La_2O_3对Cu/ZnO催化剂性质和CO_2加氢反应性能的影响

EFFECT OF LA_2O_3 ON THE CATALYTIC PERFORMANCE AND PROPERTIES OF CU/ZNO CATALYST FOR HYDROGENATION OF CO_2

运用活性评价、XRD、TPR、CO2 -TPD、CO -TPD等手段 ,探讨了La2 O3对Cu/ZnO催化剂性质和CO2 加氢反应性能的影响。试验结果表明 :催化剂经La2 O3改性后 ,CuO晶粒明显变细 ;CuO -ZnO催化剂还原难度略有增加 ;有利于CO歧化反应进行 ,使催化剂上积炭量增加 ;CO2 加氢生成甲醇的活性增加。

The effect of La 2O 3 on catalytic activity and reaction performance of Cu/ZnO catalyst for CO 2 hydrogenation has been studied by activity measurement,XRD,TPR,CO 2-TPD and CO-TPD.The experimental results show that La 2O 3 added to Cu/ZnO catalyst increases the reduction difficulty of CuO/ZnO catalyst,promotes CO disproportionation reaction and increases the carbon deposit on Cu/ZnO catalyst,decreases the CuO crystallite size,and enhances the methanol yield.