组合纳米Pt/C催化剂的邻氯硝基苯加氢性能

Hydrogenation of o-Chloronitrobenzene by Platinum Nanoparticles on Activated Carbon

通过金属有机化合物Pt2(dba)3(dba为二亚苄基丙酮)分解的方法,制得了可溶性纳米Pt颗粒.采用透射电子显微镜对其观察发现,调节氢气分解压力可以控制Pt颗粒的大小.将可溶性Pt纳米颗粒负载于活性炭上,制得了粒径可控的Pt/C催化剂.该催化剂用于邻氯硝基苯加氢反应时,表现出非常高的催化性能.在氢气分解压力为2.0MPa时制备的0.5%Pt/C,其Pt纳米粒径为2.8nm左右,在不加脱卤抑制剂、反应温度为60oC和氢气压力为1.0MPa的条件下,脱卤率为1.6%,TOF达到39.8s-1.

The assembled Pt catalyst was prepared using activated carbon as a support to capture ＂unprotected＂ Pt nanoparticles obtained from the decomposition of Pt2（dba）3 （dba = dibenzene acetone）. Transmission electron microscopy showed that the size of the Pt nanoparticles depended on the decomposition pressure. The catalytic activity was evaluated by the liquid-phase hydrogenation of o-chloronitrobenzene. The Pt/C catalyst exhibited high conversion and selectivity. When the Pt nanoparticles were prepared at 2.0 MPa of hydrogen pressure and 30℃, the average size of the Pt nanoparticles was 2.8 nm with 0.5% Pt loading. Under the hydrogenation conditions of 60℃ and 1.0 MPa hydrogen pressure, the dehalogenation rate was less than 1.67% while the TOF was 39.8 s^-1.