介孔Ce1-xZrxO2负载的Cu基催化剂在富氢条件下催化CO选择性氧化

采用多元醇为模板剂合成了介孔Ce1-xZrxO2(x=0.2,0.35,0.5)固溶体材料,并以其为载体负载CuO制备了Cu基催化剂.应用透射电子显微镜、X射线衍射、程序升温还原、程序升温脱附和N2吸附-脱附等技术对载体及催化剂进行了表征,并研究了Zr的取代比例x值对载体和Cu基催化剂性能的影响.结果表明,所有Ce1-xZrxO2样品均为介孔材料,其中Ce0.5-Zr0.5O2载体样品有较大的比表面积(181m2/g),CuO/Ce0.5Zr0.5O2催化剂样品在富氢条件下有较高的催化CO选择性氧化反应的活性和选择性.与其他催化剂样品相比,CuO/Ce0.5Zr0.5O2催化剂样品中形成的活性中心更多,分散性更好,对CO的吸附量更大,CO脱附温度更低,活性组分与载体的相互作用更强。

Catalytic Performance of Mesoporous Ce1-xZrxO2-Supported CuO-Based Catalyst for CO Selective Oxidation under H2-Rich Conditions

Mesoporous Ce1-xZrxO2(x=0.2,0.35,0.5) material samples were synthesized with polyol as a template,and Cu-based catalyst samples were prepared using Ce1-xZrxO2 as the support.The support and Cu-based catalyst samples were characterized by transmission electron microscopy,X-ray diffraction,temperature-programmed reduction,temperature-programmed desorption,and N2 physisorption techniques.The influence of x values on performance of the support and Cu-based catalyst for CO selective oxidation under H2-rich conditions was investigated.The results showed that all the Ce1-xZrxO2 samples were mesoporous materials,and the highest surface area(181 m2/g) was obtained when x=0.5.The CuO/Ce0.5Zr0.5O2 catalyst sample showed higher catalytic activity and selectivity under H2-rich conditions,and the CO conversion and selectivity were 100.0% and 96.2% at 383 K,respectively.Compared with the other catalyst samples,the CuO/Ce0.5Zr0.5O2 sample had the strongest interaction between the active component and the support,a large number and the highest dispersion of active sites,the most CO adsorption amount,and the lowest desorption temperature,being advantageous to enhance catalyst activity.