Ethylbenzene production over platinum catalysts supported on modified KY zeolites

Detalhes bibliográficos
Autor(a) principal: Fonseca, Juliana da Silva Lima
Data de Publicação: 2010
Outros Autores: Faro Júnior, Arnaldo da Costa, Grau, Javier Mario, Varela, Maria do Carmo Rangel Santos
Tipo de documento: Artigo
Idioma: eng
Título da fonte: Repositório Institucional da UFBA
Texto Completo: http://www.repositorio.ufba.br/ri/handle/ri/5611
Resumo: Acesso restrito: Texto completo. p. 201-210.
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spelling Fonseca, Juliana da Silva LimaFaro Júnior, Arnaldo da CostaGrau, Javier MarioVarela, Maria do Carmo Rangel SantosFonseca, Juliana da Silva LimaFaro Júnior, Arnaldo da CostaGrau, Javier MarioVarela, Maria do Carmo Rangel Santos2012-04-12T19:15:09Z20100926-860Xhttp://www.repositorio.ufba.br/ri/handle/ri/5611v. 386, n. 1-2Acesso restrito: Texto completo. p. 201-210.Platinum catalysts supported on zeolite KY (Si/Al = 12.7), modified with magnesium, calcium or barium,were evaluated in n-octane reforming to produce ethylbenzene. The catalysts were characterized by nitrogen adsorption, 27Al and 29Si solid state nuclear magnetic resonance, Fourier transform infrared spectroscopy using carbon monoxide or pyridine, metal dispersion measurements and programmed temperature oxidation. No significant structural change was noted for the solids due to the dopants except for barium, which decreased the specific surface area, due to the partial blockage of the zeolite channels by the large size ions. However, a decrease was noted for all samples due to platinum, which partially blocked the zeolite channels. Barium also decreased the crystallinity while platinum caused this effect only for calcium and barium-containing samples, due to the structure partial collapse. Metallic platinum species in several electronic states were detected in the cages of zeolite, barium-containing catalyst showing the most electron-enriched platinum atoms. The amount of Lewis and Brønsted acid sites increased due to magnesium and calcium but barium increased only the amount of Lewis acid sites, as compared to potassium-containing solid. The catalysts with magnesium and barium showed the same platinum dispersion, which was higher than the one containing calcium. All catalysts were active in n-octane reforming at 723K and selective to ethylbenzene, but the conversion dropped with time reaction due to the decrease of specific surface area and to coke deposition. The calcium-containing sample produced the hardest coke, which led to the highest drop in conversion. The n-octane conversion was supposed to occur by a monofunctional mechanism but the bifunctional mechanism also seemed to occur due to the residual acidity of the catalysts. The calcium and barium-containing catalysts were the most selective to ethylbenzene, due to electron-enriched platinum species related to promoters, but the low ethylbenzene selectivity for the magnesium-containing catalyst was compensated by its high conversion, resulting in similar yields for all catalysts.Submitted by JURANDI DE SOUZA SILVA (jssufba@hotmail.com) on 2012-04-12T19:15:09Z No. of bitstreams: 1 __ac.els-cdn.com_S092686...5b817406ba7e2590b7db336478a27.pdf: 688197 bytes, checksum: ef2559e860bf5c3d412902fc50623d26 (MD5)Made available in DSpace on 2012-04-12T19:15:09Z (GMT). No. of bitstreams: 1 __ac.els-cdn.com_S092686...5b817406ba7e2590b7db336478a27.pdf: 688197 bytes, checksum: ef2559e860bf5c3d412902fc50623d26 (MD5) Previous issue date: 2010DOI: 10.1016/j.apcata.2010.07.056reponame:Repositório Institucional da UFBAinstname:Universidade Federal da Bahia (UFBA)instacron:UFBAn-Octane reformingY zeoliteEthylbenzeneCokeBariumCalciumMagnesiumEthylbenzene production over platinum catalysts supported on modified