Catalisadores a base de Cu, Ni e Mg suportados em Al2O3 aplicados à gaseificação de etanol em meio contendo água em condições supercríticas
Ano de defesa: | 2018 |
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Autor(a) principal: | |
Orientador(a): | |
Banca de defesa: | , , , |
Tipo de documento: | Dissertação |
Tipo de acesso: | Acesso aberto |
Idioma: | por |
Instituição de defesa: |
Universidade Federal de Goiás
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Programa de Pós-Graduação: |
Programa de Pós-graduação em Engenharia Química (IQ)
|
Departamento: |
Instituto de Química - IQ (RG)
|
País: |
Brasil
|
Palavras-chave em Português: | |
Palavras-chave em Inglês: | |
Área do conhecimento CNPq: | |
Link de acesso: | http://repositorio.bc.ufg.br/tede/handle/tede/8981 |
Resumo: | In this work the synthesis of catalysts was carried out with the objective of H2 production from gasification of ethanol in medium containing water under supercritical conditions. Based on reports from the literature, Cu, Ni and Mg were selected as components for the active phase, alumina (Al2O3) as catalysts support. The catalysts were prepared from aqueous solutions of nitrate salts precursors of Cu, Ni and Mg. The catalysts were characterized by X-ray fluorescence (FRX), scanning electron microscopy, thermogravimetric and thermal differential analysis (TG/ATD), X-ray diffraction (DRX) and textural analysis by N2 adsorption / desorption isotherms at -196 ° C. The TG/ATD analysis indicated that the calcination of the catalytic precursors was sufficient for the removal of water and decomposition of the nitrates of the metal salts precursors of the active phase. In the FRX analysis, the increase in the concentration of the metals in relation to the nominal values after the synthesis of the catalysts was characterized, with an increase of 20 to 40% depending on the metal due to the loss of water from the alumina support. The FRX analysis of the catalysts used in the catalytic tests shows that there was no significant leaching during the gasification process. DRX analysis have characteristic results that the metals are in amorphous form or dispersed in the form of small crystallites. Textural analysis of N2 adsorption / desorption isotherms indicated a reduction of approximately 60% in the specific surface area between the alumina and the calcined alumina and the specific area values between the alumina and the metal catalysts were kept close. The catalytic tests were performed at a pressure of 25 MPa and at temperatures of 400 to 650 ° C. A 10/1 molar water / ethanol solution was fed. In the catalytic tests H2, CH4, CO, CO2, C2H4, C2H6, C2H4O were obtained. The highest ethanol conversions were obtained at the temperature of 650 ° C for the catalysts NiO/Al2O3 and NiO-MgO/Al2O3, both 81%. The highest yield was 0.41 mol H2 / mol ethanol fed to the NiO / Al2O3 catalyst, at a temperature of 600 ° C. The highest selectivity at the temperature of 600 ° C was 39%, obtained by the NiO/Al2O3 catalyst. |
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Alonso, Christian Gonçalveshttp://lattes.cnpq.br/7285754665946583Souza, Thiago Leandro dehttp://lattes.cnpq.br/7431199944070783Alonso, Christian GonçalvesSouza, Thiago Leandro deSantos, Dyrney Araújo dosQueiroz Júnior, Luiz Henrique Kenghttp://lattes.cnpq.br/4844908737272285Melo, Jarbas Almeida de2018-10-16T10:13:44Z2018-09-28MELO, J. A. Catalisadores a base de Cu, Ni e Mg suportados em Al2O3 aplicados à gaseificação de etanol em meio contendo água em condições supercríticas. 2018. 92 f. Dissertação (Mestrado em Engenharia Química) - Universidade Federal de Goiás, Goiânia, 2018.http://repositorio.bc.ufg.br/tede/handle/tede/8981In this work the synthesis of catalysts was carried out with the objective of H2 production from gasification of ethanol in medium containing water under supercritical conditions. Based on reports from the literature, Cu, Ni and Mg were selected as components for the active phase, alumina (Al2O3) as catalysts support. The catalysts were prepared from aqueous solutions of nitrate salts precursors of Cu, Ni and Mg. The catalysts were characterized by X-ray fluorescence (FRX), scanning electron microscopy, thermogravimetric and