摘要
分别采用均匀沉淀法、沉淀法和浸渍法制备了Ni/Al_2O_3催化剂,在常压固定床反应器中评价了Ni/Al_2O_3催化剂在乙醇水蒸气重整制氢反应中的性能;采用X射线衍射和低温N_2物理吸附法对Al_2O_3载体和Ni/Al_2O_3催化剂进行了表征;考察了载体焙烧温度及时间、催化剂制备方法、Ni负载量和催化剂还原时间等制备条件对Ni/Al_2O_3催化剂性能的影响。实验结果表明,以600℃下焙烧2 h的Al_2O_3为载体、采用浸渍法负载质量分数10.0%的Ni、在500℃焙烧1 h且在650℃下还原1 h的Ni/Al_2O_3催化剂的活性和选择性最好。在500℃、重时空速9 6 h^(-1)、水与乙醇的摩尔比为3:1的反应条件下,乙醇转化率达100%,产气速率为83.0 mL/min,H_2选择性为63.6%。
Ni/Al2O3 catalysts were prepared separately by homogeneous precipitation, precipitation and impregnation. Hydrogen production from steam reforming of ethanol over Ni/Al2O3 catalyst was studied in a fixed-bed reactor. The structures and surface characteristics of Al2O3 support and Ni/Al2O3 catalyst were determined by means of XRD and N2 physical-adsorption. Influences of calcination temperature and time of support, Ni loading, preparation method and reduction conditions of Ni/Al2O3 on catalyst activity were investigated. The preferable preparation conditions were as follows：Al2O3 support was calcined at 600 ℃ for 2 h, Ni/Al2O3 catalyst with Ni loading of 10.0% （ mass fraction, based on Al2O3 support） was prepared by impregnation and calcination at 500 ℃ for 1 h, and then reduced by H2 at 650 ℃ for 1 h. Under the conditions： reaction temperature 500 ℃, mole ratio of water to ethanol 3 ： 1 and WHSV 9.6 h^-1, selectivity to H2 was 63.6%, output of gas was 83.0 mL/min and ethanol conversed completely.
出处
《石油化工》
CAS
CSCD
北大核心
2009年第11期1164-1168,共5页
Petrochemical Technology
基金
北京市委组织部资助项目(20081 D0500500142)
北京石油化工学院青年科研基金联合资助项目(N08-01)
关键词
镍催化剂
氧化铝载体
乙醇
水蒸气重整
制氢
nickel catalyst
alumina support
ethanol
steam reforming
hydrogen production
