Effect of preparation method on performance of Cu-Fe/SiO2 catalysts for higher alcohols synthesis from syngas

摘要

Five Cu-Fe/SiO2 catalysts were prepared by deposition-precipitation, solid state impregnation, solid-state chemical reaction, citric acid combustion, and ultrasound-assisted wet impregnation, and their physicochemical and catalytic properties for higher alcohols synthesis were investigated. The results showed that the Cu-Fe/SiO2 catalyst prepared by ultrasound-assisted impregnation had a higher dispersion and reducibility of active metal oxides, and the largest S-Cu, which increased the amount of adsorbed CO and the ability for CO dissociation. As a result, the CO conversion and space time yield of total alcohols of the catalyst reached 14.04% and 104.3 g kg(-1) h(-1), respectively, which were better than the other catalysts.