金属蒸气法制备聚合物固载双金属催化剂———Pd-Cu催化剂的价态,分散度与活性

PREPARATION OF POLYMER IMMOBILIZED BIMETALLIC CATALYSTS BY METAL VAPOR METHOD ——VALENT STATES,DISPERSIONS AND ACTIVITIES OF Pd Cu CATALYSTS

利用金属蒸气法制备了三种不同金属重量比的树脂固载及活性炭负载ＰｄＣｕ双金属催化剂．透射电镜（ＴＥＭ）和Ｘ射线衍射（ＸＲＤ）测定结果表明催化剂中ＰｄＣｕ已形成合金．合金粒度极小，平均直径小于５ｎｍ．树脂固载催化剂金属粒度远小于活性炭负载催化剂的金属粒度．Ｘ射线光电子能谱（ＸＰＳ）结果表明Ｐｄ和Ｃｕ均以零价态存在．在４甲基３戊烯２酮加氢反应中。

The metal vapor method was used to prepare resin immobilized and active carbon supported Pd Cu bimetallic catalysts with three different Pd/Cu weight ratios.The transmission electron micrograph(TEM) and X ray diffraction(XRD) measurements showed that Pd Cu alloy was formed and the particle sizes of the alloy were very small,with average diameters<5 0nm.The metal particle sizes of resin immobilized catalysts were much smaller than that of active carbon supported catalysts.X ray photoelectron spectroscopy indicated that both Pd and Cu were in zero valent state.The catalytic activities and selectivities of resin immobilized Pd Cu catalysts in hydrogenation of 4 methyl 3 penten 2 one were much greater than that of the active carbon supported Pd Cu catalysts.