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Indexed by:Journal Papers

Date of Publication:2020-08-01

Journal:MOLECULAR CATALYSIS

Included Journals:SCIE

Volume:492

ISSN No.:2468-8231

Key Words:Mo-dopamine; Deoxygenation; beta-Mo2C; alpha-MoC1-x; Diphenyl ether

Abstract:The controllable synthesis of molybdenum carbides with different phases by a facile and environmentally friendly method and understanding their structure-performance relationship are still challenges. In this work, lamellar beta-Mo2C and alpha-MoC1-x have been synthesized by a self-assembly synthetic route using Mo-dopamine as single source without any template and additive at a relatively low carburization temperature. The introduction of H-2 fortifies the reducibility of the system and accelerates the carburization process and phase transformation. The structure-performance relationship was also investigated in the hydrodeoxygenation (HDO) of diphenyl ether. Thereinto, beta-Mo2C exhibits 99.9% conversion and 95.2% selectivity to benzene, while alpha-MoC1-x shows only 74.6% conversion with 84.8% selectivity to benzene and 12.7% to O-containing product phenol at the same conditions. The superior HDO performance of beta-Mo2C can be attributed to the more active sites in beta-Mo2C than alpha-MoC1-x. beta-Mo2C with stronger thermostability exhibits long-term stability during the HDO process. The results show that beta-Mo2C is a promising catalyst for lignin valorization.