期刊
ACS CATALYSIS
卷 7, 期 1, 页码 912-918出版社
AMER CHEMICAL SOC
DOI: 10.1021/acscatal.6b02991
关键词
molybdenum carbide; copper; reverse water-gas shift; CO2 dissociation; CO selectivity
资金
- National Natural Foundation of China [21373037, 21577013, 21673273, 21473003, 91645115]
- 973 Project [2013CB933100]
- Fundamental Research Funds for the Central Universities [DUT15TD49, DUT16ZD224]
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.
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