关键词: liquid-phase preparation technology , slurry reactor , dimethyl ether , syngas , heat treatment atmosphere , liquid-phase preparation technology, slurry reactor, dimethyl ether, syngas, heat treatment atmosphere

Abstract: CuZnAl slurry catalysts were prepared by a complete liquid-phase method. The structure properties of the catalysts were characterized by XRD, XPS, N2-physisorpiton, and the influence of heat treatment atmospheres on the performance for the single-step synthesis of DME from syngas was investigated. The results indicated that the heat treatment atmosphere showed obvious influence on the Cu species and the ratio of Cu0/Cu+ on the catalyst. Moreover, it was concluded that final Cu/Zn ratio on catalyst surface mainly depended on its composition and reaction environment and had less relation to heat treatment atmosphere. But air as heat treatment atmosphere affected the final crystallographic structure of the catalyst. The activity evaluation results indicated that the catalysts prepared by the complete liquid-phase technology can suppress the sintering of the active sites at higher temperature. All the catalysts were so active for methanol dehydration and the heat treatment atmosphere mainly affected the capability of methanol synthesis. The catalysts performed best when used N2 as the heat treatment atmosphere.