Dy和Y掺杂改性对CuO/CeZrO_2催化剂在富氢气氛中CO优先氧化催化性能的影响

采用水热-浸渍法制备了系列Dy和Y掺杂改性的CuO/CeZrO_2催化剂,使用X射线粉末衍射(XRD)、N_2吸附脱附和程序升温还原(H_2-TPR)等手段对催化剂进行了表征,研究了Dy和Y掺杂改性对CuO/CeZrO_2在富氢气氛中CO优先氧化催化性能的影响。结果表明,所制备的CuO-CeZrO_2催化剂均为萤石结构;添加适当比例的Dy_2O_3和Y_2O_3能增强活性组分与载体间的相互作用,有利于CuO活性组分的分散和低温还原能力的提高,从而改善了CuO/CeZrO_2用于CO优先氧化的催化活性。同时,掺杂Dy和Y能够提高CuO/CeZrO_2催化剂的抗CO_2抑制作用的能力,改善其催化稳定性。

Effect of Dy and Y doping on the catalytic performance of CuO/CeZrO2 for the preferential oxidation of CO in H2-rich stream

CuO/CeZrO₂ catalysts doped with different amounts of Dy₂O₃ and Y₂O₃ were prepared by the hydrothermal-impregnation method and characterized by XRD, H₂-TPR and nitrogen sorption; the effect of Dy and Y doping on the catalytic performance of CuO/CeZrO₂ for the preferential oxidation of CO in H₂-rich stream was investigated. The results indicate that all the CuO/CeZrO₂ catalysts have a fluorite structure; doping with appropriate amounts of Dy₂O₃ and Y₂O₃ can improve the interaction between the active component and support, the dispersion of CuO and its reducibility at low temperature, which is effective to enhance the activity of Dy and Y doped CuO/CeZrO₂ catalysts in the preferential oxidation of CO. Moreover, the doping with Dy₂O₃ and Y₂O₃ can also reduce the inhibition effect of CO₂ on CuO/CeZrO₂ in CO oxidation and then improve its catalytic stability.