聚合物稳定的Au-Pd/TiO2-Al2O3催化剂的还原方法及其催化性能的研究

以PVP为稳定剂，乙醇和K1BH4为还原剂制备了Au-Pd／TiO2-Al2O3催化剂，考察了还原剂对Au-Pd负载型双金属催化剂加氢脱硫性能的影响，并运用XRD，TPD，TPR等技术对催化剂进行表征。结果表明，以乙醇还原的Au-Pd／TiO2-AlO3催化剂的加氢脱硫活性较好。乙醇还原的Au-Pd／TiO2．Al2O3催化剂中Au-Pd之间及活性组分与载体之间的相互作用较强，形成Au-Pd，合金的晶粒较小，活性组分的分散度和活性表面积较大，反应活化能较低，这些均有利于催化剂活性的提高。

Study on Methods of Reduction and Catalytic Performance of Polymer-Stabilized Au-Pd Catalysts

The PVP-stabilized Au-Pd/TiO_2-Al_2O_3 bimetallic catalyst was prepared by different reduced methods and its catalytic performance for thiophene hydrodesulfurization(HDS) reaction were studied.The prepared samples were characterized by XRD,TPD,TPR etc.It is found that there is synergistic effect between Au and Pd and Au_xPd_y alloy are formed.Au-Pd/TiO_2-Al_2O_3 catalysts which are reduced by CH_3CH_2OH and KBH_4 exhibit good catalytic activity and the one reduced by CH_3CH_2OH is higher.Compare with the Au-Pd/TiO_2Al_2O_3 catalyst reduced by KBH_4,the Au-Pd in the Au-Pd/TiO_2-Al_2O_3 catalyst reduced by CH_3CH_2OH has stronger interaction with support,larger active surface area and dispersion,smaller Au_xPd_y alloy grain and the apparent activation energy is lower,all these are advantageous to the catalyst active enhancement.