Cu/Zn、Cu/Zn/Ni催化剂甲醇部分氧化制氢  

Partial Oxidation of Methanol to Hydrogen over Cu/Zn and Cu/Zn/Ni Catalysts

作　　者：席靖宇[1] 吕功煊[1] 王志飞[1] 

机构地区：[1]中国科学院兰州化学物理研究所羰基合成与选择氧化国家重点实验室,兰州730000

出　　处：《物理化学学报》2001年第7期655-658,共4页Acta Physico-Chimica Sinica

基　　金：国家重点基础研究发展规划资助项目(G20000264)

摘　　要：研究了甲醇在Cu/Zn及Cu/Zn/Ni催化剂上部分氧化热耦合裂解制氢的反应，系统地考察了不同O_2/CH_3OH比及反应温度下催化剂性能.当O_2/CH_3OH=0.2时，催化剂的性能最佳.在同样条件下，Cu/Zn催化剂对CO的选择性较Cu/Zn/Ni催化剂低，更具优势. Cu/Zn催化剂用于甲醇部分氧化反应时，甲醇转化率在150 h寿命实验中基本保持在90％左右. XRD谱图表明Cu/Zn合金的生成是导致Cu/Zn系催化剂在甲醇裂解反应中快速失活的主要原因，而在部分氧化反应中，O_2的存在可抑制Cu/Zn合金的生成，使Cu/Zn催化剂表现出高度的稳定性.Catalytic generation of hydrogen by the coupling of decomposition and partial oxidation of methanol over Cu/Zn and Cu/Zn/Ni catalysts have been studied. These Cu-Zn based catalysts show high activity and stability for the partial oxidation of methanol. The catalytic activity and selectivity are affected by the ratio Of O-2/ CH3OH. The optimum reaction conditions for Cu-Zn catalyst are O-2/CH3OH = 0.2, T = 523 K. The formation of CuZn alloy was observed in the deactivated Cu/Zn catalysts after methanol decomposition at 523 K for 20 h. On the contrary, no CuZn alloy was found in the used Cu/Zn catalyst after partial oxidation of methanol for 150 h at 523 K. The presented results seem to indicate that the formation of CuZn alloy is one of the main reasons for the deactivation of Cu-Zn based catalysts in methanol decomposition.

关 键 词：甲醇 氢气 铜锌合金催化剂 部分氧化 铜锌镍 合金催化剂 制备 热耦合裂解 

分 类 号：O643.3[理学—物理化学]