Influence of Carbon Content in Ni-Doped Mo₂C Catalysts on CO Hydrogenation to Mixed Alcohol

• Main Authors: Zhenjiong Hao, Xiaoshen Li, Ye Tian, Tong Ding, Guohui Yang, Qingxiang Ma, Noritatsu Tsubaki, Xingang Li
• Format: Article
• Language: English
• Published: MDPI AG 2021-02-01
• Series: Catalysts
• Subjects: Mo₂C; mixed alcohol synthesis; Ni doping; electron interaction; lattice carbon atoms
• Online Access: https://www.mdpi.com/2073-4344/11/2/230

Herein, we synthesize the Ni-doped Mo₂C catalysts by a one-pot preparation method to illuminate the effect of the number of carbon atoms in Mo₂C lattice on CO hydrogenation to mixed alcohol. The Ni doping inhibits the agglomeration of Mo₂C crystals into large particles and the surface carbon deposition, which increase the active surface area. In addition, the interaction between Ni and Mo increases the electron cloud density of Mo species and promotes the non-dissociative adsorption and insertion of CO. Especially, our results indicate that with the increase of the nickel content, the number of carbon atoms in Mo₂C lattice on the surface of the catalyst shows a volcano type variation. The low carbon content induces the formation of coordination unsaturated molybdenum species which exhibit the higher catalytic activity and mixed alcohol selectivity than other molybdenum species. Among the catalysts, the MC-Ni-1.5 catalyst with Ni/Mo molar ratio of 1.5:8.5, which has the largest amount of coordination unsaturated molybdenum species, shows the highest space-time yield of mixed alcohols, which is three times higher than that of the Mo₂C catalyst.