CuO－ZnO基CO_2／H_2合成甲醇催化剂的反应活性中心

THE ACTIVE CENTER OF CuO-ZnO BASED CATALYSTS FOR METHANOL SYNTHESIS FROM COZ AND H_2

应用ＸＰＳ，ＸＡＥＳ和紫外漫反射光谱法研究了ＣｕＯ－ＺｎＯ／氧化物上ＣＯ２／Ｈ２合成甲醇的反应活性中心．ＣｕＯ－ＺｎＯ／氧化物催化剂上的反应活性中心是存在于ＣｕＯ－ＺｎＯ固溶体中的Ｃｕ－Ｚｎ－Ｏ（＂□＂为氧空位），活性中心的Ｃｕ价态为Ｃｕ－和Ｃｕ０．反应活性中心在ＣｕＯＺｎＯ－ＺｒＯ２催化剂上比在其它ＣｕＯ－ＺｎＯ／氧化物催化剂如ＣｕＯ－ＺｎＯ，ＣｕＯ－ＺｎＯ－ＭｇＯ，ＣｕＯＺｎＯ－Ａｌ２Ｏ３和ＣｕＯ－ＺｎＯ－ｒ２Ｏ３上更加稳定．

he nature of active centers of Cuo-Zno catalysts combined with other metal oxides for methanol synthesis from CO2 and H2 has been studied by XPS and XAES.The active center of CuO-Zno based catalysts was suggested to be Cu-D-Zn-O('□'oxygen vacancy)existing in CuO-ZnO solid solution in which the states of Cu are the mixture of Cu+ and Cu0. The active center is more stable in CuO-ZnO-ZrO, than that in the other Cuo-ZnO based catalysts, such as CuO-ZnO, CuOZnO-agO, CuO-ZnO--Al2O3,Cuo-ZnO-Cr2O3.