thermal differential analysis (TG/ATD), X-ray diffraction (DRX) and textural analysis by N2 adsorption / desorption isotherms at -196 ° C. The TG/ATD analysis indicated that the calcination of the catalytic precursors was sufficient for the removal of water and decomposition of the nitrates of the metal salts precursors of the active phase. In the FRX analysis, the increase in the concentration of the metals in relation to the nominal values after the synthesis of the catalysts was characterized, with an increase of 20 to 40% depending on the metal due to the loss of water from the alumina support. The FRX analysis of the catalysts used in the catalytic tests shows that there was no significant leaching during the gasification process. DRX analysis have characteristic results that the metals are in amorphous form or dispersed in the form of small crystallites. Textural analysis of N2 adsorption / desorption isotherms indicated a reduction of approximately 60% in the specific surface area between the alumina and the calcined alumina and the specific area values between the alumina and the metal catalysts were kept close. The catalytic tests were performed at a pressure of 25 MPa and at temperatures of 400 to 650 ° C. A 10/1 molar water / ethanol solution was fed. In the catalytic tests H2, CH4, CO, CO2, C2H4, C2H6, C2H4O were obtained. The highest ethanol conversions were obtained at the temperature of 650 ° C for the catalysts NiO/Al2O3 and NiO-MgO/Al2O3, both 81%. The highest yield was 0.41 mol H2 / mol ethanol fed to the NiO / Al2O3 catalyst, at a temperature of 600 ° C. The highest selectivity at the temperature of 600 ° C was 39%, obtained by the NiO/Al2O3 catalyst.Neste trabalho foi realizada a síntese de catalisadores com o objetivo da produção de H2 a partir da gaseificação de etanol em meio contendo água em condições supercríticas. A partir de relatos da literatura, foram selecionados Cu, Ni e Mg como componentes para a fase ativa e a alumina (Al2O3) como suporte dos catalisadores. Os catalisadores foram preparados a partir de soluções aquosas de sais de nitrato precursores de Cu, Ni e Mg. Os catalisadores foram caracterizados por fluorescência de raios X (FRX), microscopia eletrônica de varredura (MEV), análises termogravimétrica e térmica diferencial simultânea (TG/ATD), difração de raios X (DRX) e análise textural por isotermas de adsorção/dessorção de N2 a -196°C. As análises de TG/ATD indicaram que a calcinação dos precursores catalíticos foi suficiente para a remoção da água e decomposição dos nitratos dos sais metálicos precursores da fase ativa. Nas análises de FRX ficou caracterizado o aumento da concentração dos metais em relação aos valores nominais, após a síntese dos catalisadores, com acréscimo de 20 a 40 % dependendo do metal, devido à perda de água do suporte de alumina. As análises FRX dos catalisadores utiilzados nos testes catalíticos mostraram que não houve lixiviação considerável durante o processo de gaseificação. Análises de DRX apresentaram resultados característicos de que os metais se encontram na forma amorfa ou dispersos na forma de pequenos cristalitos. Os resultados foram coerentes com as imagens de microscopia eletrônica de varredura. Análises textural por isotermas de adsorção/dessorção de N2 indicaram uma redução de aproximadamente 60% na área superficial específica entre a alumina e a alumina calcinada e mantiveram-se próximos os valores de área específica entre a alumina e os catalisadores metálicos. Os testes catalíticos foram realizados a uma pressão de 25 MPa e nas temperaturas de 400 a 650 °C. Foi alimentada uma solução de água/etanol na razão de 10/1 molar. Nos testes catalíticos foram obtidos H2, CH4, CO, CO2, C2H4, C2H6, C2H4O. As maiores conversões de etanol foram obtidas na temperatura de 650 °C para os catalisadores de NiO/Al2O3 e NiO-MgO/Al2O3, ambas 81 %. O maior rendimento obtido foi de 0,41 mol H2/mol etanol alimentado para o catalisador de NiO/ Al2O3, na temperatura de 600 °C. A maior seletividade na temperatura de 600 °C foi de 39 %, obtida pelo catalisador de NiO/Al2O3.Submitted by Liliane Ferreira (ljuvencia30@gmail.com) on 2018-10-15T15:41:01Z No. of bitstreams: 2 Dissertação - Jarbas Almeida de Melo - 2018.pdf: 7287109 