期刊
APPLIED CATALYSIS B-ENVIRONMENTAL
卷 316, 期 -, 页码 -出版社
ELSEVIER
DOI: 10.1016/j.apcatb.2022.121640
关键词
CO2 hydrogenation; High-valued olefins; Strontium promoter; Fe-based catalyst; Catalytic stability
资金
- National Natural Science Foundation of China [21802138, 21773234, 22078315]
- Transformational Technologies for Clean Energy and Demonstration
- Strategic Priority Research Program of Chinese Academy of Sciences [XDA 21090203]
- Youth Innovation Promotion Association of Chinese Academy of Sciences [2020189, 2018214]
- Youth Science and Technology Star Project Support Program of Dalian City [2021RQ123]
- Dalian Institute of Chemical Physics (DICP) [I202138, I202012]
- University of Chinese Academy of Sciences (UCAS)
We report a Sr and Na co-decorated Fe catalyst that can synthesize high-valued olefins in a stable manner for over 500 hours. The excellent catalytic performance is attributed to the cooperative effect of Sr and Na on different sites in the catalyst.
Direct catalytic hydrogenation of CO2 is a highly promising route for olefin synthesis. However, achieving high olefin selectivity is predicated on the development of a selective catalyst with acceptable yield and stability. Herein, we report a Sr and Na co-decorated Fe catalyst that showed stable performance in the synthesis of high-valued olefins (ethene, propene and linear alpha-olefins) with space-time yield up to 290 mg g(cat)(-1) h(-1) without significant deactivation for over 500 h on-stream. The excellent catalytic performance is attributed to the cooperative effect of Sr and Na on the distinct sites (Fe5C2, Fe3C, Fe3O4) in catalyst. In particular, SrCO3 promoted the dispersion of binding Fe sites that facilitated the formation and stabilization of FeCx phase. Simultaneously, Sr contributed to the electron interaction between Na and Fe species. The dual effect of Sr as both structural and electronic promoters coordinatively improved C-O dissociative adsorption and subsequent C-C coupling, thus facilitated CO2 hydrogenation.
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