Confined small-sized cobalt catalysts stimulate carbon-chain growth reversely by modifying ASF law of Fischer–Tropsch synthesis

Qingpeng Cheng, Ye Tian, Shuaishuai Lyu, Na Zhao, Kui Ma, Tong Ding, Zheng Jiang, Lihua Wang, Jing Zhang, Lirong Zheng, Fei Gao, Lin Dong, Noritatsu Tsubaki () and Xingang Li ()
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Qingpeng Cheng: Tianjin University
Ye Tian: Tianjin University
Shuaishuai Lyu: Tianjin University
Na Zhao: Tianjin University
Kui Ma: Tianjin University
Tong Ding: Tianjin University
Zheng Jiang: Chinese Academy of Sciences
Lihua Wang: Chinese Academy of Sciences
Jing Zhang: Chinese Academy of Sciences
Lirong Zheng: Chinese Academy of Sciences
Fei Gao: Nanjing University
Lin Dong: Nanjing University
Noritatsu Tsubaki: University of Toyama
Xingang Li: Tianjin University

Nature Communications, 2018, vol. 9, issue 1, 1-9

Abstract: Abstract Fischer–Tropsch synthesis (FTS) is a promising technology to convert syngas derived from non-petroleum-based resources to valuable chemicals or fuels. Selectively producing target products will bring great economic benefits, but unfortunately it is theoretically limited by Anderson–Schulz–Flory (ASF) law. Herein, we synthesize size-uniformed cobalt nanocrystals embedded into mesoporous SiO2 supports, which is likely the structure of water-melon seeds inside pulps. We successfully tune the selectivity of products from diesel-range hydrocarbons (66.2%) to gasoline-range hydrocarbons (62.4%) by controlling the crystallite sizes of confined cobalt from 7.2 to 11.4 nm, and modify the ASF law. Generally, larger Co crystallites increase carbon-chain growth, producing heavier hydrocarbons. But here, we interestingly observe a reverse phenomenon: the uniformly small-sized cobalt crystallites can strongly adsorb active C* species, and the confined structure will inhibit aggregation of cobalt crystallites and escape of reaction intermediates in FTS, inducing the higher selectivity towards heavier hydrocarbons.

Date: 2018
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DOI: 10.1038/s41467-018-05755-8

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