bytes, checksum: 8e33ba1a3ef2d679e03ecdb4e368b53c (MD5) license_rdf: 0 bytes, checksum: d41d8cd98f00b204e9800998ecf8427e (MD5)Approved for entry into archive by Luciana Ferreira (lucgeral@gmail.com) on 2018-10-16T10:13:44Z (GMT) No. of bitstreams: 2 Dissertação - Jarbas Almeida de Melo - 2018.pdf: 7287109 bytes, checksum: 8e33ba1a3ef2d679e03ecdb4e368b53c (MD5) license_rdf: 0 bytes, checksum: d41d8cd98f00b204e9800998ecf8427e (MD5)Made available in DSpace on 2018-10-16T10:13:44Z (GMT). No. of bitstreams: 2 Dissertação - Jarbas Almeida de Melo - 2018.pdf: 7287109 bytes, checksum: 8e33ba1a3ef2d679e03ecdb4e368b53c (MD5) license_rdf: 0 bytes, checksum: d41d8cd98f00b204e9800998ecf8427e (MD5) Previous issue date: 2018-09-28Coordenação de Aperfeiçoamento de Pessoal de Nível Superior - CAPESapplication/pdfporUniversidade Federal de GoiásPrograma de Pós-graduação em Engenharia Química (IQ)UFGBrasilInstituto de Química - IQ (RG)http://creativecommons.org/licenses/by-nc-nd/4.0/info:eu-repo/semantics/openAccessHidrogênioGaseificação em água supercríticaAluminaEtanolCatalisadores a base de cobreNíquelMagnésioHydrogenSupercritical water gasificationAluminaEthanolCatalysts based on copperNickelNagnesiumENGENHARIAS::ENGENHARIA QUIMICACatalisadores a base de Cu, Ni e Mg suportados em Al2O3 aplicados à gaseificação de etanol em meio contendo água em condições supercríticasCatalysts based on Cu, Ni AND Mg supported in Al2O3 applied to etanol gasification in medium containing water in supercritical conditionsinfo:eu-repo/semantics/publishedVersioninfo:eu-repo/semantics/masterThesis34814965011584600786006006006007826066743741197278-18486402610968708782075167498588264571reponame:Biblioteca Digital de Teses e Dissertações da UFGinstname:Universidade Federal de Goiás (UFG)instacron:UFGLICENSElicense.txtlicense.txttext/plain; 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dc.title.eng.fl_str_mv |
Catalisadores a base de Cu, Ni e Mg suportados em Al2O3 aplicados à gaseificação de etanol em meio contendo água em condições supercríticas |
dc.title.alternative.eng.fl_str_mv |
Catalysts based on Cu, Ni AND Mg supported in Al2O3 applied to etanol gasification in medium containing water in supercritical conditions |
title |
Catalisadores a base de Cu, Ni e Mg suportados em Al2O3 aplicados à gaseificação de etanol em meio contendo água em condições supercríticas |
spellingShingle |
Catalisadores a base de Cu, Ni e Mg suportados em Al2O3 aplicados à gaseificação de etanol em meio contendo água em condições supercríticas Melo, Jarbas Almeida de Hidrogênio Gaseificação em água supercrítica Alumina Etanol Catalisadores a base de cobre Níquel Magnésio Hydrogen Supercritical water gasification Alumina Ethanol Catalysts based on copper Nickel Nagnesium ENGENHARIAS::ENGENHARIA QUIMICA |
title_short |
Catalisadores a base de Cu, Ni e Mg suportados em Al2O3 aplicados à gaseificação de etanol em meio contendo água em condições supercríticas |
title_full |
Catalisadores a base de Cu, Ni e Mg suportados em Al2O3 aplicados à gaseificação de etanol em meio contendo água em condições supercríticas |
title_fullStr |
Catalisadores a base de Cu, Ni e Mg suportados em Al2O3 aplicados à gaseificação de etanol em meio contendo água em condições supercríticas |
title_full_unstemmed |
Catalisadores a base de Cu, Ni e Mg suportados em Al2O3 aplicados à gaseificação de etanol em meio contendo água em condições supercríticas |
title_sort |
Catalisadores a base de Cu, Ni e Mg suportados em Al2O3 aplicados à gaseificação de etanol em meio contendo água em condições supercríticas |
author |
Melo, Jarbas Almeida de |
author_facet |
Melo, Jarbas Almeida de |
author_role |
author |
dc.contributor.advisor1.fl_str_mv |
Alonso, Christian Gonçalves |
dc.contributor.advisor1Lattes.fl_str_mv |
http://lattes.cnpq.br/7285754665946583 |
dc.contributor.advisor-co1.fl_str_mv |
Souza, Thiago Leandro de |
dc.contributor.advisor-co1Lattes.fl_str_mv |
http://lattes.cnpq.br/7431199944070783 |
dc.contributor.referee1.fl_str_mv |
Alonso, Christian Gonçalves |
dc.contributor.referee2.fl_str_mv |
Souza, Thiago Leandro de |
dc.contributor.referee3.fl_str_mv |
Santos, Dyrney Araújo dos |
dc.contributor.referee4.fl_str_mv |
Queiroz Júnior, Luiz Henrique Keng |
