期刊
ACS CATALYSIS
卷 7, 期 8, 页码 5500-5512出版社
AMER CHEMICAL SOC
DOI: 10.1021/acscatal.7b01469
关键词
CO hydrogenation; higher alcohols; copper; Hagg iron carbide; synergistic effect; reaction mechanism
资金
- U.S. Department of Agriculture [2012-10008-20302]
- National Natural Science Foundation of China [21476155, 21276003]
- Natural Science Foundation of Shanxi Province [2014011012-2]
- Program for the Top Young Academic Leaders of Higher Learning Institutions of Shanxi
- Top Young Innovative Talents of Shanxi
- U.S. Department of Energy, Office of Science, Office of Basic Energy Sciences [DE-AC02-06CH11357]
- U.S. Department of Energy, Office of Science, Office of Basic Energy Sciences, Chemical Sciences, Geosciences, and Biosciences Division, Catalysis Program [DE-SC0014561]
CO hydrogenation to higher alcohols (C2+OH) provides a promising route to convert coal, natural gas, shale gas, and biomass feedstocks into value-added chemicals and transportation fuels. However, the development of nonprecious metal catalysts with satisfactory activity and well-defined selectivity toward C2+OH remains challenging and impedes the commercialization of this process. Here, we show that the synergistic geometric and electronic interactions dictate the activity of Cu-0-chi-Fe5C2 binary catalysts for selective CO hydrogenation to C2+OH, outperforming silica-supported precious Rh-based catalysts, by using a combination of experimental evidence from bulk, surface-sensitive, and imaging techniques collected on real and high-performance Cu-Fe binary catalytic systems coupled with density functional theory calculations. The closer is the d-band center to the Fermi level of Cu-0-chi-Fe5C2(510) surface than those of chi-Fe5C2(510) and Rh(111) surface, and the electron-rich interface of Cu-0-chi-Fe5C2(510) due to the delocalized electron transfer from Cu-0 atoms, facilitates CO activation and CO insertion into alkyl species to C-2-oxygenates at the interface of Cu-0-chi-Fe5C2(510) and thus enhances C2H5OH selectivity. Starting from the CHCO intermediate, the proposed reaction pathway for CO hydrogenation to C2H5OH on Cu-0-chi-Fe5C2(510) is CHCO + (H) -> CH2CO + (H) -> CH3CO + (H) -> CH3CHO + (H) -> CH3CH2O + (H) -> C2H5OH. This study may guide the rational design of high-performance binary catalysts made from earth-abundant metals with synergistic interactions for tuning selectivity.
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