Unveiling the role of oxygen vacancy of manganese oxide coating on Ni foam to magnetocaloric catalytic oxidation of toluene

Shuangyong Su; Chunqi Wang; Hangyu Duan; Xuelong Lv; Jin Chen; Hongpeng Jia

doi:10.1016/j.jhazmat.2024.136279

Unveiling the role of oxygen vacancy of manganese oxide coating on Ni foam to magnetocaloric catalytic oxidation of toluene

J Hazard Mater. 2024 Dec 5:480:136279. doi: 10.1016/j.jhazmat.2024.136279. Epub 2024 Oct 24.

Authors

Shuangyong Su¹, Chunqi Wang¹, Hangyu Duan¹, Xuelong Lv², Jin Chen³, Hongpeng Jia⁴

Affiliations

¹ Xiamen Key Laboratory of Materials for Gaseous Pollutant Control, Institute of Urban Environment, Chinese Academy of Sciences, Xiamen 361021, China; Key Laboratory of Urban Pollutant Conversion, Institute of Urban Environment, Chinese Academy of Sciences, Xiamen 361021, China; CAS Center for Excellence in Regional Atmospheric Environment, Institute of Urban Environment, Chinese Academy of Sciences, Xiamen 361021, China; College of Resources and Environment, Fujian Agriculture and Forestry University, Fuzhou 350002, China.
² Xiamen Key Laboratory of Materials for Gaseous Pollutant Control, Institute of Urban Environment, Chinese Academy of Sciences, Xiamen 361021, China; Key Laboratory of Urban Pollutant Conversion, Institute of Urban Environment, Chinese Academy of Sciences, Xiamen 361021, China; CAS Center for Excellence in Regional Atmospheric Environment, Institute of Urban Environment, Chinese Academy of Sciences, Xiamen 361021, China; University of Chinese Academy of Sciences, Beijing 100049, China.
³ Xiamen Key Laboratory of Materials for Gaseous Pollutant Control, Institute of Urban Environment, Chinese Academy of Sciences, Xiamen 361021, China; Key Laboratory of Urban Pollutant Conversion, Institute of Urban Environment, Chinese Academy of Sciences, Xiamen 361021, China; CAS Center for Excellence in Regional Atmospheric Environment, Institute of Urban Environment, Chinese Academy of Sciences, Xiamen 361021, China; University of Chinese Academy of Sciences, Beijing 100049, China. Electronic address: [email protected].
⁴ Xiamen Key Laboratory of Materials for Gaseous Pollutant Control, Institute of Urban Environment, Chinese Academy of Sciences, Xiamen 361021, China; Key Laboratory of Urban Pollutant Conversion, Institute of Urban Environment, Chinese Academy of Sciences, Xiamen 361021, China; CAS Center for Excellence in Regional Atmospheric Environment, Institute of Urban Environment, Chinese Academy of Sciences, Xiamen 361021, China; University of Chinese Academy of Sciences, Beijing 100049, China. Electronic address: [email protected].

PMID: 39471610
DOI: 10.1016/j.jhazmat.2024.136279

Abstract

Using a pulsed-voltage technique, the manganese oxide (MnO_x) coating on Ni foam (NF) was regulated to encourage magnetocaloric oxidation, which lowers volatile organic compounds (VOCs). The MnO_x/NF was obtained by electrodeposition of MnO_x onto NF. Subsequently, MnO_x/NF-PV was obtained by pulsed-voltage modification. According to the structural characterization, the pulsed-voltage modification changed the interaction between the coating and the support, resulting in increased toluene adsorption capacity, oxygen desorption capability, oxygen vacancy (O_V) quantity of MnO_x/NF-PV. The MnO_x/NF-PV exhibits excellent catalytic performance, with a 90 % conversion of toluene at 170 °C, where O_V play an important role as electronic intermediates in magnetocaloric oxidation reactions. Furthermore, compared to traditional thermal catalysis, electromagnetic induction heating (EMIH) can promote the reactivity of O_V in magnetocaloric catalysts by increasing the activation and dissociation of oxygen species and thus catalytic activity, which was demonstrated in the ¹⁸O isotope exchange experiment.

Keywords: Catalytic oxidation; Electromagnetic induction heating; Manganese oxide; Oxygen vacancy; Volatile organic compounds.