Chinese Journal of Catalysis ›› 2015, Vol. 36 ›› Issue (11): 2030-2035.DOI: 10.1016/S1872-2067(15)60904-4

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High selectivity to p-chloroaniline in the hydrogenation of p-chloronitrobenzene on Ni modified carbon nitride catalyst

Teng Fu, Pei Hu, Tao Wang, Zhen Dong, Nianhua Xue, Luming Peng, Xuefeng Guo, Weiping Ding   

  1. Key Laboratory of Mesoscopic Chemistry, School of Chemistry and Chemical Engineering, Nanjing University, Nanjing 210093, Jiangsu, China
  • Received:2015-04-10 Revised:2015-05-16 Online:2015-11-02 Published:2015-11-02

Abstract:

A nanocomposite composed of Ni modified carbon nitride was synthesized and used in the hydrogenation of p-chloronitrobenzene. H/D exchange demonstrated that the hydrogen chemisorbed on the surface of this nanocomposite catalyst had a hydrogen atom density of 0.65/nm2. It was active for hydrogenation but its activity was inferior to the hydrogen adsorbed on a Ni/Al2O3 catalyst. Catalytic tests showed that this catalyst possessed a lower activity than Ni/Al2O3 but the selectivity towards p-chloroaniline was above 99.9%. Even at high conversion, the catalyst maintained high selectivity, which was attributed to the unique surface property of the catalyst and the absence of a site for the adsorption of p-chloronitrobenzene, which prevents the C-Cl bond from breaking.

Key words: Hydrogenation, p-Chloronitrobenzene, Carbon nitride, Nickel, Selectivity