负载型Pd-Pt双金属催化剂中活性组分非均匀型分布研究Ⅱ：活性组分非均匀分布对双金属催化剂反应性能的影响  

Study on Non-uniformity Distribution of Active Component in Supported Pd-Pt Double Metal Catalysts Ⅱ:Effect of Non-uniformity Distribution on Reaction Performance of Double Metal Catalysts

作　　者：南军[1] 隋芝宇[1] 石芳[1] 于海斌[1] 刘晨光[2] 

机构地区：[1]中国海洋石油总公司中化建天津化工研究设计院 [2]中国石油大学CNPC催化重点实验室

出　　处：《石油与天然气化工》2008年第5期365-369,共5页Chemical engineering of oil & gas

摘　　要：采用饱和浸渍法制备负载于氧化铝载体上活性组分呈非均匀分布的Pd-Pt双金属催化剂,并在脉冲微反上进行了烯烃和芳烃的加氢反应性能考察。结果表明,活性金属在载体中呈现出非均匀分布结构带来催化剂加氢性能上有明显的不同,尤其是对于芳烃的加氢饱和能力。双金属催化剂的加氢性能好于单金属制备得到的催化剂,其中金属Pd催化剂对烯烃的加氢转化能力要优于单金属Pt催化剂;芳烃加氢相对烯烃加氢要难得多,分布在壳层的Pd能很好地发挥烯烃加氢性能,内部的Pt亦能很好地保持芳烃加氢转化能力。此外试验结果还表明,C=C双键加氢和苯环加氢可能发生在相同的活性中心上,二者间存在竞争吸附。Pd-Pt double metal catalysts supported on alumina were prepared by the impregnation method,and the activities of catalysts were evaluated on hydrogenation reactions of olefin and aromatics by pulse micro-reactor.Pd-Pt double metal had the no-uniformity distribution on alumina,and the structure of catalysts effected on the hydrogenation performance of catalysts,especially on the hydrogenation of aromatic.The hydrogenation performance of double metal catalysts was better than single metal catalysts and the activities of hydrogenation conversion to olefin of that of Pd catalysts was better than Pt catalysts.The reaction of aromatics hydrogenation was difficult than olefin hydrogenation.When Pd metal located the egg-shell of support,the active component expressed better olefin hydrogenation and when Pt metal exist at inner of support,the active component exhibited better aromatics hydrogenation.Moreover,the results showed that hydrogenation of C=C double bond and hydrogenation of benzene ring occurred on the same active site of double metal catalyst,and the competitive adsorption existed between two reactions.

关 键 词：贵金属催化剂 非均匀分布 烯烃加氢 芳烃加氢 苯乙烯 

分 类 号：O643.36[理学—物理化学] U416.217[理学—化学]