CO₂ reforming or dry reforming of methane (DRM) produces syngas with a low carbon footprint, but the efficiency and stability of DRM remains a challenge. Herein, we report an efficient photo-thermo-chemical DRM (PTC-DRM) process on a Pt supported CeO₂ catalyst with Zn doping and surface atomic layer deposition (ALD)-enabled MgO overcoating using concentrated sunlight as the energy input. Under 30 suns irradiation at 600 °C, high syngas production rates of 356 and 516 mmol g⁻¹ h⁻¹ for H₂ and CO are achieved, which are more than 9 and 3 times larger than those obtained in the thermally driven DRM. Moreover, the light illumination stabilizes the dry reforming process without deactivation, which results from the in situ generation of oxygen vacancy on CeO₂ by photo-induced electrons that enables stable CO₂ thermo-activation. The ALD coating also reduces surface charge recombination through passivating surface states, thereby enhancing photocatalytic activity.

甲烷（DRM）的CO ₂重整或干重整产生的合成气具有低碳足迹，但是DRM的效率和稳定性仍然是一个挑战。本文中，我们报告了在Pt负载的CeO ₂催化剂上进行高效的光热化学DRM（PTC-DRM）工艺，该工艺具有Zn掺杂和表面原子层沉积（ALD）启用的MgO外涂层，使用集中的阳光作为能量输入。在600°C的30个太阳照射下，H _2的合成气生产率高，分别为356和516 mmol g ^-1 h ^-1所获得的二氧化碳和二氧化碳比热驱动DRM所获得的二氧化碳大9倍和3倍。此外，光照射可稳定干燥重整过程而不会失活，这是由于光致电子在CeO ₂上原位产生氧空位而引起的，该光致电子可实现稳定的CO ₂热活化。ALD涂层还通过钝化表面状态来减少表面电荷复合，从而增强光催化活性。