Citation: Longlong Geng, Jinling Song, Bin Zheng, Shujie Wu, Wenxiang Zhang, Mingjun Jia, Gang Liu. Aerobic oxidative coupling of alcohols and amines to imines over iron catalysts supported on mesoporous carbon[J]. Chinese Journal of Catalysis, ;2016, 37(9): 1451-1460. doi: 10.1016/S1872-2067(16)62506-8 shu

Aerobic oxidative coupling of alcohols and amines to imines over iron catalysts supported on mesoporous carbon

Key Laboratory of Surface and Interface Chemistry of Jilin Province, College of Chemistry, Jilin University, Changchun 130012, Jilin, China

Received Date: 30 May 2016
Revised Date: 12 July 2016

Fund Project: This work was supported by the National Natural Science Foundation of China(21473073, 21473074) and the "13th Five-Year" Science and Technology Research of the Education Department of Jilin Province(2016403).

Direct oxidative coupling of an alcohol and amine, with air or molecular oxygen as the oxygen source, is an environmentally friendly method for imine synthesis. We developed an Fe catalyst supported on mesoporous carbon(denoted by FeO_x/HCMK-3) for this reaction with excellent activity and recyclability. FeO_x/HCMK-3 was prepared by impregnating HNO₃-treated mesoporous carbon(CMK-3) with iron nitrate solution. The highly dispersed FeO_x species give FeO_x/HCMK-3 high reducibility and are responsible for the high catalytic performance. Imine synthesis over FeO_x/HCMK-3 follows a redox mechanism. The oxygen species in FeO_x/HCMK-3 participate in the reaction and are then regenerated by oxidation with molecular O₂. The reaction involves two consecutive steps: oxidative dehydrogenation of an alcohol to an aldehyde and coupling of the aldehyde with an amine to give an imine. Oxidative dehydrogenation of the alcohol is the rate-determining step in the reaction.
- Iron catalyst,
- Imine synthesis,
- Oxidative coupling,
- Mesoporous carbon,
- Molecular oxygen
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