Direct synthesis of extra-heavy olefins from carbon monoxide and water

Chuanhao Wang, Junjie Du, Lin Zeng, Zhongling Li, Yizhou Dai, Xu Li, Zijun Peng, Wenlong Wu, Hongliang Li () and Jie Zeng ()
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Chuanhao Wang: University of Science and Technology of China
Junjie Du: University of Science and Technology of China
Lin Zeng: University of Science and Technology of China
Zhongling Li: University of Science and Technology of China
Yizhou Dai: University of Science and Technology of China
Xu Li: University of Science and Technology of China
Zijun Peng: University of Science and Technology of China
Wenlong Wu: University of Science and Technology of China
Hongliang Li: University of Science and Technology of China
Jie Zeng: University of Science and Technology of China

Nature Communications, 2023, vol. 14, issue 1, 1-8

Abstract: Abstract Extra-heavy olefins (C12+=), feedstocks to synthesize a wide range of value-added products, are conventionally generated from fossil resources via energy-intensive wax cracking or multi-step processes. Fischer-Tropsch synthesis with sustainably obtained syngas as feed-in provides a potential way to produce C12+=, though there is a trade-off between enhancing C-C coupling and suppressing further hydrogenation of olefins. Herein, we achieve selective production of C12+= via the overall conversion of CO and water, denoted as Kölbel-Engelhardt synthesis (KES), in polyethylene glycol (PEG) over a mixture of Pt/Mo2N and Ru particles. KES provides a continuously high CO/H2 ratio, thermodynamically favoring chain propagation and olefin formation. PEG serves as a selective extraction agent to hinder hydrogenation of olefins. Under an optimal condition, the yield ratio of CO2 to hydrocarbons reaches the theoretical minimum, and the C12+= yield reaches its maximum of 1.79 mmol with a selectivity (among hydrocarbons) of as high as 40.4%.

Date: 2023
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DOI: 10.1038/s41467-023-37599-2

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