SMAI和CI法制备的NiAg／SiO_2催化剂的结构与催化性质研究  

STRUCTURAL AND CATALYTIC CHARACTERIZATION OF NiAg/SiO 2 CATALYSTS PREPARED VIA SOLVATED METAL ATOM IMPREGNATION METHOD

作　　者：吴世华[1] 朱常英[1] 邓国才[1] 马洪涛[1] 

机构地区：[1]南开大学化学系

出　　处：《燃料化学学报》1996年第5期459-463,共5页Journal of Fuel Chemistry and Technology

摘　　要：应用溶剂化金属原子浸渍（ＳＭＡＩ）法和普通浸渍（ＣＩ）法制备了金属含量相同的ＳｉＯ２负载ＮｉＡｇ双金属催化剂。ＸＲＤ和磁测定结果表明ＳＭＡＩ催化剂中Ｎｉ和Ａｇ的粒度均小于金属含量相同的ＣＩ催化剂，ＳＭＡＩ催化剂中Ｎｉ和Ａｇ未形成合金，而ＣＩ催化剂中Ｎｉ和Ａｇ形成了合金。ＳＭＡＩ和ＣＩ催化剂都具有超顺磁性。研究了这些催化剂在甲苯加氢反应的催化性质，结果表明与组成相同的普通浸渍法催化剂相比，ＳＭＡＩ催化剂显示出较高的催化活性。The solvated metal atom impregnation (SMAI) and conventional impregnation (CI) methods were used to prepare different mole ratio NiAg biemetallic catalysts supported on SiO 2 The results of XRD and magnetic measurements showed that the Ni and Ag particle sizes of SMAI catalysts were smaller than those of CI catalysts with the same metal contents NiAg alloy was formed in CI catalysts but not formed in SMAI catalysts Both SMAI and CI catalysts had superparamagnetism The catalytic properties of these catalysts in toluene hydrogenation were studied The results showed that the SMAI catalysts exhibited much greater activities than the CI catalysts with the same composition This is because the SMAI catalysts possess higher dispersity and reduction degree (percentage of metal in zerovalent state)

关 键 词：金属催化剂 溶剂化 金属原子 浸渍 催化性 

分 类 号：TQ426.8[化学工程]