Indexed by:Journal Papers

Date of Publication:2017-01-01

Journal:ACS CATALYSIS

Included Journals:SCIE、EI、Scopus

Volume:7

Issue:1

Page Number:912-918

ISSN No.:2155-5435

Key Words:molybdenum carbide; copper; reverse water-gas shift; CO2 dissociation; CO selectivity

Abstract:Cu-oxide catalysts have a tendency to deactivate dramatically in reverse water gas shift (RWGS) reaction, because of the aggregation of supported copper particles at high temperatures. Herein, beta-Mo2C, which is a typical type of transition-metal carbide, has been demonstrated to be capable of dispersing and stabilizing copper particles. Cu//beta Mo2C catalysts exhibit good catalytic activity and stability for the RWGS reaction. Under relatively high weight hourly space velocity (WHSV = 300 000 mL/g/h), the optimized 1 wt % Cu/beta-Mo2C exhibits superior activity over traditional oxide supported Pt- and Cu-based catalysts. The activity was well maintained in a 40 h stability test, and the catalyst shows stable reactivity in a six-cycle start-up cool-down experiment. Detailed structure characterizations demonstrate that the strong interaction between Cu and beta-Mo2C effectively promotes the dispersion of supported copper and prevents the aggregation of Cu particles, which accounts for the extraordinary activity and stability for the RWGS reaction.