Efficient ozone decomposition over nickel-modified amorphous MnOx catalysts

Zhang, Qiuyan; Wang, Aijie; Wu, Yu; Han, Chong

doi:10.1007/s10098-023-02725-7

Efficient ozone decomposition over nickel-modified amorphous MnO_x catalysts

Original Paper
Published: 04 February 2024

(2024)
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Clean Technologies and Environmental Policy Aims and scope Submit manuscript

Qiuyan Zhang¹,
Aijie Wang¹,
Yu Wu¹ &
…
Chong Han¹

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Abstract

Manganese oxides (MnO_x) with crystal structures are difficult to effectively remove ozone under high humidity owing to their low defect content and poor moisture resistance. Herein, Ni_a-MnO_x-A catalysts with different defect degrees were well fabricated by modulating the ratios of the precursors via a facile hydrothermal approach. Effects of molar ratios of precursors on physiochemical properties and ozone removal efficiencies of Ni_a-MnO_x-A were investigated systematically under high humidity conditions. Amorphous Ni_0.5-MnO_x-1.5 exhibited an ozone conversion of 100% for a continuous air flow containing 20 ppm ozone at a relative humidity (RH) of 60% (space velocity = 600 L·g⁻¹·h⁻¹). The incorporation of Ni²⁺ ions weakened the crystallinity and facilitated oxygen vacancy defect formation, which are believed to be active sites for ozone decomposition. It was confirmed that the exceptional ozone decomposition capacity of Ni_0.5-MnO_x-1.5 was attributed to its abundant oxygen vacancy, larger specific surface area, and higher reducibility and oxygen mobility. Furthermore, sufficient oxygen vacancy effectively mitigated the negative effect of humidity.

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Data will be made available on request.

Abbreviations

NO_x :: Nitrogen oxides
VOCs:: Volatile organic compounds
OACD:: Ozone-generating air cleaning devices
MnO_x :: Manganese oxides
BET:: Brunauer–Emmett–Teller
XPS:: X-ray photoelectron spectroscopy
XRD:: X-ray diffractometer
SEM:: Scanning electron microscope
H₂-TPR:: Hydrogen temperature-programmed reduction
O₂-TPD:: Oxygen temperature-programmed desorption
In situ DRIFTS:: In situ Diffuse Reflectance Infrared Fourier Transform spectroscopy
EDS:: Energy dispersive X-ray detector
BJH:: Barrett–Joyner–Halenda
ICP-OES:: Inductively coupled plasma-optical emission spectroscopy
EPR:: Electron paramagnetic resonance
WHSV:: Weight hourly space velocity
S_BET :: Specific surface areas
D_pore :: Average pore diameter
AOS:: Surface average oxidation state

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Funding

This work was supported by the National Natural Science Foundation of China [Grant number 42077198], the LiaoNing Revitalization Talents Program [Grant number XLYC1907185], and the Fundamental Research Funds for the Central Universities [Grant numbers N2325034; N2325002].

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School of Metallurgy, Northeastern University, Shenyang, 110819, China
Qiuyan Zhang, Aijie Wang, Yu Wu & Chong Han

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Qiuyan Zhang
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Yu Wu
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Chong Han
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All the authors contributed to the study conception and design. Material preparation, data collection and analysis, and the first draft of the manuscript were written by QZ. Data analysis was performed by AW and YW. Experimental scheme formulation, data analysis, and manuscript editing were performed by CH. Funding acquisition and supervision were performed by CH. All the authors read and approved the final manuscript.

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Zhang, Q., Wang, A., Wu, Y. et al. Efficient ozone decomposition over nickel-modified amorphous MnO_x catalysts. Clean Techn Environ Policy (2024). https://doi.org/10.1007/s10098-023-02725-7

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