Vanadium-doped Molybdenum Carbides as Promising Catalyst for C-N/C-C coupling reactions
Vanadium-doped molybdenum carbides (V-Mo2C) encapsulated in nitrogen-doped carbon has been prepared by annealing phosphovanadomolybdate (PMo10V2O405-)-paired ionic hybrids as the carbonization precursors. The catalysts V-Mo2C@NCt are pyrolyzed at various temperatures and characterized by XRD, BET, XPS, TEM, Raman. The synthesized MoCV@NC800 shows a pomegranate-like structure with V-Mo2C nanocrystals well-dispersed in the NC shell. Importantly, MoCV@NC800 reveals extremely good catalytic activity and stability in the oxidative C-N coupling of amines to imines under mild conditions, which is much better than those of monometallic carbides control catalysts. It is also observed that MoCV@NC800 exhibited high catalytic activity for the C-C bond couplings of alcohols and ketones. This work might provide a signiﬁcant and interesting approach for designing more transition metal carbides as efficient organic synthesis heterogeneous catalysts.