中文摘要：

在聚乙二醇（PEG）辅助下,用溶胶-凝胶法制备了一系列Cu-Zn-Al双功能催化剂,采用X射线粉末衍射、N2吸附、X射线光电子能谱、H2程序升温还原和NH3程序升温脱附等方法对催化剂进行了表征,并将催化剂用于浆态床合成气一步法制二甲醚反应中,考察了PEG用量对催化剂性能的影响.结果表明,PEG的添加可改善催化剂的织构性质和表面性质,进而提高催化剂活性.随着PEG用量增加,催化剂比表面积、孔体积和孔径逐渐增大,还原温度先降低后升高,活性组分分散度、表面Cu含量和表面强酸量先增加后减少.然而,PEG的添加仅能提高催化剂上制二甲醚反应的活性和选择性,对催化剂稳定性没有影响.

英文摘要：

A series of Cu-Zn-Al catalyst samples were prepared by sol-gel method with the assistance of polyethylene glycol（PEG） additive.The effect of PEG dosage on their physical and chemical properties was characterized by X-ray diffraction,N2 adsorption,X-ray photoelec-tron spectroscopy,H2 temperature-programmed reduction,and NH3 temperature-programmed desorption.The catalytic performance of the catalyst for direct dimethyl ether（DME） synthesis from syngas was evaluated in a slurry reactor.The results showed that PEG can improve the texture and surface physical and chemical properties of the catalyst and therefore enhance its catalytic activity.With the increase of PEG dosage,the specific surface area,pore volume,and pore diameter of the catalyst increased,whereas the reduction temperature decreased first and then increased,and the dispersion of active component,surface Cu content,and strong acid amount first increased and then decreased.However,adding PEG can only enhance catalytic activity and selectivity of the catalyst,but has no effect on the catalyst stability.