纳米CoFe_2O_4催化剂催化转化乙醇制氢  

Hydrogen Production from Ethanol over CoFe_2O_4 Nanocatalyst

作　　者：王卫平[1] 吕功煊[2] 

机构地区：[1]石油化工科学研究院,北京100083 [2]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,甘肃兰州730000

出　　处：《分子催化》2009年第6期545-550,共6页Journal of Molecular Catalysis(China)

基　　金：国家重点基础研究发展规划项目(G20000264);科技部973;863项目(2007CB613305;2009CB220003;2009AA05Z117);中国科学院太阳能行动计划(KGCX2-YW-390-1 and KGCX2-YW-390-3)资助.

摘　　要：采用溶胶-凝胶法制备了纳米CoFe2O4催化剂并用于乙醇裂解和部分氧化制氢反应.CoFe2O4催化剂对乙醇催化裂解反应表现出较低的催化活性,其主要原因可能是催化剂表面积碳以及催化剂粒径的长大.而纳米CoFe2O4催化剂对乙醇部分氧化制氢反应具有良好的催化性能.TPR和XRD结果表明尖晶石结构的CoFe2O4相在乙醇部分氧化反应过程中发生了结构变化,部分生成了CoFe合金相.另外,催化剂的粒径没有明显增大.推测纳米CoFe2O4催化剂具有良好催化性能是尖晶石结构的CoFe2O4和合金相的协同作用所致.Partial oxidation and decomposition of ethanol to hydrogen over CoFe2O4 nanocatalyst prepared by sol-gel method was reported in this paper. The low activity via decomposition of ethanol over CoFe2O4 nanocatalyst can be attributed to the deposition of carbon and growth of particle size. The effects of reaction temperature and the molar ratio of O2 and ethanol on the performance of the CoFe2O4 nanocatalyst via the partial oxidation of ethanol were investigated. It was found that CoFe2O4 nanocatalyst showed high activities for the partial oxidation of ethanol to hydrogen. The ethanol conversion and hydrogen to selectivity increase with the increase of reaction temperature. At O2/ethanol = 1.5, hydrogen to selectivity achieves the maximum. Combined with the results of TPR and XRD, it is speculated that a part of CoFe2O4phase were reduced to from CoFe alloy, the synergic reaction of CoF2O4 and CoFe alloy plays an important role in reaction processes.

关 键 词：纳米CoFe2O4催化剂 溶胶-凝胶法 乙醇 部分氧化 裂解 制氢 

分 类 号：O643.32[理学—物理化学]