低温液相合成甲醇铜基催化剂的表征

采用X－射线衍射（XRD）和X－光电子能谱／Auger电子能谱（XPS／AES）方法，表征了部分催化剂的体相和表面物理化学性质。结果表明，具有较高催化活性的催化剂（CuCl或铜铬氧化物催化剂）均具有较多＋1价的铜；而催化剂中含有的Cu^2 ，将影响其催化活性；经过氢气高压还原处理或者使用后的催化剂中金属铜的含量明显增多，同时活性也大为降低，所有铜铬氧化物中的铬均为＋3价。

Characterization of Copper-based Catalysts for the Synthesis of Methanol

The structure and the properities of copper\|based catalysts have been investigated by means of X\|ray diffraction (XRD), X\|ray photoelectron and X\|ray induced Auger electron spectra (XPS/AES) characterization. The results show that there is a strong correlation between the catalytic activity and the surface concentration of monovalent Cu species. The existence of Cu 2+ species in un\|treated CuCl and of metal copper in hygrogen\|reduced catalyst and used catalysts should influence catalyst activity. The characterization results demonstrated that copper with plus one valence is the active species in the concurrent methanol synthesis. The valence state of chromium is plus three in all Cu\|Cr\|O catalysts because of the reduction in the course of the decomposition of homogeneous complexes.