| Title: | Role of Structural Defects in MnO(x) Promoted by Ag Doping in the Catalytic Combustion of Volatile Organic Compounds and Ambient Decomposition of O(3) |
| Author(s): | Deng H; Kang S; Ma J; Wang L; Zhang C; He H; |
| Address: | "Center for Excellence in Regional Atmospheric Environment, Key Laboratory of Urban Pollutant Conversion, Institute of Urban Environment , Chinese Academy of Sciences , Xiamen 361021 , China. University of Chinese Academy of Sciences , Beijing 100049 , China. State Key Joint Laboratory of Environment Simulation and Pollution Control, Research Center for Eco-Environmental Sciences , Chinese Academy of Sciences , Beijing 100085 , China" |
| ISSN/ISBN: | 1520-5851 (Electronic) 0013-936X (Linking) |
| Abstract: | "Manganese oxides are prominent candidates for the catalytic oxidation of volatile organic compounds (VOCs) or ambient decomposition of O(3) individually. Here, we compared various preparation methods to create a defect-enriched Ag-MnO(x) nanocomposite that exhibits a remarkably multifunctional activity in VOC combustion and ozone decomposition. Ag(+) ions were well-dispersed in the microtunnels of Ag-MnO(x)-H via hydrothermal replacement of the original K(+) ions; this catalyst's benzene combustion efficiency (T(90%) = 216 degrees C at a space velocity of 90 000 mL h(-1) g(-1)) was comparable to that of typical noble metal catalysts. Moreover, the decomposition of ozone over the Ag-MnO(x)-H catalyst (space velocity = 840 000 mL h(-1) g(-1)) under a relative humidity of 60% was above 90%, indicating that it is a promising material for ozone elimination in practical application. The local structure results indicated that silver incorporation via the hydrothermal method facilitates the formation of nonstoichiometric defects in the MnO(x) matrix. The large number of active oxygen species related to O vacancies appeared to play critical roles in VOC combustion; moreover, the oxygen vacancies originating from O defects were also critical in O(3) abatement. This work provides multifunctional catalysts for VOC combustion and ambient O(3) decomposition and may assist with the rational design of MnO(x) catalysts for application in various conditions" |
| Keywords: | Catalysis Manganese Compounds Oxidation-Reduction Oxides *Ozone Silver *Volatile Organic Compounds; |
| Notes: | "MedlineDeng, Hua Kang, Shunyu Ma, Jinzhu Wang, Lian Zhang, Changbin He, Hong eng 2019/08/16 Environ Sci Technol. 2019 Sep 17; 53(18):10871-10879. doi: 10.1021/acs.est.9b01822. Epub 2019 Aug 30" |
