Catalytic stability enhancement for pollutant removal via balancing lattice oxygen mobility and VOCs adsorption

Yuan Feng; Chongchen Wang; Can Wang; Haibao Huang; Hsing-Cheng Hsi; Erhong Duan; Yuxi Liu; Guangsheng Guo; Hongxing Dai; Jiguang Deng

doi:10.1016/j.jhazmat.2021.127337

Catalytic stability enhancement for pollutant removal via balancing lattice oxygen mobility and VOCs adsorption

J Hazard Mater. 2022 Feb 15;424(Pt A):127337. doi: 10.1016/j.jhazmat.2021.127337. Epub 2021 Sep 25.

Authors

Yuan Feng¹, Chongchen Wang², Can Wang³, Haibao Huang⁴, Hsing-Cheng Hsi⁵, Erhong Duan⁶, Yuxi Liu¹, Guangsheng Guo¹, Hongxing Dai¹, Jiguang Deng⁷

Affiliations

¹ Key Laboratory of Beijing on Regional Air Pollution Control, Beijing Key Laboratory for Green Catalysis and Separation, Center of Excellence for Environmental Safety and Biological Effects, Beijing University of Technology, Beijing 100124, China.
² Beijing Key Laboratory of Functional Materials for Building Structure and Environment Remediation, Beijing University of Civil Engineering and Architecture, Beijing 100044, China.
³ School of Environmental Science and Engineering, Tianjin University, Tianjin 300350, China.
⁴ School of Environmental Science and Engineering, Sun Yat-Sen University, Guangzhou 510275, China.
⁵ Graduate Institute of Environmental Engineering, National Taiwan University, Taipei 10617, Taiwan, ROC.
⁶ School of Environmental Science and Engineering, Hebei University of Science and Technology, 26th Yuxiang Street, Shijiazhuang, Hebei 050018, China.
⁷ Key Laboratory of Beijing on Regional Air Pollution Control, Beijing Key Laboratory for Green Catalysis and Separation, Center of Excellence for Environmental Safety and Biological Effects, Beijing University of Technology, Beijing 100124, China. Electronic address: jgdeng@bjut.edu.cn.

PMID: 34600382
DOI: 10.1016/j.jhazmat.2021.127337

Abstract

Manganese oxide supported Pt single atoms (Pt₁/MnO_x) are prepared by the molten salt method. Catalytic oxidation of toluene and iso-hexane, typical emissions from furniture paints industry, is tested. Pt₁/MnO_x shows poor and high catalytic stability for toluene and iso-hexane oxidation, respectively. Enhancement in the catalytic stability for toluene oxidation is observed after the hydrogen reduction treatment of Pt₁/MnO_x at 200 °C. The hydrogen treated catalyst possesses the weaker Mn-O bonds and lower coordination number of PtO, with superior mobility of lattice oxygen and appropriate toluene adsorption. Balancing lattice oxygen mobility and volatile organic compounds adsorption is important for the catalytic stability of Pt₁/MnO_x. For the oxidation of toluene and iso-hexane mixture, owing to the competitive adsorption, iso-hexane oxidation is greatly inhibited, while toluene oxidation is not influenced. The present Pt₁/MnO_x catalyst holds promising prospect in furniture paints industry applications because of high catalytic stability and water resistance ability.

Keywords: Catalytic stability; Lattice oxygen mobility; Single atom catalyst; VOCs adsorption; VOCs removal.