聚合物固载Co-Pd催化剂的结构与活性

Structure and Activity of Polymer Immobilized Co-Pd Catalysts

采用溶剂化金属原子浸渍(SMAI)法制备了几种不同金属含量的Co-Pd催化剂,用X射线衍射、X射线光电子能谱和磁测定对催化剂进行表征,并与普通浸渍法(CI)制得的相同金属含量的催化剂进行比较.结果表明SMAI法制备的催化剂金属粒度小于CI法制备的催化剂,且前者零价金属含量高于后者.SMAI法制备的催化剂Co在表面上富集,而CI法制备的催化剂Co在表面和体相的金属含量基本相同.在二丙酮醇加氢及电催化反应中,SMAI法催化剂比相同组成的CI法催化剂具有更高的催化活性.

Solvated metal atom impregnation (SMAI) method was used to prepare polymer immobilized metal catalysts under mild conditions.Several SMAI Co Pd catalysts with different metal contents were prepared.These catalysts were studied by X ray diffraction (XRD),X ray photoelectron spectroscopy (XPS) and magnetic measurement.Compared with catalysts prepared by common impregnation (CI) method,the particle sizes of the metal in SMAI catalysts were much smaller.The contents of zero valent state metallic Co and Pd in SMAI catalysts were higher than those in CI catalysts.The Co atoms were enriched on the surface for SMAI catalysts,whereas the Co atom concentration on the surface was essentially the same as in the bulk for CI catalysts.The catalytic activity of SMAI catalysts was much greater than that of CI catalysts with the same composition in hydrogenation of diacetone alcohol and O2 reduction on fuel cell electrodes.