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Photothermal Fischer-Tropsch synthesis(FTS)has been extensively studied,but few reports were focused on systematically exploring the influence of support on catalytic performance.Herein,a series of Fe5C2-based catalysts with different supports was fabricated via a one-step wet-chemical method for photothermal conversion of syngas to lower olefins.Under light irradiation,the optimized Fe5C2/α-Al2O3 catalyst demonstrated remarkable photothermal FTS activity,delivering selectivity to lower olefins of 50.3％with a CO conversion rate of 52.5％.Characterization studies using X-ray diffraction and M?ssbauer spectroscopy analysis revealed that the active catalyst mainly contained Fe5C2 nanoparticles on α-Al2O3 support.It was found that the weak interaction between active phase and α-Al2O3 could promote the formation of Fe5C2,which contributed to the high selectivity to lower olefins.