摘要
利用金属蒸气法制备了不同组成的Nj-CujSiO_2双金属催化剂,XRD、TEM和磁性测定表明有Ni-Cu合金形成,合金颗粒的组成不均匀,而且有部分自由的Ni和Cu存在;Ni/Cu摩尔比为1:1催化剂的催化活性大于2:1和3:1的双金属催化剂以及Ni和Cu的单金属催化剂。
Ni-Cu/SiO2 catalysts with different compositions were prepared by metal vapor method. XRD, TEM and magnetic measurements showed that Ni-Cu alloy was formed, the composition of the alloy particles were nonuniform and some free Ni and Cu atoms also existed, the metallic particle size depended on the atomic ratios Ni/Cu. As the Cu content increased, the metallic particle size increased and varied between 30-100A. XPS observations revealed that Ni was in zero, +1, and +2 valence states. Cu mainly existed as metallic Cu and Partly as Cu2O. The results of XPS also show that the surface compositions of these catalysts were different from those of their bulk. In contrast with the surface enrichment in copper generally observed on Ni -Cu catalysts, the surfaces of these catalyst were enriched in nickel. The results of hydrogenation of furfural showed that the activity of bimetallic catalyst with Ni/Cu molar ratio 1 : 1 was greater than those with Ni/Cu 2 = 1 and 3=1, and those of Ni (or Cu) monometallic catalysts.
出处
《高等学校化学学报》
SCIE
EI
CAS
CSCD
北大核心
1991年第8期1099-1102,共4页
Chemical Journal of Chinese Universities
关键词
负载型
催化剂
SMAI
浸渍法
金属
Metal vapor synthesis, Ni-Cu bimetallic catalysts, Magnetic property, XPS (Y,X)
