论文部分内容阅读
采用简单的水热/溶剂热法,经后续在氮气气氛中的热处理合成了三维花型Co-Ni/C双金属催化剂,它由交织炭片构成,金属纳米颗粒高度分散其中.随着Co/Ni摩尔比的增加,金属颗粒的粒径逐渐从26nm减至4nm左右.将该催化剂用于邻氯硝基苯选择性加氢制备邻氯苯胺反应,其催化活性最高为单金属催化活性的2倍.这是由于Co和Ni物种之间存在协同效应.氢气程序升温脱附结果显示,Co/Ni合金的生成使得Co50Ni50/C催化剂产生了新的催化活性位,因而其活性显著提高.
A simple hydrothermal / solvothermal method was used to synthesize a three-dimensional Co-Ni / C bimetallic catalyst by subsequent heat treatment in a nitrogen atmosphere, which was composed of interwoven carbon sheets with highly dispersed metal nanoparticles.With the Co / Ni molar ratio increased, the particle size of the metal particles was gradually reduced from 26nm to about 4nm.The catalyst was used for the selective hydrogenation of o-chloronitrobenzene to o-chloroaniline, and the highest catalytic activity was 2 This is due to the synergistic effect between the Co and Ni species.The results of hydrogen temperature programmed desorption show that the Co / Ni alloy produces a new catalytic active site for the Co50Ni50 / C catalyst and its activity is significantly increased.