Investigations on the Zn/Fe ratio and activation route during CO hydrogenation over porous iron/spinel catalysts

In this article, a simplified iron/spinel catalyst system was adopted as the Fischer–Tropsch to light olefins (FTO) catalyst to rule out disturbances from efficient promoters (e.g., K or combination of S/Na). Supported by regular supports (e.g., Al 2 O 3 , carbon, etc.), unpromoted iron catalysts co...

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Published in:Reaction kinetics, mechanisms and catalysis mechanisms and catalysis, 2020-04, Vol.129 (2), p.755-772
Main Authors: Xing, Yu, Guo, Xuehui, Jia, Gaopeng, Fang, Shaoming, Zhao, Chenxi, Liu, Zhenxin
Format: Article
Language:English
Subjects:
Catalysis
Chemistry
Chemistry and Materials Science
Industrial Chemistry/Chemical Engineering
Physical Chemistry
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Summary:In this article, a simplified iron/spinel catalyst system was adopted as the Fischer–Tropsch to light olefins (FTO) catalyst to rule out disturbances from efficient promoters (e.g., K or combination of S/Na). Supported by regular supports (e.g., Al 2 O 3 , carbon, etc.), unpromoted iron catalysts commonly have a maximum C 2 = –C 4 = hydrocarbon distribution below 28%. Supported by a composite oxide support (i.e., nominal composition, ZnAl 4 O 7 , calcined at 350 °C), our porous, unpromoted iron catalyst exhibits a maximum C 2 = –C 4 = hydrocarbon distribution of 40%, achieving a significant increase by ca. 42% in comparison with regular supports. Appropriate lifting of atomic Zn/Fe ratio, as well as, reducing at lower temperature plus mild carburization, both can make a supported iron catalyst more efficient in hindering C–C coupling and producing light olefins. The structure of ZnAl 4 O 7 support remains stable in iron catalysts during CO hydrogenation.
ISSN:1878-5190
1878-5204
DOI:10.1007/s11144-020-01751-6