Abstract
The metastable phase molybdenum carbide-based (α-MoC1-x) catalysts stand out as a class of the most promising representatives among the non-sulfide catalysts for the synthesis of higher alcohols (HAS) from syngas (CO/H2) due to their noble metal-like characteristics, resistance to coking, sulfur tolerance and weak C–O bond dissociation. However, the synthesis of α-MoC1-x commonly involves temperature-programmed ammonification and carburization (TPAC) or the consumption of noble metals. The α-MoC1-x prepared by TPAC usually exhibited large particle size, low dispersion and poor catalytic performance. Herein, we developed a facile and continuous thermal plasma method for synthesizing nanosized α-MoC1-x, which was highly dispersed on amorphous carbon (α-MoC1-x/C-Pla). Compared with the α-MoC1-x prepared by TPAC method (α-MoC1-x-TPAC), the α-MoC1-x/C-Pla catalyst exhibited higher CO conversion and excellent stability. The high dispersion and reactant adsorption/desorption capacity of α-MoC1-x/C-Pla contributed to its high catalytic activity, while the anti-aggregation property of the nanosized α-MoC1-x in α-MoC1-x/C-Pla conferred the high stability for the α-MoC1-x/C-Pla catalyst.
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