Reforma a vapor do etanol sobre catalisadores de Ni e Co suportados
Autor(a) principal: | |
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Data de Publicação: | 2004 |
Tipo de documento: | Dissertação |
Idioma: | por |
Título da fonte: | Repositório Institucional da UFSCAR |
Texto Completo: | https://repositorio.ufscar.br/handle/ufscar/4057 |
Resumo: | The Ni and Co catalysts supported on Al2O3 and 12%La-Al2O3 and the carrier 12%La-Al2O3 were prepared by impregnation of the support with an aqueous solution of corresponding nitrates metals. The catalysts were characterized by temperature programmed reduction (TPR), specific surface area (B.E.T.) and XRay Diffraction (XRD). The reaction rate for decomposition of ethanol in homogeneous phase becomes significant relative to the heterogeneous reaction at higher temperature (≥ 620ºC). The Ni/Al2O3 catalyst with higher Ni loading (15 wt.%) is active for dehydrogenation and hydrogenolysis of ethanol at temperatures lower than 500ºC, showing high selectivity to CH4 and CO. The rate to steam reforming of CH4 over Ni/Al2O3 catalyst became significant at temperature higher than 500ºC. The Co/Al2O3 catalyst with high Co loading (12 wt %) is mainly active for dehydrogenation at temperatures lower than 480ºC, showing high selectivity to steam reforming of ethanol, forming predominantly CO2. The selectivity to CH4 was suppressed on La-containing catalysts (Ni/La-Al2O3 and Co/La-Al2O3). The decreasing Co loading from 12 to 1 wt % in the Co/La-Al2O3 catalyst provides a decreasing on the selectivity to dehydrogenization of ethanol. The La-Al2O3 support shows active sites for dehydrogenation of ethanol, these sites are blocked increasing the Co loading. The Ni and Co catalysts show activity for carbon deposition. The addition of the promoters Ag and Sn have no positive effect to suppress the carbon deposition. The carbon deposition was suppressed increasing water/ethanol ratio up to stoichiometric ratio. |
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Liberatori, Janete Werle de CamargoBueno, José Maria Corrêahttp://lattes.cnpq.br/0157452280626031http://genos.cnpq.br:12010/dwlattes/owa/prc_imp_cv_int?f_cod=K4769386Y407d43b3d-181e-4090-b6ae-111accab12382016-06-02T19:56:41Z2005-01-062016-06-02T19:56:41Z2004-08-17LIBERATORI, Janete Werle de Camargo. Reforma a vapor do etanol sobre catalisadores de Ni e Co suportados.. 2004. 125 f. Dissertação (Mestrado em Ciências Exatas e da Terra) - Universidade Federal de São Carlos, São Carlos, 2004.https://repositorio.ufscar.br/handle/ufscar/4057The Ni and Co catalysts supported on Al2O3 and 12%La-Al2O3 and the carrier 12%La-Al2O3 were prepared by impregnation of the support with an aqueous solution of corresponding nitrates metals. The catalysts were characterized by temperature programmed reduction (TPR), specific surface area (B.E.T.) and XRay Diffraction (XRD). The reaction rate for decomposition of ethanol in homogeneous phase becomes significant relative to the heterogeneous reaction at higher temperature (≥ 620ºC). The Ni/Al2O3 catalyst with higher Ni loading (15 wt.%) is active for dehydrogenation and hydrogenolysis of ethanol at temperatures lower than 500ºC, showing high selectivity to CH4 and CO. The rate to steam reforming of CH4 over Ni/Al2O3 catalyst became significant at temperature higher than 500ºC. The Co/Al2O3 catalyst with high Co loading (12 wt %) is mainly active for dehydrogenation at temperatures lower than 480ºC, showing high selectivity to steam reforming of ethanol, forming predominantly CO2. The selectivity to CH4 was suppressed on La-containing catalysts (Ni/La-Al2O3 and Co/La-Al2O3). The decreasing Co loading from 12 to 1 wt % in the Co/La-Al2O3 catalyst provides a decreasing on the selectivity to dehydrogenization of ethanol. The La-Al2O3 support shows active sites for dehydrogenation of ethanol, these sites are blocked