Photothermal Tandem Catalysis of CH₄ Reforming and Fischer‐Tropsch Synthesis to Produce Syngas and C₂₊ Hydrocarbons

Photothermal catalysis is a promising approach for converting renewable solar energy to storable chemical energy. However, a critical challenge in photothermal catalysis lies in the temperature gradients formed under irradiation within the catalyst bed. In the present study, this temperature gradient is utilized to promote tandem reactions of the highly endothermic CH 4 reforming at the high‐temperature zone to produce syngas and the exothermic Fischer‐Tropsch synthesis (FTS) at the low‐temperature zone to yield C 2+ hydrocarbons. This study demonstrates that C 2+ hydrocarbons such as ethane and ethylene are formed using a single photoreactor with a temperature gradient from CO 2 and CH 4 as carbon sources via the tandem reactions over SiO 2 ‐encapsulated Co–Ni alloy catalysts. Almost no C 2+ formation under uniform temperature conditions in an electric furnace highlights the essential role of the temperature gradient in C 2+ formation. Moreover, this study reveals that the fabrication of the porous SiO 2 shell and the addition of steam into the feed gas have a crucial impact on the C 2+ formation rate. This work may open new avenues for tandem reaction systems from two greenhouse gases of CO 2 and CH 4 into value‐added C 2+ hydrocarbons.