C_(3)N_(4)原位负载镍金属催化剂上对氯硝基苯选择性加氢性能  

Performance of C_(3)N_(4)in-situ supported nickel metal catalyst for selective hydrogenation of p-chloronitrobenzene

作　　者：徐浩[1] 马卫华[1] Xu Hao;Ma Weihua(Nanjing University of Science and Technology,Nanjing 210094,Jiangsu,China)

机构地区：[1]南京理工大学,江苏南京210094

出　　处：《工业催化》2023年第10期75-81,共7页Industrial Catalysis

摘　　要：采用原位直接焙烧的方法制备镍负载型催化剂Ni@C_(3)N_(4),用于对氯硝基苯加氢催化。BET、XRD和TEM等方法对催化剂表征表明,催化剂具有高比表面积、高活性及二维堆叠结构。针对不同镍负载量的催化剂,考察反应压力和反应温度对于对氯硝基苯加氢反应的影响,并对催化剂稳定性进行评价。结果表明,当镍盐与三聚氰胺质量比为5∶5时,催化效果最佳。在反应压力1 MPa和反应温度60℃时,催化剂展现出优异的对氯硝基苯加氢催化性能,对氯硝基苯转化率为99.9%,对氯苯胺选择性高于95%,催化剂使用5次后活性未明显降低。The catalysts of nickel supported on C_(3)N_(4)(Ni@C_(3)N_(4))were prepared by in-situ direct calcination and characterized by BET,XRD and TEM.The catalytic performance was investigated using p-chloronitrobenzene hydrogenation as probe reaction.The results showed that the catalyst had high activity,large specific surface area and two-dimensional stacking structure.The effects of reaction pressure and temperature on the hydrogenation of p-chloronitrobenzene were investigated for the catalysts with different nickel loads,and the stability of the catalysts was evaluated.The results showed that when the mass ratio of nickel salt to urea was 5∶5,the catalyst performance was the best.When the reaction pressure was 1 MPa and the temperature was 60℃,the catalyst showed excellent catalytic performance for the hydrogenation of p-chloronitrobenzene.The conversion of p-chloronitrobenzene was 99.9%and the selectivity of p-chloroaniline higher than 95%.The activity of the catalyst did not decrease significantly after 5 times of use.

关 键 词：有机化学工程 镍基催化剂 对氯硝基苯 催化加氢 对氯苯胺 

分 类 号：TQ246.13[化学工程—有机化工] TQ426.6