increasing the Co loading. The Ni and Co catalysts show activity for carbon deposition. The addition of the promoters Ag and Sn have no positive effect to suppress the carbon deposition. The carbon deposition was suppressed increasing water/ethanol ratio up to stoichiometric ratio.Os catalisadores de Ni e Co suportados em Al2O3 e 12%La-Al2O3 e o suporte 12%La-Al2O3 foram preparados pelo processo de impregnação com solução aquosa de nitrato destes metais. Os catalisadores foram caracterizados por redução à temperatura programada (TPR), área superficial específica (B.E.T.) e por difração de Raios X (DRX). A velocidade da reação de decomposição do etanol em fase homogênea torna-se significativa em relação à reação heterogênea em temperaturas superiores a 620ºC. O catalisador de Ni/Al2O3 com alta carga de Ni (15%) é ativo para desidrogenação e hidrogenólise em temperaturas <500ºC, apresentando alta seletividade para formação de CH4 e CO. Em temperatura >500ºC tem-se a reforma a vapor do CH4 formado. Os catalisadores de Co/Al2O3 com alta carga de Co (12%) são ativos para desidrogenação em temperaturas <480ºC, apresentando alta seletividade para reforma do etanol, formando predominantemente CO2. A presença La nos catalisadores de Ni-Al2O3 e Co- Al2O3 suprime a atividade e seletividade para formação de CH4. O decréscimo do teor de Co de 12 para 1 % nos catalisadores de Co/La-Al2O3 proporciona um decréscimo na seletividade para desidrogenação do etanol em baixa temperatura, por outro lado proporciona maior exposição da área do suporte La-Al2O3 , o qual é ativo para desidratação do etanol. Os catalisadores de Ni ou Co apresentaram alta atividade para deposição de carbono. As adições de promotores Ag e Sn não resultaram em efeito positivo para suprimir a deposição de carbono. O aumento na razão água/etanol mostrou-se como a principal forma para inibir a deposição de carbono sobre estes catalisadores.Universidade Federal de Sao Carlosapplication/pdfporUniversidade Federal de São CarlosPrograma de Pós-Graduação em Engenharia Química - PPGEQUFSCarBRCatáliseReforma a vaporÁlcoolNíquelCobaltoENGENHARIAS::ENGENHARIA QUIMICAReforma a vapor do etanol sobre catalisadores de Ni e Co suportadosinfo:eu-repo/semantics/publishedVersioninfo:eu-repo/semantics/masterThesis-1-13b275236-acc5-4218-a33b-8f802e7f5a18info:eu-repo/semantics/openAccessreponame:Repositório Institucional da UFSCARinstname:Universidade Federal de São Carlos (UFSCAR)instacron:UFSCARORIGINALDissJWCL.pdfapplication/pdf949150https://repositorio.ufscar.br/bitstream/ufscar/4057/1/DissJWCL.pdf72ae4b3857dd6949cc748eba54ce7acbMD51THUMBNAILDissJWCL.pdf.jpgDissJWCL.pdf.jpgIM Thumbnailimage/jpeg7532https://repositorio.ufscar.br/bitstream/ufscar/4057/2/DissJWCL.pdf.jpgfe66896a96e013552e1edea833fd3e07MD52ufscar/40572023-09-18 18:32:19.105oai:repositorio.ufscar.br:ufscar/4057Repositório InstitucionalPUBhttps://repositorio.ufscar.br/oai/requestopendoar:43222023-09-18T18:32:19Repositório Institucional da UFSCAR - Universidade Federal de São Carlos (UFSCAR)false |
dc.title.por.fl_str_mv |
Reforma a vapor do etanol sobre catalisadores de Ni e Co suportados |
title |
Reforma a vapor do etanol sobre catalisadores de Ni e Co suportados |
spellingShingle |
Reforma a vapor do etanol sobre catalisadores de Ni e Co suportados Liberatori, Janete Werle de Camargo Catálise Reforma a vapor Álcool Níquel Cobalto ENGENHARIAS::ENGENHARIA QUIMICA |
title_short |
Reforma a vapor do etanol sobre catalisadores de Ni e Co suportados |
title_full |
Reforma a vapor do etanol sobre catalisadores de Ni e Co suportados |
title_fullStr |
Reforma a vapor do etanol sobre catalisadores de Ni e Co suportados |
title_full_unstemmed |
Reforma a vapor do etanol sobre catalisadores de Ni e Co suportados |
title_sort |
Reforma a vapor do etanol sobre catalisadores de Ni e Co suportados |
author |
Liberatori, Janete Werle de Camargo |
author_facet |
