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Detrimental role of residual surface acid ions on ozone decomposition over Ce-modified gamma-MnO2 under humid conditions
Li, Xiaotong; Ma, Jinzhu; Zhang, Changbin; Zhang, Runduo; He, Hong
2020-05
Source PublicationJOURNAL OF ENVIRONMENTAL SCIENCES
ISSN1001-0742
Volume91Pages:43-53
AbstractIn the study, the catalyst precursors of Ce-modified gamma-MnO2 were washed with deionized water until the pH value of the supernatant was 1, 2, 4 and 7, and the obtained catalysts were named accordingly. Under space velocity of 300,000 hr(-1), the ozone conversion over the pH = 7 catalyst under dry conditions and relative humidity of 65% over a period of 6 hr was 100% and 96%, respectively. However, the ozone decomposition activity of the pH = 2 and 4 catalysts distinctly decreased under relative humidity of 65% compared to that under dry conditions. Detailed physical and chemical characterization demonstrated that the residual sulfate ions on the pH = 2 and 4 catalysts decreased their hydrophobicity and then restrained humid ozone decomposition activity. The pH = 2 and 4 catalysts had inferior resistance to high space velocity under dry conditions, because the residual sulfate ion on their surface reduced their adsorption capacity for ozone molecules and increased their apparent activation energies, which was proved by temperature programmed desorption of O-2 and kinetic experiments. Long-term activity testing, X-ray photoelectron spectroscopy and density functional theory calculations revealed that there were two kinds of oxygen vacancies on the manganese dioxide catalysts, one of which more easily adsorbed oxygen species and then became deactivated. This study revealed the detrimental effect of surface acid ions on the activity of catalysts under humid and dry atmospheres, and provided guidance for the development of highly efficient catalysts for ozone decomposition. (C) 2020 The Research Center for Eco-Environmental Sciences, Chinese Academy of Sciences. Published by Elsevier B.V.
Department大气环境与污染控制实验室
KeywordOzone decomposition Manganese dioxide Surface acid ions Moisture-resistant property Oxygen vacancy
Document Type期刊论文
Identifierhttp://ir.rcees.ac.cn/handle/311016/45070
Collection大气环境与污染控制实验室
Recommended Citation
GB/T 7714
Li, Xiaotong,Ma, Jinzhu,Zhang, Changbin,et al. Detrimental role of residual surface acid ions on ozone decomposition over Ce-modified gamma-MnO2 under humid conditions[J]. JOURNAL OF ENVIRONMENTAL SCIENCES,2020,91:43-53.
APA Li, Xiaotong,Ma, Jinzhu,Zhang, Changbin,Zhang, Runduo,&He, Hong.(2020).Detrimental role of residual surface acid ions on ozone decomposition over Ce-modified gamma-MnO2 under humid conditions.JOURNAL OF ENVIRONMENTAL SCIENCES,91,43-53.
MLA Li, Xiaotong,et al."Detrimental role of residual surface acid ions on ozone decomposition over Ce-modified gamma-MnO2 under humid conditions".JOURNAL OF ENVIRONMENTAL SCIENCES 91(2020):43-53.
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