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. 2022 Jun;29(29):44324-44334.
doi: 10.1007/s11356-021-18261-0. Epub 2022 Feb 7.

Efficient monolithic MnOx catalyst prepared by heat treatment for ozone decomposition

Jing Qiu  1 , Wei Wang  1 , Jianli Wang  2 , Ming Zhao  3 , Yaoqiang Chen  1   4
Affiliations

Efficient monolithic MnOx catalyst prepared by heat treatment for ozone decomposition

Jing Qiu et al. Environ Sci Pollut Res Int. 2022 Jun.

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 (MnOx (260 ℃)) was prepared, which could decompose above 90% (RH = 0%) and 70% (RH = 90%) ozone after 6 h using. Specific characterization showed MnOx (260 ℃) had excellent properties. XRD results showed MnOx (260 ℃) was mainly Mn3O4 and partially MnO2. TEM indicated MnOx (260 ℃) exposed highly active crystal family plan MnO2 (110), and the lattice fringes of MnO2 (110) and Mn3O4 (103) overlapped. In situ DRIFT showed hydroxyl groups adsorbed on MnOx (260 ℃) were removed, which is beneficial to inhibiting the inactivation caused by surface water accumulation. O2-TPD results proven MnOx (260 ℃) had good oxygen migration ability. XPS results manifested that MnOx (260 ℃) had the most adsorbed oxygen. In short, when the calcination temperature is appropriate, MnOx (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.

Keywords: Calcination temperature; Catalyst; Manganese oxide; Oxygen vacancy; Ozone decomposition; Surface properties.

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