Preparation of Cu/Zn catalyst from acetate in CO2 hydrogenation to methanol
Using acetate as the precursor,different proportions of Cu/Zn catalysts were prepared by hydrother-mal method,and the performance of CO2 hydrogenation to methanol was evaluated without H2 pretreatment.The effects of different Cu/Zn ratios on the crystalline phase structure,surface properties and valence state of the catalyst were investigated by XRD,TG-DSC,H2-TPR,CO2 temperature-programmed desorption and XPS,and its active sites were studied.The results show that the activity of the Cu/Zn catalyst prepared with acetate as the precursor is evaluated without pretreatment,and the H2 in the reaction gas(H2∶CO2=3∶1)will re-duce the Cu2+of the Cu/Zn catalyst to Cu0 to form a new Cu0-ZnO interface,which makes the Cu/Zn45 achieve a spatiotemporal yield of 7.97 mmol/(g·h)at 3 MPa and 240 ℃.
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