Combining electrolysis with thermocatalysis for dry reforming of methane in a naturally stratifying liquid alloy-salt catalytic system
Dry reforming of methane (CH 4 ) with carbon dioxide (CO 2 ) is an attractive technology for producing value-added syngas and mitigating greenhouse gas emission. However, this process usually requires high energy input due to the intrinsic inertness of CH 4 and CO 2 . Besides, the widely investigated solid Ni-based catalysts typically suffer from coking and sintering issues, leading to degradation in catalytic performance. Liquid alloys and molten salts are emerging as promising catalytic materials for CH 4 dry reforming. In this work, we combine electrolysis with thermocatalysis for CH 4 dry reforming in a naturally stratifying liquid alloy-salt system, which achieves effective and stable catalytic performance under relatively mild operation conditions. The conversions of CH 4 and CO 2 reach 37% and 95%, respectively, in a bubble column reactor comprising Ni–Bi alloy and LiNaCO 3 during constant current electrolysis at 1.5 A and 900 °C. The selectivities of H 2 and CO were maintained at 85% and 92%, respectively. Ab initio molecular dynamics simulation shows that the oxides of both Ni and Bi promote the C–H bond dissociation. Therefore, the electrochemical process combine electrolysis with thermocatalysis in the liquid alloy-salt system represents a promising approach to achieving effective and stable CH 4 dry reforming.
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