Chen Cheng, Wu Mingge, Ma Chunyan, Song Maoyong, Jiang Guibin
Key Laboratory of Environmental Nanotechnology and Health Effects, Research Center for Eco-Environmental Sciences, Chinese Academy of Sciences, Beijing 100085, China.
University of Chinese Academy of Sciences, Beijing 100049, China.
ACS Omega. 2023 May 30;8(23):21026-21031. doi: 10.1021/acsomega.3c01887. eCollection 2023 Jun 13.
Selective oxidation of toluene is a key reaction to produce high value-added products but remains a big challenge. In this study, we introduce a nitrogen-doped TiO (N-TiO) catalyst to create more Ti and oxygen vacancy (O), which act as active sites for selective oxidation of toluene via activating O to superoxide radical (•O). Interestingly, the resulting N-TiO-2 exhibited an outstanding photo-assisted thermal performance with a product yield of 209.6 mmol·g and a toluene conversion of 10960.0 μmol·g·h, which are 1.6 and 1.8 times greater than those obtained under thermal catalysis. We showed that the enhanced performance under photo-assisted thermal catalysis was attributed to more active species generation by making full use of photogenerated carriers. Our work suggests a viewpoint to apply a noble-metal-free TiO system in the selective oxidation of toluene under solvent-free conditions.
甲苯的选择性氧化是生产高附加值产品的关键反应，但仍然是一个巨大的挑战。在本研究中，我们引入了一种氮掺杂的TiO（N-TiO）催化剂，以产生更多的Ti和氧空位（O），它们作为通过将O活化成超氧自由基（•O）来进行甲苯选择性氧化的活性位点。有趣的是，所得的N-TiO-2表现出出色的光辅助热性能，产物产率为209.6 mmol·g，甲苯转化率为10960.0 μmol·g·h，分别比热催化下获得的值高1.6倍和1.8倍。我们表明，光辅助热催化下性能的增强归因于通过充分利用光生载流子产生了更多的活性物种。我们的工作提出了一种在无溶剂条件下将无贵金属的TiO体系应用于甲苯选择性氧化的观点。
