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Title:		Investigation into the Phase-Activity Relationship of MnO(2) Nanomaterials toward Ozone-Assisted Catalytic Oxidation of Toluene
Author(s):		Yang R; Guo Z; Cai L; Zhu R; Fan Y; Zhang Y; Han P; Zhang W; Zhu X; Zhao Q; Zhu Z; Chan CK; Zeng Z;
Address:		"State Key Lab of Urban Water Resource and Environment, School of Civil and Environmental Engineering, Harbin Institute of Technology Shenzhen, Shenzhen, 518055, P. R. China. Department of Materials Science and Engineering, City University of Hong Kong, 83 Tat Chee Avenue, Kowloon, Hong Kong, 999077, P. R. China. Shenzhen Key Laboratory of Organic Pollution Prevention and Control, Harbin Institute of Technology (Shenzhen), Shenzhen, 518055, P. R. China. School of Energy and Environment, City University of Hong Kong, 83 Tat Chee Avenue, Kowloon, Hong Kong, 999077, P. R. China"
Journal Title:		Small
Year:		2021
Volume:		20211031
Issue:		50
Page Number:		e2103052 -
DOI:		10.1002/smll.202103052
ISSN/ISBN:		1613-6829 (Electronic) 1613-6810 (Linking)
Abstract:		"Manganese dioxide (MnO(2) ), with naturally abundant crystal phases, is one of the most active candidates for toluene degradation. However, it remains ambiguous and controversial of the phase-activity relationship and the origin of the catalytic activity of these multiphase MnO(2) . In this study, six types of MnO(2) with crystal phases corresponding to alpha-, beta-, gamma-, epsilon-, lambda-, and delta-MnO(2) are prepared, and their catalytic activity toward ozone-assisted catalytic oxidation of toluene at room temperature are studied, which follow the order of delta-MnO(2) > alpha-MnO(2) > epsilon-MnO(2) > gamma-MnO(2) > lambda-MnO(2) > beta-MnO(2) . Further investigation of the specific oxygen species with the toluene oxidation activity indicates that high catalytic activity of MnO(2) is originated from the rich oxygen vacancy and the strong mobility of oxygen species. This work illustrates the important role of crystal phase in determining the oxygen vacancies' density and the mobility of oxygen species, thus influencing the catalytic activity of MnO(2) catalysts, which sheds light on strategies of rational design and synthesis of multiphase MnO(2) catalysts for volatile organic pollutants' (VOCs) degradation"
Keywords:		Catalysis Manganese Compounds *Nanostructures Oxides *Ozone Toluene MnO 2 catalytic oxidation crystal phase ozone;
Notes:		"MedlineYang, Ruijie Guo, Zhongjie Cai, Lixin Zhu, Rongshu Fan, Yingying Zhang, Yuefeng Han, Pingping Zhang, Wanjian Zhu, Xiangang Zhao, Qitong Zhu, Zhenye Chan, Chak Keung Zeng, Zhiyuan eng CityU9610435/Start-Up Grant from CityU/ CityU9048163/ECS scheme/ No. 20200730115110013/University Stability Support Program in Shenzhen/ No. 20201216072628001/Shenzhen Science and Technology Innovation Commission for Sustainable Development Science and Technology/ Nos. 20180430170126680/Fund for Knowledge Innovation in Shenzhen/ JSGG20201103092401005/Fund for Knowledge Innovation in Shenzhen/ No. 2020KZDZX1219/Guangdong Province's Research Projects for Prevention and Control of COVID-19/ Research Support, Non-U.S. Gov't Germany 2021/11/02 Small. 2021 Dec; 17(50):e2103052. doi: 10.1002/smll.202103052. Epub 2021 Oct 31"