He Darong, Li Yan, Liu Yaxin, Chen Yunfeng, Zhao Ming, Wang Jianli, Chen Yaoqiang
Key Laboratory of Green Chemistry and Technology, Ministry of Education, College of Chemistry, Sichuan University, Chengdu 610064, Sichuan, China.
Key Laboratory of Green Chemistry and Technology, Ministry of Education, College of Chemistry, Sichuan University, Chengdu 610064, Sichuan, China; Center of Engineering of Vehicular Exhaust Gases Abatement, Chengdu 610064, Sichuan, China; Center of Engineering of Environmental Catalytic Material, Chengdu 610064, Sichuan, China.
J Colloid Interface Sci. 2025 Jan 15;678(Pt C):1064-1076. doi: 10.1016/j.jcis.2024.09.169. Epub 2024 Sep 19.
Nitric oxide (NO) oxidation is an integral part of the nitrogen chemical cycle, but competitive activation of NO/O over single platinum (Pt)-based catalysts result in inadequate low temperature performance. Here, we constructed catalysts with BiMnO/CeO and Pt/BiMnO defective interfaces (sufficient activation of NO/O). The constructed catalyst achieved 95 % NO conversion at 260 °C in NO/O atmosphere, superior to most known catalysts. Even after aging (800 °C for 16 h), the NO conversion was up to 76 %. Further, the catalyst can be applied to actual diesel exhaust. Detailed oxygen vacancies (O) characterization reveals that BiMnO/CeO defective interface created by Ce-O + Mn-O ↔ Ce-O + Mn-O promote the activation of NO (on Mn sites) and O (on Mn-O sites). Besides, the O on Pt/BiMnO defective interface compensate for the loss of Pt sites ensuring hydrothermal stability. And this construction of multiple defective interfaces develops a pathway for boosting catalytic reactions.
