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采用沉积沉淀法制备了Au-Pd双金属催化剂,研究了ZnO对Au-Pd/CeO2催化剂甲醇部分氧化性能的影响,并运用N2吸附、XRD、UV-Vis、TPR、H2-TPD和CO-IR等手段对催化剂进行了表征.结果表明,ZnO的引入减少了Pd活性中心,降低了催化剂的活性,但提高了催化剂H2选择性和降低了CO选择性.Au-Pd/ZnO-CeO2催化剂的TPR表明,在约200℃时开始有部分ZnO被还原,CO-IR显示CO吸收峰移向低频,这些结果表明Au-Pd/ZnO-CeO2催化剂中Pd和Zn之间发生了相互作用.Pd和Zn之间相互作用抑制了Pd的甲醇分解活性,有利于H2和CO2的生成,使Au-Pd/ZnO-CeO2催化剂表现出较高的H2选择性和较低的CO选择性.
Au-Pd bimetallic catalysts were prepared by deposition precipitation method. The effects of ZnO on the partial oxidation of methanol over Au-Pd / CeO2 catalysts were investigated. The effects of N2 adsorption, XRD, UV-Vis, TPR, H2-TPD and CO- Etc. The results show that the introduction of ZnO reduces the activity center of Pd and reduces the activity of the catalyst but increases the selectivity of the catalyst and reduces the selectivity of CO.The TPR of Au-Pd / ZnO-CeO2 catalyst It is shown that some ZnO is reduced at about 200 ℃ and CO-IR shows that the absorption peak of CO shifts to low frequency.These results indicate that there is an interaction between Pd and Zn in Au-Pd / ZnO-CeO2catalyst.Pd and Zn The interaction between Pd and Pd inhibited the methanolysis activity of Pd, which was in favor of the formation of H2 and CO2, which made the Au-Pd / ZnO-CeO2 catalyst exhibit higher H2 selectivity and lower CO selectivity.