENHARIAS::ENGENHARIA DE PRODUCAO |
topic |
Catálise Alumina Planejamento de experimentos Calcinação Propriedades texturais Acidez Reação de desidratação de etanol Eteno Catalysis Alumina Experimental design Calcination Textural properties Catalyst acidity Ethanol dehydration reaction Ethylene CNPQ::ENGENHARIAS::ENGENHARIA DE PRODUCAO |
description |
Calcination variables, temperature, time and heating rate, used in obtaining different transition aluminas were simultaneously investigated using statistical experimental design. Empirical models correlating catalyst final properties and calcination conditions were employed. It was found that all calcination variables play fundamental roles on acidity of alumina catalyst. Furthermore, interaction effects among these variables and non-linear effects also are of fundamental importance for the final properties catalyst. Therefore, the use of simultaneous variation of calcination conditions through experimental design is of great importance in detecting such interactions. It was observed that the use of high heating rates favor the formation of pore with larger diameters and with high pore volume and, for short calcination time, high heating rate also contributes to the formation of higher concentration of acid sites. The acid sites characterization of transition aluminas were performed by temperature programmed desorption of ammonia (NH3-DTP), which showed that there are two distinct acid sites on the surface these materials. The desorption dates were adjusted by a model in which the catalyst bed was considered as single continuously stirred tank reactor and the intrinsic kinetic was chosen to be of first order for adsorption and desorption. The ethanol conversion was higher for the alumina with higher acid sites concentration, suggesting a relationship between the activity of the alumina for the ethanol conversion and its acidity. The selectivity for the ethylene formation also was higher for the more acid aluminas, while the selectivity to ether presented opposite behavior. Therefore, a successful control of all calcination conditions can be an effective method to adjust the final physical and chemical properties of transition alumina catalyst, aiming the highest yield of ethylene from ethanol dehydration. |
publishDate |
2012 |
dc.date.none.fl_str_mv |
2012-09-24 2013-09-09 2013-09-09 |
dc.type.status.fl_str_mv |
info:eu-repo/semantics/publishedVersion |
dc.type.driver.fl_str_mv |
info:eu-repo/semantics/masterThesis |
format |
masterThesis |
status_str |
publishedVersion |
dc.identifier.uri.fl_str_mv |
ROS, Simoní da. ETHYLENE PRODUCTION FROM ETHANOL USING ALUMINAS. 2012. 138 f. Dissertação (Mestrado em Engenharia) - Universidade Federal de Santa Maria, Santa Maria, 2012. http://repositorio.ufsm.br/handle/1/7959 |
identifier_str_mv |
ROS, Simoní da. ETHYLENE PRODUCTION FROM ETHANOL USING ALUMINAS. 2012. 138 f. Dissertação (Mestrado em Engenharia) - Universidade Federal de Santa Maria, Santa Maria, 2012. |
url |
http://repositorio.ufsm.br/handle/1/7959 |
dc.language.iso.fl_str_mv |
por |
language |
por |
dc.rights.driver.fl_str_mv |
info:eu-repo/semantics/openAccess |
eu_rights_str_mv |
openAccess |
dc.format.none.fl_str_mv |
application/pdf application/pdf |
dc.publisher.none.fl_str_mv |
Universidade Federal de Santa Maria BR Engenharia de Processos UFSM Programa de Pós-Graduação em Engenharia de Processos |
publisher.none.fl_str_mv |
Universidade Federal de Santa Maria BR Engenharia de Processos UFSM Programa de Pós-Graduação em Engenharia de Processos |
dc.source.none.fl_str_mv |
reponame:Manancial - Repositório Digital da UFSM instname:Universidade Federal de Santa Maria (UFSM) instacron:UFSM |
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Universidade Federal de Santa Maria (UFSM) |
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UFSM |
institution |
UFSM |
reponame_str |
Manancial - Repositório Digital da UFSM |
collection |
Manancial - Repositório Digital da UFSM |
repository.name.fl_str_mv |
Manancial - Repositório Digital da UFSM - Universidade Federal de Santa Maria (UFSM) |
repository.mail.fl_str_mv |
atendimento.sib@ufsm.br||tedebc@gmail.com |
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1805922099721666560 |