dc.contributor.authorLattes.fl_str_mv |
http://lattes.cnpq.br/4844908737272285 |
dc.contributor.author.fl_str_mv |
Melo, Jarbas Almeida de |
contributor_str_mv |
Alonso, Christian Gonçalves Souza, Thiago Leandro de Alonso, Christian Gonçalves Souza, Thiago Leandro de Santos, Dyrney Araújo dos Queiroz Júnior, Luiz Henrique Keng |
dc.subject.por.fl_str_mv |
Hidrogênio Gaseificação em água supercrítica Alumina Etanol Catalisadores a base de cobre Níquel Magnésio |
topic |
Hidrogênio Gaseificação em água supercrítica Alumina Etanol Catalisadores a base de cobre Níquel Magnésio Hydrogen Supercritical water gasification Alumina Ethanol Catalysts based on copper Nickel Nagnesium ENGENHARIAS::ENGENHARIA QUIMICA |
dc.subject.eng.fl_str_mv |
Hydrogen Supercritical water gasification Alumina Ethanol Catalysts based on copper Nickel Nagnesium |
dc.subject.cnpq.fl_str_mv |
ENGENHARIAS::ENGENHARIA QUIMICA |
description |
In this work the synthesis of catalysts was carried out with the objective of H2 production from gasification of ethanol in medium containing water under supercritical conditions. Based on reports from the literature, Cu, Ni and Mg were selected as components for the active phase, alumina (Al2O3) as catalysts support. The catalysts were prepared from aqueous solutions of nitrate salts precursors of Cu, Ni and Mg. The catalysts were characterized by X-ray fluorescence (FRX), scanning electron microscopy, thermogravimetric and thermal differential analysis (TG/ATD), X-ray diffraction (DRX) and textural analysis by N2 adsorption / desorption isotherms at -196 ° C. The TG/ATD analysis indicated that the calcination of the catalytic precursors was sufficient for the removal of water and decomposition of the nitrates of the metal salts precursors of the active phase. In the FRX analysis, the increase in the concentration of the metals in relation to the nominal values after the synthesis of the catalysts was characterized, with an increase of 20 to 40% depending on the metal due to the loss of water from the alumina support. The FRX analysis of the catalysts used in the catalytic tests shows that there was no significant leaching during the gasification process. DRX analysis have characteristic results that the metals are in amorphous form or dispersed in the form of small crystallites. Textural analysis of N2 adsorption / desorption isotherms indicated a reduction of approximately 60% in the specific surface area between the alumina and the calcined alumina and the specific area values between the alumina and the metal catalysts were kept close. The catalytic tests were performed at a pressure of 25 MPa and at temperatures of 400 to 650 ° C. A 10/1 molar water / ethanol solution was fed. In the catalytic tests H2, CH4, CO, CO2, C2H4, C2H6, C2H4O were obtained. The highest ethanol conversions were obtained at the temperature of 650 ° C for the catalysts NiO/Al2O3 and NiO-MgO/Al2O3, both 81%. The highest yield was 0.41 mol H2 / mol ethanol fed to the NiO / Al2O3 catalyst, at a temperature of 600 ° C. The highest selectivity at the temperature of 600 ° C was 39%, obtained by the NiO/Al2O3 catalyst. |
publishDate |
2018 |
dc.date.accessioned.fl_str_mv |
2018-10-16T10:13:44Z |
dc.date.issued.fl_str_mv |
2018-09-28 |
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 |
MELO, J. A. Catalisadores a base de Cu, Ni e Mg suportados em Al2O3 aplicados à gaseificação de etanol em meio contendo água em condições supercríticas. 2018. 92 f. Dissertação (Mestrado em Engenharia Química) - Universidade Federal de Goiás, Goiânia, 2018. |
dc.identifier.uri.fl_str_mv |
http://repositorio.bc.ufg.br/tede/handle/tede/8981 |
identifier_str_mv |
MELO, J. A. Catalisadores a base de Cu, Ni e Mg suportados em Al2O3 aplicados à gaseificação de etanol em meio contendo água em condições supercríticas. 2018. 92 f. Dissertação (Mestrado em Engenharia Química) - Universidade Federal de Goiás, Goiânia, 2018. |
url |
http://repositorio.bc.ufg.br/tede/handle/tede/8981 |
dc.language.iso.fl_str_mv |
por |
language |
por |
dc.relation.program.fl_str_mv |
3481496501158460078 |
dc.relation.confidence.fl_str_mv |
600 600 600 600 |
dc.relation.department.fl_str_mv |
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