期刊
CHEMCATCHEM
卷 12, 期 12, 页码 3306-3320出版社
WILEY-V C H VERLAG GMBH
DOI: 10.1002/cctc.202000347
关键词
Carbon dioxide; Heterogeneous catalysis; Hydrogenation; Light olefins; K; Fe atomic ratio
资金
- Thailand Research Fund
- Kasetsart University [RSA6280007]
- Center of Excellence on Petrochemical and Materials Technology (PETROMAT)
- Nanotechnology Center (NANOTEC), NSTDA
- Ministry of Science and Technology, Thailand, through its program of Research Network of NANOTEC (RNN)
- Vidyasirimedhi Institute of Science and Technology
- Austrian Science Fund (FWF) [SFB F4502 FOXSI, DK+ W1243]
Selective CO2 hydrogenation to light olefins over Fe-Co/K-Al2O3 catalysts was enhanced by tuning bonding strengths of adsorbed species by varying the content of the K promotor. Increasing the K/Fe atomic ratio from 0 to 0.5 increased the olefins/paraffins (O/P) ratio by 25.4 times, but then slightly raised upon ascending K/Fe to 2.5. The positive effect of K addition is attributed to the strong interaction of H adsorbed with the catalyst surface caused by the electron donor from K to Fe species. Although the Fe-Co/K-Al2O3 catalyst with K/Fe=2.5 reached the highest O/P ratio of 7.6, the maximum yield of light olefins of 16.4 % was achieved by the catalyst promoted with K/Fe of 0.5. This is explained by the considerable reduction of amount of H-2 adsorbed on the catalyst surface with K/Fe=2.5.
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