Abstract
A series of Cu/Zn/Al/Si slurry catalysts were prepared using acidic and alkaline silica sols by the complete liquid-phase technology. The samples were characterized with XRD, H2-TPR, FT-IR, BET, NH3-TPD, XPS and TEM techniques. Addition of acidic silica sol to the catalyst gave the highest CO conversion and dimethyl ether (DME) selectivity, being 65.38% and 76.26% respectively. The acidic silica sol weakens the interaction between Cu and other components, resulting in a rapid reduction of Cu species and exposure of more active lattice planes of Cu0. In addition, the acidic/alkaline properties of silica sol also influence the number and the strength of acid sites in the sample. It was found that both the strong and the weak acid sites decreased in the strength. The acidic silica sol significantly increased the weak acid sites, mesopores and specific surface area, consequently promoting the methanol dehydration and increasing the DME selectivity.
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