置换反应制备Pd-Fe双金属催化剂及其催化加氢性能

以Fe(CO)5为前体采用超声法合成纳米Fe胶体粒子，通过Fe胶体与PdCl2发生金属置换反应制备出活性炭负载Pd-Fe双金属催化剂。研究了表面活性剂聚乙烯吡咯烷酮对制备负载型催化剂的影响。采用XRD、H2程序升温还原（H2-TPR）、TEM、EDX等表征手段对催化剂进行表征，以苯乙炔加氢反应为探针反应考察了Fe含量对于催化剂催化性能的影响。结果表明加氢催化活性较差的金属组分Fe在合适的比例下可以促进Pd基催化剂的加氢催化活性和选择性，然而，过多的Fe也会降低其催化活性。

Preparation of Pd-Fe Catalysts via Galvanic Replacement Reaction and Their Catalytic Hydrogenation Performance

The bimetallic Pd-Fe catalysts supported on activated carbon were synthesized through the replacement reaction between PdCl2 and Fe colloid which was obtained from Fe(CO)5 by sonication. The influence of PVP on the preparation of the supported catalysts was investigated. A series of characterizations including XRD, H2-TPR, TEM and EDX were used to investigate the composition and structure of Pd-Fe catalysts. The liquid phase hydrogenation of phenylacetylene was used as a probe reaction to study the influence of Fe content on the catalytic properties of the bimetallic Pd-Fe catalysts. The results indicated that, Fe could improve the catalytic activity and selectivity for hydrogenation of the Pd-Fe bimetallic catalyst under the condition with appropriate proportion of Pd and Fe, while more Fe content would reduce its catalytic activity.