铜基氧化锆载体合成甲醇催化剂的结构表征

以ＸＲＤ，ＥＸＡＦＳ和ＥＳＲ等手段考察了ＣｕＯ／ＺｒＯ２催化剂及其还原态的结构，结果表明，在ＣｕＯ／ＺｒＯ２中铜以ＣｕＯ的形式存在，ＺｒＯ２载体对所负载的ＣｕＯ的结构有影响，ＣｕＯ的分散度与焙烧温度有关，在适当的温度下焙烧，负载于ＺｒＯ２上的ＣｕＯ可自发分散，在还原态试样中铜主要以有金属的形式存在，但是当试样中铜的含量小，铜的分散度高时有铜的氧化物存在，其Ｃｕ－Ｏ键距介于ＣｕＯ与ＣｕＯ２之间，Ｃｕ

CHARACTERIZATION OF Cu BASED ZrO 2 SUPPORTED CATALYSTS FOR METHANOL SYNTHESIS

The structure of CuO/ZrO 2 catalysts and their reduced states has been characterized by means of XRD, EXAFS and ESR. It is found that CuO is the only compound containing copper in CuO/ZrO 2 and the ZrO 2 support has influence on the structure of CuO. CuO in CuO/ZrO 2 can disperse spontaneously at a proper calcination temperature. In the reduced catalyst samples, only metal copper is detected when the weight percent of CuO in CuO/ZrO 2 exceeds 12%; when the CuO content is 3 5%, metal copper is predominant but not exclusive, copper oxide also exists, in which the bond distance of Cu-O is between that of pure CuO and pure Cu 2O. With the decrease of the content of CuO in CuO/ZrO 2, the dispersion of CuO (for the CuO/ZrO 2) and metal copper (for the reduced samples) on ZrO 2 increases and the productivity of methanol from CO/2H 2 on per gram copper also increases.