Xiamen Key Laboratory of Materials for Gaseous Pollutant Control, Institute of Urban Environment, Chinese Academy of Sciences, Xiamen 361021, China; Key Laboratory of Urban Pollutant Conversion, Institute of Urban Environment, Chinese Academy of Sciences, Xiamen 361021, China; CAS Center for Excellence in Regional Atmospheric Environment, Institute of Urban Environment, Chinese Academy of Sciences, Xiamen 361021, China; University of Chinese Academy of Sciences, Beijing 100049, China.
Xiamen Key Laboratory of Materials for Gaseous Pollutant Control, Institute of Urban Environment, Chinese Academy of Sciences, Xiamen 361021, China; Key Laboratory of Urban Pollutant Conversion, Institute of Urban Environment, Chinese Academy of Sciences, Xiamen 361021, China; CAS Center for Excellence in Regional Atmospheric Environment, Institute of Urban Environment, Chinese Academy of Sciences, Xiamen 361021, China.
J Environ Sci (China). 2025 Mar;149:164-176. doi: 10.1016/j.jes.2023.10.025. Epub 2023 Oct 30.
Cerium and cobalt loaded Co-Ce/TiO catalyst prepared by impregnation method was investigated for photothermal catalytic toluene oxidation. Based on catalyst characterizations (XPS, EPR and H-TPR), redox cycle between Co and TiO (Co + Ti ↔ Co + Ti) results in the formation of Co, Ti and oxygen vacancies, which play important roles in toluene catalytic oxidation reaction. The introduction of Ce brings in the dual redox cycles (Co + Ti ↔ Co + Ti, Co + Ce ↔ Co + Ce), further promoting the elevation of reaction sites amount. Under full spectrum irradiation with light intensity of 580 mW/cm, Co-Ce/TiO catalyst achieved 96% of toluene conversion and 73% of CO yield, obviously higher than Co/P25 and Co/TiO. Co-Ce/TiO efficiently maintains 10-hour stability test under water vapor conditions and exhibits better photothermal catalytic performance than counterparts under different wavelengths illumination. Photothermal catalytic reaction displays improved activities compared with thermal catalysis, which is attributed to the promotional effect of light including photocatalysis and light activation of reactive oxygen species.
采用浸渍法制备了铈钴负载的 Co-Ce/TiO 催化剂，用于光热催化甲苯氧化反应。基于催化剂的表征（XPS、EPR 和 H-TPR），Co 和 TiO 之间的氧化还原循环（Co + Ti ↔ Co + Ti）导致 Co、Ti 和氧空位的形成，这些在甲苯催化氧化反应中起着重要作用。Ce 的引入带来了双重氧化还原循环（Co + Ti ↔ Co + Ti、Co + Ce ↔ Co + Ce），进一步促进了反应位数量的提高。在光强为 580 mW/cm 的全光谱照射下，Co-Ce/TiO 催化剂实现了 96%的甲苯转化率和 73%的 CO 产率，明显高于 Co/P25 和 Co/TiO。在水蒸气条件下，Co-Ce/TiO 能在 10 小时的稳定性测试中保持稳定，并在不同波长光照下表现出比对照物更好的光热催化性能。与热催化相比，光热催化反应显示出更高的活性，这归因于光包括光催化和活性氧物种的光活化的促进作用。
