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Influence of atomic coordination on the activity of lattice oxygen and catalytic oxidation of toluene over regular Cu2O crystalline
Journal of Hazardous Materials ( IF 12.2 ) Pub Date : 2024-12-04 , DOI: 10.1016/j.jhazmat.2024.136796
Linlin Deng, Mingtai Li, Xin Gao, Xiaokun Yi, Yang Zhao, Yulong Yang, Zitong Zhao, Jiarui Chen, Baojuan Dou, Feng Bin

VOCs oxidation over transition metal catalyst is commonly understood via the Mars-van Krevelen mechanism involving the crucial role of lattice oxygen (OL) activity, however, how it is influenced by atomic coordination is still unclear. Herein, we use model catalysts of Cu2O-cub, Cu2O-oct and Cu2O-dod with crystal planes of (100), (111) and (110), respectively, to investigate the OL activity and catalytic oxidation of toluene. The activity of Cu2O-oct is found to be the highest, followed by Cu2O-cub and Cu2O-dod. Experiments results combined with density functional theory show that, although low di-coordinated O atoms leads to the lowest surface oxygen vacancy formation energy (2.47 eV) and the highest surface OL activity of Cu2O-cub, it cannot determine the activity. The lowest bulk oxygen vacancy formation energy (3.16 eV) in Cu2O-oct terminated with tri-coordinated O atoms and open surface can accelerate the migration and replenishment of OL, thereby promoting the catalytic activity.

中文翻译:


原子配位对晶格氧活性和甲苯对常规 Cu2O 晶体催化氧化的影响



通常通过涉及晶格氧 (OL) 活性的关键作用的 Mars-van Krevelen 机制来理解过渡金属催化剂上的 VOCs 氧化,但是,它如何受到原子配位的影响仍不清楚。在此,我们使用晶面分别为 (100)、(111) 和 (110) 的 Cu2O-cub、Cu2O-oct 和 Cu2O-dod 模型催化剂来研究甲苯的 OL 活性和催化氧化。发现 Cu2O-oct 的活性最高,其次是 Cu2O-cub 和 Cu2O-dod。实验结果结合密度泛函理论表明,虽然低双配位 O 原子导致 Cu2O-cub 表面氧空位形成能最低 (2.47 eV) 和最高表面 OL 活性,但它无法确定活性。Cu2O-oct 中最低的体氧空位形成能 (3.16 eV) 以三配位 O 原子和开放表面终止,可以加速 OL 的迁移和补充,从而促进催化活性。
更新日期:2024-12-04
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