辛醇与氨胺化反应催化剂Co/SiO_(2)的制备与性能

Preparation and performance of Co/SiO_(2) catalyst for amination reaction of octanol with ammonia

采用溶胶-凝胶法制备SiO_(2)负载的钴催化剂Co/SiO_(2)-t,并对催化剂进行SEM、XRD、XPS、H_(2)-TPR、BET等表征,以1-辛醇与氨的胺化为模型反应,研究焙烧温度对催化剂结构、性能的影响。结果表明,随着焙烧温度的升高,催化剂Co/SiO_(2)-t的比表面积呈现先增加后降低的趋势,平均孔径逐渐增大,Co结晶度逐渐升高,粒径尺寸逐渐增大,Co分散度与还原度逐渐降低。焙烧温度为550℃的催化剂比表面积最大、催化性能最佳。催化剂Co/SiO_(2)-550的Co平均粒径为13.22 nm,比表面积为288 m^(2)/g,平均孔径为7.83 nm,还原度为83.75%,分散度为7.42%。催化剂Co/SiO_(2)-550的转化率为93.12%,对1-辛胺的选择性为71.34%。

The cobalt catalyst Co/SiO_(2)-t supported by silica was prepared by sol-gel method,and the catalyst was characterized by SEM,XRD,XPS,H_(2)-TPR,BET,etc.The amination of 1-octanol with ammonia was used as a model reaction to study the effect of calcination temperature on the structure and performance of the catalyst.The results showed that with the increase of calcination temperature,the specific surface area of the catalyst Co/SiO_(2)-t showed a trend of increasing and then decreasing,the average pore diameter gradually increased,and the crystallinity of Co gradually increased,the particle size gradually increased,the degree of dispersion and reduction of Co gradually decreased.The catalyst calcined at 550℃ has the largest specific surface area and the best catalytic performance.For catalyst Co/SiO_(2)-550,the average particle size of Co is 13.22 nm,S BET is 288 m^(2)/g,the average pore size is 7.83 nm,the reduction degree and dispersion degree are 83.75% and 7.42%.The conversion rate of Co/SiO_(2)-550 and the selectivity to 1-octylamine are 93.12% and 71.34%,respectively.