用XPS研究不同方法制备的CuZnAl一步法二甲醚合成催化剂  

XPS Study on CuZnAl Catalysts Prepared by Different Methods for Direct Synthesis of Dimethyl Ether

作　　者：李志红[1] 黄伟[1] 左志军[1] 宋雅君[1] 谢克昌[1] 

机构地区：[1]太原理工大学煤科学与技术教育部和山西省重点实验室,山西太原030024

出　　处：《催化学报》2009年第2期171-177,共7页

基　　金：国家自然科学基金(20471040);国家重点基础研究发展计划(973计划;2005CB221204);长江学者和创新团队发展计划(IRT0517)

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Cu2+,还原后以Cu+和Cu0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Cu0.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.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.

关 键 词：X射线光电子能谱 机械混合法 溶胶-凝胶法 完全液相法 铜 锌 铝 复合氧化物 二甲醚 

分 类 号：TQ223.24[化学工程—有机化工]