Co/La_2O_3催化乙醇水蒸汽重整制氢反应的研究

Study of producing hydrogen from steam reforming of ethanol over Co/La_2O_3 catalysts

采用浸渍、热分解、氢还原等步骤制备了一系列Co/La2O3催化剂,并将其应用于乙醇水蒸汽重整制氢反应。采用固定床反应考察了温度和水醇比对催化剂性能的影响。用N2吸附、XRD、TPR等手段对催化剂进行了表征。结果表明:5%Co/La2O3催化剂对乙醇水蒸汽重整制氢反应表现出最高的活性。在500℃、水醇比为3∶1时,乙醇的转化率达可到64.8%,H2的产率和选择性分别为1.0 mol/mol和86.1%。另外,在反应温度低于450℃时,H2的选择性可达90%以上。

Hydrogen production from steam reforming of ethanol over Co/La2O3 catalyst was studied by fixed - bed reactor. Several Co/La2O3 catalysts with different Co loadings were prepared by impregnation, thermal decomposition and hydrogen reduction. Structure and surface property of the catalyst were characterized by N2 adsorption,XRD,TPR methods. Results showed that 5.0% Co/La2O3 catalyst exhibited highest activity for steam reforming of ethanol,which 64.8% of ethanol conversion, 1.0 mol/mol of hydrogen yield and 86, 1% of hydrogen selectivity can be obtained at 500℃ and 3：1 of H2O/EtOH ratio.