Aplicação da síntese de fischer- tropsch
a review
DOI:
https://doi.org/10.14295/holos.v23i2.12496Palavras-chave:
Fischer-Tropsch, SBA-15, Cinza da casca de arroz, TEOS, Cobalto, Rutênio, Reator leito de lama.Resumo
Este trabalho teve como objetivo, desenvolver peneiras moleculares utilizando fontes de sílica alternativa (cinza da casca de arroz), utilizá-las como suportes para catalisadores de Cobalto destinados à síntese de FischerTropsch, e também, investigar o efeito da introdução de rutênio como promotor na reação acima mencionada. A reação de Fischer-Tropsch foi conduzida em reator leito de lama durante 6 horas de reação a 513K e pressão de 20 atm, utilizando uma relação molar H2/CO = 2. As análises de adsorção física de N2 das peneiras moleculares SBA-15 (CCA), mostram isotermas com perfil do tipo IV e histerese H1, características de materiais mesoporosos. As áreas superficiais específicas dos catalisadores diminuem e o volume de poro varia, devido ao bloqueio parcial dos poros pelo cobalto e pelo promotor rutênio, mas a estrutura da peneira molecular SBA-15 não é alterada. Os perfis de RTP dos catalisadores das séries Co/SBA-15 e Ru/Co/SBA-15 permitiram verificar a presença de picos distintos que pode ser causado pela redução dos óxidos de cobalto. A MET mostrou espécies de cobalto na forma esférica com tamanho de 20 nm, e após a co-impregnação com rutênio, houve uma melhor dispersão dessas espécies de cobalto. Os resultados obtidos a partir da síntese de FischerTropsch pelos catalisadores, apresentaram altas seletividades a hidrocarbonetos C5+ de alto valor agregado, bem como, verificou-se que a co-impregnação do promotor rutênio no catalisador Co/SBA-15, favoreceu o aumento da seletividade para hidrocarbonetos C5+ e diminuiu a seletividade para metano, com destaque para o desempenho do catalisador 0,5%Ru/SBA-15 preparado com as cinzas da casca de arroz, com rendimento de 88,2%.
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