Extra-heavy olefins (C), 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 C, though there is a trade-off between enhancing C-C coupling and suppressing further hydrogenation of olefins. Herein, we achieve selective production of C via the overall conversion of CO and water, denoted as Kölbel-Engelhardt synthesis (KES), in polyethylene glycol (PEG) over a mixture of Pt/MoN and Ru particles. KES provides a continuously high CO/H 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 CO to hydrocarbons reaches the theoretical minimum, and the C yield reaches its maximum of 1.79 mmol with a selectivity (among hydrocarbons) of as high as 40.4%.
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| http://dx.doi.org/10.1038/s41467-023-37599-2 | DOI Listing |
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