Catalisadores à base de ferrita de cobalto dispersos em MCM-41 foram sintetizados com sucesso e aplicados na conversão de etilbenzeno em estireno. Os sítios ativos na estrutura de ferrita de cobalto são mais promissores para a transformação do etilbenzeno em estireno em comparação com os sítios tradicionais presentes na estrutura da hematita. Foi obtida uma ferrita parcialmente invertida com estrutura (Co0.06Fe0.94) [Co0.94Fe1.06] O4, onde Co2 + e Fe3+ ocupam
posições octaédricas e tetraédricas na rede cristalina. Testes catalíticos mostraram alta seletividade e estabilidade para a fase CoFe2O4, o que é atribuído à alta estabilidade estrutural
contra as condições de reação em comparação com a hematita (baixa estabilidade estrutural). A proposta mecanística mostrou que o etilbenzeno é atraído principalmente nos sítios Fe3+ em comparação ao Co2+, assim como a desidrogenação ocorre preferencialmente em sítios
102
confirmou que o processo catalítico para a desidrogenação do etilbenzeno ocorre preferencialmente em sítio de ferro e oxigênio da rede localizados em posições octaédricas, mas os sítios de cobalto e as posições tetraédricas na estrutura de ferrita de cobalto não podem ser completamente negligenciados.
O CO2 como oxidante fraco proporcionou maior atividade catalítica para a reação de
desidrogenação oxidativa do etilbenzeno utilizando catalisador a base de ferrita de cobalto em comparação com a reação na ausência de dióxido de carbono. O CO2 tem a capacidade de
regenerar os sítios de Fe3+ presentes na ferrita de acordo com a caracterização antes da reação, após a reação na presença e ausência de CO2, enquanto para a reação na ausência de CO2 a
ferrita de cobalto foi reduzida a magnetita causando uma diminuição no desempenho catalítico. A quantidade de coque depositada na superfície do catalisador foi menor para a reação na presença de CO2 em relação à reação na presença de N2, confirmando o papel do dióxido de
carbono na oxidação do carbono. A natureza dos depósitos de coque foi predominantemente filamentos amorfos e carbono poliaromático sobre a superfície da ferrita de cobalto. O CO2 foi
adsorvido preferencialmente na superfície da ferrita de cobalto como bicarbonato de acordo com FTIR de CO2 adsorvido e TPD-CO2. A acidez de Lewis característica da ferrita de cobalto
não foi alterada com a presença de CO2 adsorvido na superfície de acordo com a FTIR da
piridina adsorvida.
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