Ni，Cu间的相互作用及其对CO加氢反应性能的影响

本文采用ＸＲＤ，ＴＰＲ，ＴＰＤ－ＭＳ，ＴＰＳＲ－ＭＳ和ＩＲ技术，研究了负载于ＳｉＯ＿２担体上的Ｎｉ，Ｃｕ间的相互作用以及所引起的ＣＯ加氢反应性能的变化。实验结果表明，双金属Ｎｉ和Ｃｕ之间可以很好地形成合金，Ｃｕ的４ｓ电子迁入Ｎｉ的３ｄ轨道的电子效应，使双金属催化剂对Ｈ＿２和ＣＯ的吸附能力有别于单金属Ｎｉ，Ｃｕ催化剂；ＣＯ加氢在Ｎｉ中心上按“表面碳”机理生成烃类，在Ｃｕ中心上通过ＨＣＯ＿（ａ）活性中间物生成醇类，Ｎｉ和Ｃｕ的合金化则有利于Ｃ＿２以上的物质生成。

Effects of Interaction between Nickel and Copper on CO Hydrogenation

The catalysts of Ni,Cu and Ni-Cu supported on SiO_2 were prepared by the impregnation method. Interaction between Ni and Cu and their catalytic be-haviors for CO hydrogenation have been studied by the XRD, TPR, TPD-MS,TPSR-MS and IR,The experimental results showed that:A homogeneous alloy of Ni-Cu is formed and the adsorption properties are affected by interaction between Ni and Cu. There are difference between bimetallic catalyst and single metallic catalyst on the catalytic behaviors of CO hydrogenation. CO hydrogenation to methane on the Ni sites is via a surface carbon mechanism and to alcohols on the Cu sites is via the intermediate HCO_(a).The selectivity of C_2 hydrocarbons on Ni-Cu alloy is better than that on other catalysts.