KY zeolitesApplied Catalysis A-Generalinfo:eu-repo/semantics/publishedVersioninfo:eu-repo/semantics/article10000-01-01enginfo:eu-repo/semantics/openAccessORIGINAL__ac.els-cdn.com_S092686...5b817406ba7e2590b7db336478a27.pdf__ac.els-cdn.com_S092686...5b817406ba7e2590b7db336478a27.pdfapplication/pdf688197https://repositorio.ufba.br/bitstream/ri/5611/1/__ac.els-cdn.com_S092686...5b817406ba7e2590b7db336478a27.pdfef2559e860bf5c3d412902fc50623d26MD51LICENSElicense.txtlicense.txttext/plain1762https://repositorio.ufba.br/bitstream/ri/5611/2/license.txt1b89a9a0548218172d7c829f87a0eab9MD52TEXT__ac.els-cdn.com_S092686...5b817406ba7e2590b7db336478a27.pdf.txt__ac.els-cdn.com_S092686...5b817406ba7e2590b7db336478a27.pdf.txtExtracted texttext/plain45022https://repositorio.ufba.br/bitstream/ri/5611/3/__ac.els-cdn.com_S092686...5b817406ba7e2590b7db336478a27.pdf.txtda0a7c9cc240f874ef2899b8fa9eb759MD53ri/56112022-07-05 14:03:28.619oai:repositorio.ufba.br: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Repositório InstitucionalPUBhttp://192.188.11.11:8080/oai/requestopendoar:19322022-07-05T17:03:28Repositório Institucional da UFBA - Universidade Federal da Bahia (UFBA)false
dc.title.pt_BR.fl_str_mv Ethylbenzene production over platinum catalysts supported on modified KY zeolites
dc.title.alternative.pt_BR.fl_str_mv Applied Catalysis A-General
title Ethylbenzene production over platinum catalysts supported on modified KY zeolites
spellingShingle Ethylbenzene production over platinum catalysts supported on modified KY zeolites
Fonseca, Juliana da Silva Lima
n-Octane reforming
Y zeolite
Ethylbenzene
Coke
Barium
Calcium
Magnesium
title_short Ethylbenzene production over platinum catalysts supported on modified KY zeolites
title_full Ethylbenzene production over platinum catalysts supported on modified KY zeolites
title_fullStr Ethylbenzene production over platinum catalysts supported on modified KY zeolites
title_full_unstemmed Ethylbenzene production over platinum catalysts supported on modified KY zeolites
title_sort Ethylbenzene production over platinum catalysts supported on modified KY zeolites
author Fonseca, Juliana da Silva Lima
author_facet Fonseca, Juliana da Silva Lima
Faro Júnior, Arnaldo da Costa
Grau, Javier Mario
Varela, Maria do Carmo Rangel Santos
author_role author
author2 Faro Júnior, Arnaldo da Costa
Grau, Javier Mario
Varela, Maria do Carmo Rangel Santos
author2_role author
author
author
dc.contributor.author.fl_str_mv Fonseca, Juliana da Silva Lima
Faro Júnior, Arnaldo da Costa
Grau, Javier Mario
Varela, Maria do Carmo Rangel Santos
Fonseca, Juliana da Silva Lima
Faro Júnior, Arnaldo da Costa
Grau, Javier Mario
Varela, Maria do Carmo Rangel Santos
dc.subject.por.fl_str_mv n-Octane reforming
Y zeolite
Ethylbenzene
Coke
Barium
Calcium
Magnesium
topic n-Octane reforming
Y zeolite
Ethylbenzene
Coke
Barium
Calcium
Magnesium
description Acesso restrito: Texto completo. p. 201-210.
publishDate 2010
dc.date.issued.fl_str_mv 2010
dc.date.accessioned.fl_str_mv 2012-04-12T19:15:09Z
dc.type.status.fl_str_mv info:eu-repo/semantics/publishedVersion
dc.type.driver.fl_str_mv info:eu-repo/semantics/article
format article
status_str publishedVersion
dc.identifier.uri.fl_str_mv http://www.repositorio.ufba.br/ri/handle/ri/5611
dc.identifier.issn.none.fl_str_mv 0926-860X
dc.identifier.number.pt_BR.fl_str_mv v. 386, n. 1-2
identifier_str_mv 0926-860X
v. 386, n. 1-2
url http://www.repositorio.ufba.br/ri/handle/ri/5611
dc.language.iso.fl_str_mv eng
language eng
dc.rights.driver.fl_str_mv info:eu-repo/semantics/openAccess
eu_rights_str_mv openAccess
dc.source.pt_BR.fl_str_mv DOI: 10.1016/j.apcata.2010.07.056
dc.source.none.fl_str_mv reponame:Repositório Institucional da UFBA
instname:Universidade Federal da Bahia (UFBA)
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