Molybdenum carbides possess both platinum-like properties and a certain degree of semi-conductivity and are good candidates as photothermal CO₂ hydrogenation catalysts. Herein, the crystal structure and photothermocatalytic synergistic effects on CO₂ hydrogenation were explored. The catalysts of β-Mo₂C, α-MoC, and their mixed phases were prepared by adjusting the carburization circumstances of the precursor, and their structural, surface, photothermal conversion and activity for CO₂ hydrogenation under thermal and photothermal conditions were systematically investigated. It is found that the generated carbon vacancies of the α-MoC phase promote the adsorption of CO₂, whereas H₂ adsorption is facilitated over β-Mo₂C. Consequently, α-MoC and β-Mo₂C mixed phases are more favorable for CO₂ hydrogenation at 130 °C. As compared to thermocatalysis, the activity of photothermal catalytic CO₂ hydrogenation increases by at least 45 % on the same catalysts, due to the light-promoted surface intermediate (formate species) dissociation. The present work supplies a new insight into photothermocatalytic synergistic effect.

碳化钼具有类似铂的性质和一定程度的半导电性，并且是光热CO ₂加氢催化剂的良好候选者。在此，探讨了晶体结构和光热催化对CO ₂加氢的协同作用。β-Mo系的催化剂₂ C，α-的MoC，和它们的混合相通过调节前体的渗碳情况制备，并且它们的结构，表面，光热的CO转化率和活性₂的热和光热条件下氢化进行了系统研究。发现产生的α-MoC相的碳空位促进了CO ₂的吸附，而H ₂吸附上方β-沫促进₂ C.因此，α-交通部和β-沫₂ C混合相对于CO更有利₂在130℃下氢化。与热催化相比，由于光促进的表面中间体（甲酸酯类）的分解，在相同的催化剂上，光热催化CO ₂氢化的活性至少增加了45％。目前的工作提供了对光热催化协同效应的新见解。