CuO-La_2O_3/ZrO_2催化剂催化乙醇水蒸气重整制氢

采用氨水沉淀法和浸渍法制备了复合氧化物催化剂CuO-La2O3/ZrO2(简称Cu-La/ZrO2催化剂),研究了Cu-La/ZrO2催化剂在乙醇水蒸气重整制氢反应中的催化性能。用N2吸附-脱附、透射电子显微镜、X射线衍射、X射线光电子能谱对试样进行了表征。Cu-La/ZrO2催化剂为单斜晶相结构的纳米晶粒,Cu物种高度分散在ZrO2载体表面,Cu-La/ZrO2催化剂经还原后,Cu物种主要以Cu2O形式存在,反应后Cu物种主要以单质形式存在。Cu-La/ZrO2催化剂对乙醇水蒸气重整反应有较高的活性和选择性。在乙醇与水的摩尔比1∶6.33、乙醇水溶液进料量0.1mL/min、Cu-La/ZrO2催化剂用量500mg的条件下,反应温度723K时乙醇转化率为78%～88%,气相产物中H2的摩尔分数约为75%,CO摩尔分数小于1%,CH4摩尔分数约为1%;反应温度773K时,乙醇转化率可达98%。

Hydrogen Production by Steam Reforming of Ethanol over CuO-La2O3/ZrO2 Catalyst

CuO-La2O3/ZrO2 catalyst was prepared by precipitation and impregnation,and characterized by means of XRD,TEM,N2 adsorption-desorption and XPS.The prepared catalyst is of nano-size crystals in monoclinic crystalline form.The copper species are highly dispersed on surface of ZrO2 support,and are mainly in form of Cu2O on catalyst surface after reduction by hydrogen.After steam reforming of ethanol,the copper species mainly turn to metallic Cu.The catalysts show relatively high activity and hydrogen selectivity in the reaction.Under conditions of mole ratio of ethanol to water 1 ∶6.33,CuO-La2O3 /ZrO2 catalyst 500 mg,flow rate of ethanol aqueous solution 0.1 mL/min and reaction temperature 723 K,ethanol conversion is 78%-88%.The mole fractions of main gaseous products are hydrogen 75%,CO less than 1% and CH4 1%.Ethanol conversion can reach 98% at reaction temperature 773 K.