Formaldehyde is a carcinogenic chemical that seriously endangers the health of human body, the elimination of formaldehyde pollutant in enclosed spaces provides safety for breathing. This work studied Pt/CeO catalysts for photothermal formaldehyde oxidative elimination. In comparison with photocatalysis and thermocatalysis, the photothermal catalysis is a more promising technique to eliminate formaldehyde from the synergism between active oxygen species including mobile surface lattice oxygen, adsorbed oxygen and superoxide radical, and from the photo-induced thermal effect on catalyst surface when irradiating sunlight. The oxidative abilities of the active oxygen species were promoted by the thermal effect, which consequently leads to the improved formaldehyde conversion in photothermal catalysis. The mobile surface lattice oxygen, adsorbed oxygen and superoxide radical on the Pt/CeO catalysts were characterized by H-TPR, O-TPD and ESR, the light adsorptions of the catalysts were evaluated by UV–vis and the actual surface temperatures of the catalysts were measured by thermocouple. This work verifies the more powerful photothermal catalysis for formaldehyde oxidation, which could be extended to other reactions for performance enhancements.

中文翻译：

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Pt/CeO2表面光致热效应促进光热催化甲醛氧化性能

甲醛是一种致癌化学物质，严重危害人体健康，消除密闭空间内的甲醛污染物，为呼吸提供安全。本工作研究了用于光热氧化消除甲醛的 Pt/CeO 催化剂。与光催化和热催化相比，光热催化通过活性氧物种（包括移动表面晶格氧、吸附氧和超氧自由基）之间的协同作用以及光照射时催化剂表面的光致热效应，是一种更有前景的甲醛消除技术。阳光。热效应促进了活性氧的氧化能力，从而提高了光热催化中甲醛的转化率。采用H-TPR、O-TPD和ESR表征了Pt/CeO催化剂上的移动表面晶格氧、吸附氧和超氧自由基，并通过UV-vis和催化剂的实际表面温度评价了催化剂的光吸附性能。通过热电偶测量。这项工作验证了甲醛氧化的更强大的光热催化作用，可以扩展到其他反应以提高性能。