Ni／Al2O3催化剂催化乙醇水蒸气重整制氢的研究

为提高用于燃料电池的乙醇水蒸气重整制氢反应催化剂的活性，采用壳聚糖扩孔以Al2O3为载体，Ni为活性中心的催化剂。利用X射线衍射（XRD）、BET比表面测试手段对催化剂的结构进行了表征。考察了反应温度、水醇物质的量的比、液体进料空速等对反应的影响。结果表明，经600℃焙烧2h的催化剂，在水醇物质的量的比为3：1，液体进料空速（WHSV）为4．8h^-1，反应温度500℃时，产气量接近40mL／min，H2选择性达到68％。乙醇水蒸气重整制氢Ni／Al2O3催化剂的最佳反应温度为500～550℃，水醇物质的量的比一般控制在3：1～5：1范围内较好。

Hydrogen Production by Steam Reforming of Ethanol Over Ni/Al2O3 Catalyst

A new and simple method to prepare Al2O3 and Ni/Al2O3 spherical catalysts for hydrogen production by steam reforming of ethanol is proposed. The present method was developed by using a biopolymer （chitosan） and A1 solution. The catalysts were characterized by X-ray Diffraction（XRD）, N2 adsorptionmethods（BET）. The influence of reaction conditions which include dif- ferent reaction temperature, different molar ratio of H2O to CH3 CH2 OH and weight hourly space velocity（WHSV） were investigated. The study shows that catalyst which bake at 600 ℃ for 2h, results in the gas production of 40 mL/min, the H2 selectivity of 68%. Under the reactiontem perature range from 500 ℃ to 550℃, Ni/Al2O3 shows best performance for the hydrogen production by steam reforming of ethanol. The suitable molar ratio of H2O to CH3CH2OH ranges from 3 to 5.