Liberatori, Janete Werle de Camargo |
author_role |
author |
dc.contributor.authorlattes.por.fl_str_mv |
http://genos.cnpq.br:12010/dwlattes/owa/prc_imp_cv_int?f_cod=K4769386Y4 |
dc.contributor.author.fl_str_mv |
Liberatori, Janete Werle de Camargo |
dc.contributor.advisor1.fl_str_mv |
Bueno, José Maria Corrêa |
dc.contributor.advisor1Lattes.fl_str_mv |
http://lattes.cnpq.br/0157452280626031 |
dc.contributor.authorID.fl_str_mv |
07d43b3d-181e-4090-b6ae-111accab1238 |
contributor_str_mv |
Bueno, José Maria Corrêa |
dc.subject.por.fl_str_mv |
Catálise Reforma a vapor Álcool Níquel Cobalto |
topic |
Catálise Reforma a vapor Álcool Níquel Cobalto ENGENHARIAS::ENGENHARIA QUIMICA |
dc.subject.cnpq.fl_str_mv |
ENGENHARIAS::ENGENHARIA QUIMICA |
description |
The Ni and Co catalysts supported on Al2O3 and 12%La-Al2O3 and the carrier 12%La-Al2O3 were prepared by impregnation of the support with an aqueous solution of corresponding nitrates metals. The catalysts were characterized by temperature programmed reduction (TPR), specific surface area (B.E.T.) and XRay Diffraction (XRD). The reaction rate for decomposition of ethanol in homogeneous phase becomes significant relative to the heterogeneous reaction at higher temperature (≥ 620ºC). The Ni/Al2O3 catalyst with higher Ni loading (15 wt.%) is active for dehydrogenation and hydrogenolysis of ethanol at temperatures lower than 500ºC, showing high selectivity to CH4 and CO. The rate to steam reforming of CH4 over Ni/Al2O3 catalyst became significant at temperature higher than 500ºC. The Co/Al2O3 catalyst with high Co loading (12 wt %) is mainly active for dehydrogenation at temperatures lower than 480ºC, showing high selectivity to steam reforming of ethanol, forming predominantly CO2. The selectivity to CH4 was suppressed on La-containing catalysts (Ni/La-Al2O3 and Co/La-Al2O3). The decreasing Co loading from 12 to 1 wt % in the Co/La-Al2O3 catalyst provides a decreasing on the selectivity to dehydrogenization of ethanol. The La-Al2O3 support shows active sites for dehydrogenation of ethanol, these sites are blocked increasing the Co loading. The Ni and Co catalysts show activity for carbon deposition. The addition of the promoters Ag and Sn have no positive effect to suppress the carbon deposition. The carbon deposition was suppressed increasing water/ethanol ratio up to stoichiometric ratio. |
publishDate |
2004 |
dc.date.issued.fl_str_mv |
2004-08-17 |
dc.date.available.fl_str_mv |
2005-01-06 2016-06-02T19:56:41Z |
dc.date.accessioned.fl_str_mv |
2016-06-02T19:56:41Z |
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.citation.fl_str_mv |
LIBERATORI, Janete Werle de Camargo. Reforma a vapor do etanol sobre catalisadores de Ni e Co suportados.. 2004. 125 f. Dissertação (Mestrado em Ciências Exatas e da Terra) - Universidade Federal de São Carlos, São Carlos, 2004. |
dc.identifier.uri.fl_str_mv |
https://repositorio.ufscar.br/handle/ufscar/4057 |
identifier_str_mv |
LIBERATORI, Janete Werle de Camargo. Reforma a vapor do etanol sobre catalisadores de Ni e Co suportados.. 2004. 125 f. Dissertação (Mestrado em Ciências Exatas e da Terra) - Universidade Federal de São Carlos, São Carlos, 2004. |
url |
https://repositorio.ufscar.br/handle/ufscar/4057 |
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por |
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-1 -1 |
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openAccess |
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Universidade Federal de São Carlos |
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Programa de Pós-Graduação em Engenharia Química - PPGEQ |
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UFSCar |
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BR |
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Universidade Federal de São Carlos |
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