雾化高温分解法铜基甲醇合成催化剂的活性位  

ACTIVE SITES OF AHTD Cu-BASED CATALYSTS FOR METHANOL SYNTHESIS

作　　者：胡云行[1] 黄爱民[1] 蔡俊修[1] 万惠霖[1] 蔡启瑞[1] 

机构地区：[1]厦门大学化学系固体表面物理化学国家重点实验室,厦门361005

出　　处：《Chinese Journal of Catalysis》1993年第6期415-419,共5页催化学报（英文）

基　　金：国家自然科学基金

摘　　要：本文测定了雾化高温分解(AHTD)法制备的一系列Cu/ZnO催化剂的铜表面积,并将其与催化活性进行了关联。结果表明在含有CO_2的原料气中,催化剂活性位可能是由Cu^0组成。AHTD法Cu/ZnO催化剂的CO-TPD显示出两个明显的脱附峰,低温脱附的CO可能是吸附在Cu^+上的。Cu^+在无CO_2的原料气中起了催化作用。X射线诱导Auger谱测定结果表明,还原活化后和反应2小时后催化剂表面除大量的Cu^0外,还有少量的Cu+存在,在CO_2含量不大时(1～3％),Cu^+量与原料气的组成无关。Cu surface areas of AHTD (Aerosol High Temperature Decomposition) Cu/ZnO catalysts were measured. With CO/H2 (31/69) and CO2/ CO/H2(3/30/67) feed gases, it was found that the activities for the feed gas containing CO2 increased linearly with Cu surface area, indicating that the active sites for the feed gas containing CO2 consist of Cu0 There were two peaks in each of the CO-TPD curves of the Cu/ZnO catalysts, the low temperature CO-TPD peak was produced from CO adsorbed on Cu+. It was found that the activities for the feed gas containing no CO2 increased linearly with the amount of CO desorbed at low temperature, indicating that the active sites consist of Cu+. X-ray induced Auger spectra showed that there were small amount of Cu+ and larger amount of Cu on the surface of the reduced and the working AHTD Cu/ZnO catalysts. When feed gas contained small amount of CO2 (1-3%), the content of stable Cu+ was independent of the composition of feed gas.

关 键 词：铜 氧化锌 催化剂 甲醇 活性位 

分 类 号：O623.411[理学—有机化学]