还原剂对Au-Pd/CeO2催化剂甲醇部分氧化性能的影响

摘要: 以PVP为保护剂,乙醇(ER)、乙二醇(GR)和水合肼(HR)为还原剂制备了一系列Au-Pd/CeO2催化剂，考察了还原剂对甲醇部分氧化性能的影响，并运用XRD、TPD和TPR等手段对催化剂进行了表征。结果表明，Au-Pd/CeO2(ER)催化剂具有较大的比表面积，形成的AuxPdy量较多、粒径较小、分散度较高、活性组分与载体的相互作用较强，同时对甲醇的吸附量较大和吸附温度较低。因此，该催化剂具有较高的催化活性和氢气选择性以及较低的CO质量分数。

Abstract: The PVPstabilized AuPd/CeO2 bimetallic catalysts were prepared by CH3CH2OH(ER), CH2OHCH2OH(GR) and N2H4·H2O(HR) reductants and their catalytic performance for partial oxidation of methanol was studied. XRD, TPR, TPD were used to characterize the catalysts. Comparing the Au-Pd/CeO2(GR) and Au-Pd/CeO2(HR) catalysts, AuPd/CeO2(ER) catalyst showed higher methanol conversion, hydrogen selectivity and lower content of CO for partial oxidation of methanol reaction (POM). Au-Pd/CeO2(ER) catalyst had larger BET surface area, dispersion and CH3OH adsorption amount, stronger metalsupport interaction , more AuxPdy alloy and smaller particles, which were all advantageous to the catalytic activity for the titled reaction.