Synthesis and characterization of bifunctional transition-metal/silica-alumina catalysts for the chloromethane conversion to hydrocarbons

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dc.contributor.authorRojas, Leopoldo Osvaldo Alcazar
dc.contributor.authorNascimento, José Carlos
dc.contributor.authorRuiz, Juan Alberto Chavez
dc.contributor.authorBenachour, Monhad
dc.contributor.authorSousa, João Fernandes de
dc.date.accessioned2021-09-29T19:32:33Z
dc.date.available2021-09-29T19:32:33Z
dc.date.issued2008
dc.description.resumoIn this work bifunctional (metal-acid) catalysts of Fe, Ni, Fe2O3 and NiO over amorphous silica alumina support were characterized (acidity) and evaluated for the conversion of chloromethane in a fixed bed reactor. Temperature program tests TPD (Temperature Programmed Desorption) and TPR (Temperature Programmed Reduction) were performed to characterize the quimissorption sites for the impregnated and unimpregnated support. New adsorption sites were created on the metal supported catalysts. The conversion yield of chloromethane was evaluated for the five materials. The highest conversion conversion (85%) was observed for the unmodified support (SiAl) after 6 of reaction at 860 K and a WHSV (Weight Hourly Space Velocity) of 4,5 h-1. The best selectivity toward desirable hydrocarbons (C3, C4) was found for the Fe-SiAl catalyst. C3 was also found in the products stream when Ni/SiAl and NiO/SiAl catalyts were tested. Ni catalysts were the most favorable to methane production. The catalytic tests showed coke formation in all materials. For the SiAl support the desorption energy of chloromethane, determined by TPD runs, was 101,9 KJ/mol. The metals presented lower desorption energies (75,2 KJ/mol for Ni and 133,4 KJ/mol for Fe) than the oxides (190,1 KJ/mol for Fe2O3 and 322,4 KJ/mol for NiO)pt_BR
dc.identifier.citationROJAS, Leopoldo Osvaldo Alcazar ; Nascimento, José Carlos ; Ruiz ; BENACHOUR, Mohand ; SOUSA, J. F. . Synthesis and characterization of bifunctional transition-metal/silica-alumina catalysts for the chloromethane conversion to hydrocarbons. Brazilian Journal of Petroleum and Gas, v. 2, p. 154-166, 2008. Disponível em: http://www.portalabpg.org.br/bjpg/index.php/bjpg/article/view/59. Acesso em: 29 set. 2021.pt_BR
dc.identifier.issn1982-0593
dc.identifier.urihttps://repositorio.ufrn.br/handle/123456789/40837
dc.languageenpt_BR
dc.publisherABPGpt_BR
dc.subjectFixed-bed reactorpt_BR
dc.subjectDesorption energypt_BR
dc.subjectChloromethanept_BR
dc.subjectOlefinspt_BR
dc.subjectSilica aluminapt_BR
dc.titleSynthesis and characterization of bifunctional transition-metal/silica-alumina catalysts for the chloromethane conversion to hydrocarbonspt_BR
dc.typearticlept_BR

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