Síntese, caracterização e aplicação de catalisadores à base de Cu, Ce e Zr na reação RWGS
Palavras-chave:
RWGS, cobre, cério, zirconiaResumo
As drásticas mudanças climáticas causadas pelo agravamento do efeito estufa vêm se intensificando ao longo das últimas décadas. Uma rota viável para reduzir essa problemática é a conversão catalítica do CO2 oriundo de fontes fixas transformando-o em produtos de valor para a indústria química. Neste trabalho, estudou-se a conversão de CO2 em CO por meio da reação de deslocamento gás-água reversa (RWGS), visando o desenvolvimento de catalisadores mais ativos e seletivos. Foram sintetizados catalisadores à base de cobre, cério e zircônio, pelo método da coprecipitação, com teores variados de Cu, representados como %CuCeZr (% = 30, 50, 70% de CuO), fixando em 50% a proporção entre os óxidos de Ce/Zr. Também foi preparado um catalisador 30CuZr (30% CuO, 70% ZrO2) para fins de comparação. Para caracterizá-los, utilizaram-se as técnicas DRX, ICP-OES, área BET, TPR-H2, TPD-CO2 e para avaliação na RWGS realizaram-se testes catalíticos com pré-tratamento redutor em reator de leito fixo. Os resultados indicaram que o 30CuCeZr apresentou o melhor desempenho, associado ao maior teor de Ce presente gerando uma maior quantidade de vacâncias de oxigênio, favorecendo assim a reatividade do sistema.
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