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Oxygen Vacancies Induced by Transition Metal Doping in gamma-MnO2 for Highly Efficient Ozone Decomposition
Li, Xiaotong; Ma, Jinzhu; Yang, Li; He, Guangzhi; Zhang, Changbin; Zhang, Runduo; He, Hong
2018-11-06
Source PublicationENVIRONMENTAL SCIENCE & TECHNOLOGY
ISSN0013-936X
Volume52Issue:21Pages:12685-12696
AbstractTransition metal (cerium and cobalt) doped gamma MnO2 (M-gamma-MnO2, where M represents Ce, Co) catalysts were successfully synthesized and characterized. Cerium-doped gamma-MnO2 materials showed ozone (O-3) conversion of 96% for 40 ppm of O-3 under relative humidity (RH) of 65% and space velocity of 840 L (g)-1 h(-1) after 6 h at room temperature, which is far superior to the performance of the Co-gamma-MnO2 (55%) and gamma-MnO2 (38%) catalysts. Under space velocity of 840 L g(-1) h(-1) the conversion of ozone over the Ce-gamma-MnO2 catalyst under RH = 65% and dry conditions within 96 h was 60% and 100%, respectively, indicating that it is a promising material for ozone decomposition. XRD and HRTEM data suggested that Ce-gamma-MnO2 formed mixed crystals consisting of alpha-MnO2 and gamma-MnO2 with specific surface area increased from 74 m(2)/g to 120 m(2)/g compared to undoped gamma-MnO2, thus more surface defects were introduced. H-2-TPR, O-2-TPD, XPS, Raman, and EXAFS confirmed that Ce- gamma-MnO2 exhibited more surface oxygen vacancies and surface defects, which play a key role during the decomposition of ozone. This study provides important insights for developing improved catalysts for gaseous ozone decomposition and promoting the performance of manganese oxide for practical ozone elimination.
Department大气污染控制中心
Document Type期刊论文
Identifierhttp://ir.rcees.ac.cn/handle/311016/40825
Collection大气环境与污染控制实验室
Recommended Citation
GB/T 7714
Li, Xiaotong,Ma, Jinzhu,Yang, Li,et al. Oxygen Vacancies Induced by Transition Metal Doping in gamma-MnO2 for Highly Efficient Ozone Decomposition[J]. ENVIRONMENTAL SCIENCE & TECHNOLOGY,2018,52(21):12685-12696.
APA Li, Xiaotong.,Ma, Jinzhu.,Yang, Li.,He, Guangzhi.,Zhang, Changbin.,...&He, Hong.(2018).Oxygen Vacancies Induced by Transition Metal Doping in gamma-MnO2 for Highly Efficient Ozone Decomposition.ENVIRONMENTAL SCIENCE & TECHNOLOGY,52(21),12685-12696.
MLA Li, Xiaotong,et al."Oxygen Vacancies Induced by Transition Metal Doping in gamma-MnO2 for Highly Efficient Ozone Decomposition".ENVIRONMENTAL SCIENCE & TECHNOLOGY 52.21(2018):12685-12696.
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