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中文摘要：
采用X射线光电子能谱对不同方法制备的CuZnAl二甲醚合成催化剂进行了比较研究．结果表明，传统方法制备的催化剂表面存在Cu^2＋，还原后以Cu^＋和Cu^0共同构成催化反应的活性中心，而完全液相法制备的浆状催化剂表面Cu物种以Cu^＋形式存在，还原后其表面活性中心主要是Cu^0．在液相还原过程中，完全液相法制备的催化剂表面Cu和Zn组分的分散性同时得到改善，使其在浆态床中的稳定性优于传统方法制备的催化剂．
英文摘要：
The chemical states of Cu and Zn in CuZnA1 catalysts for direct synthesis of dimethyl ether from syngas in a slurry reactor were investigated by X-ray photoelectron spectroscopy, and the catalysts were prepared by traditional methods and complete liquid- phase technology. It was found that the Cu species was present as Cu^2＋ in the catalysts prepared by traditional methods, while the Cu species was present as Cu^＋ in the catalysts prepared by complete liquid-phase technology. In the reduction process, Cu^2＋ was reduced to Cu^＋ and Cu^0 for the former, and both Cu^＋ and Cu^0 were considered as the active center of catalytic reaction. Cu^＋ was reduced to Cu^0 for the later. The reduction in liquid phase could improve the dispersion of Cu and Zn species and increase their contents on the surface of catalysts prepared by complete liquid-phase technology, thereby they had a much higher stability in a slurry-bed reactor.
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