铜含量对Cu/CeO2水煤气变换催化剂性能的影响

采用共沉淀法制备了不同铜含量的Cu/CeO₂水煤气变换催化剂，考察了铜含量对催化活性的影响。结果表明，Cu/CeO₂催化剂呈现出良好的水煤气变换活性。铜含量对催化活性有显著影响，铜摩尔分数为50%时，催化剂的低温活性最高，在200 ℃时CO转化率达到66.1%。Cu/CeO₂与FBD型铁基高温变换催化剂相比，具有低温活性好、活性温区宽的特点。用XRD、N2吸附法、H₂-TPR和CO-TPD对催化剂进行了表征，结果表明,无定形CuO、纳米颗粒CuO等可能是催化反应的活性物种，晶粒CuO对催化活性影响不大。铜含量的催化剂在不同温度下呈现出不同的活性。

Influence of copper loadings on the performance of Cu/CeO2 catalysts for water-gas shift reaction

Cu/CeO₂catalysts for water-gas shift (WGS) reaction were prepared by co-precipitation,and the influence of copper loadings on the catalytic performance of catalysts was investigated. The results showed that Cu/CeO₂catalysts exhibited excellent WGS activity due to the combined effects of copper oxide and cerium dioxide, and copper loadings had remarkable influence on the catalytic activity. Optimum activity was obtained at copper loading (mass fraction) of 50% in Cu/CeO₂ catalyst,with CO conversion of 661% at 200 ℃.Compared with FBD iron-based HTS catalyst,Cu/CeO₂catalysts features higher activity at low-temperature andwider temperature range for maintaining its activity (200-500 ℃).XRD,N2 adsorption,H₂-TPR and CO-TPD results indicated that amorphous and nanocrystalline CuO were the active species for WGS reaction, while bulk CuO particles contributes little to the activity.Samples with different copper loadings at different temperature showed different overall activity.