Eye-Readable Detection and Oxidation of CO with a Platinum-Based Catalyst and a Binuclear Rhodium Complex
Jiafu Qu1, Yueqiang Cao2, Xuezhi Duan2, Najun Li1, Qingfeng Xu1, Hua Li1, Jinghui He1, Dongyun Chen1,*（陈冬赟）, and Jianmei Lu1,*（路建美）
1 College of Chemistry, Chemical Engineering and Materials Science Collaborative Innovation Center of Suzhou Nano Science and Technology, Soochow University Suzhou 215123 (P. R. China)
2 State Key Laboratory of Chemical Engineering East China University of Science and Technology Shanghai 200237 (China)
Angew. Chem. Int. Ed. 2019, 58, 12258--12263
Toxic gases that are colorless and odorless, such as CO, are a major environmental concern and require early detection to prevent serious toxicological effects. In this study, a unique system (Pt/HMSs-BRC) was fabricated by combining a catalyst (Pt/hollow mesoporous silica spheres, Pt/HMSs) with a silica gel containing an adsorbed chromogenic probe (binuclear rhodium complex, BRC). The process is a simple method to prepare well-dispersed and uniform Pt nanoparticles. The Pt/HMSs-BRC materials demonstrated early CO detection and excellent catalytic performance for CO oxidation. The probe exhibited remarkable color modulation from gray-violet to light-yellow when exposed to CO concentration levels above 50 ppm, and the color of the chromogenic probe was fully recoverable. By a kinetics-assisted discrimination method and DFT calculations, it was found that the corner Pt sites are the dominant active sites for CO oxidation.