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Efficient monolithic MnOx catalyst prepared by heat treatment for ozone decomposition.

Authors :
Qiu, Jing
Wang, Wei
Wang, Jianli
Zhao, Ming
Chen, Yaoqiang
Source :
Environmental Science & Pollution Research; Jun2022, Vol. 29 Issue 29, p44324-44334, 11p
Publication Year :
2022

Abstract

The effects of calcined temperature on the properties and ozone decomposition activity of manganese oxide catalysts were investigated under high-humidity, low ozone conditions. An outstanding manganese-based catalyst (MnO<subscript>x</subscript> (260 ℃)) was prepared, which could decompose above 90% (RH = 0%) and 70% (RH = 90%) ozone after 6 h using. Specific characterization showed MnO<subscript>x</subscript> (260 ℃) had excellent properties. XRD results showed MnO<subscript>x</subscript> (260 ℃) was mainly Mn<subscript>3</subscript>O<subscript>4</subscript> and partially MnO<subscript>2</subscript>. TEM indicated MnO<subscript>x</subscript> (260 ℃) exposed highly active crystal family plan MnO<subscript>2</subscript> (110), and the lattice fringes of MnO<subscript>2</subscript> (110) and Mn<subscript>3</subscript>O<subscript>4</subscript> (103) overlapped. In situ DRIFT showed hydroxyl groups adsorbed on MnO<subscript>x</subscript> (260 ℃) were removed, which is beneficial to inhibiting the inactivation caused by surface water accumulation. O<subscript>2</subscript>-TPD results proven MnO<subscript>x</subscript> (260 ℃) had good oxygen migration ability. XPS results manifested that MnO<subscript>x</subscript> (260 ℃) had the most adsorbed oxygen. In short, when the calcination temperature is appropriate, MnO<subscript>x</subscript> (260 ℃) has coexisted multiple phases, exposed high active crystal family plan and removed surface hydroxyl, which is conducive to the exposure of oxygen vacancies and the inhibition of deactivation. [ABSTRACT FROM AUTHOR]

Details

Language :
English
ISSN :
09441344
Volume :
29
Issue :
29
Database :
Complementary Index
Journal :
Environmental Science & Pollution Research
Publication Type :
Academic Journal
Accession number :
157462545
Full Text :
https://doi.org/10.1007/s11356-021-18261-0