A confinement strategy for constructing CexMn1−xO2 solid solutions with oxygen vacancies confined in interwoven titania nanotubes toward catalytic ozonation of 1, 2-dichloroethane. Issue 2 (April 2023)

• Record Type: Journal Article
• Authors: Zhang, Xirong; Xu, Zhongjun; Jiang, Mengyun; Liu, Ying; Han, Zizhen
• Is Part Of: Journal of environmental chemical engineering. Volume 11:Issue 2(2023)
• Publication Date: 2023-04
• Subjects: Dual-site composite -- Oxygen vacancy -- Catalytic ozonation -- 1, 2-Dichloroethane -- Theoretical calculation; Chemical engineering -- Environmental aspects -- Periodicals; Environmental engineering -- Periodicals; Chemical engineering -- Environmental aspects; Environmental engineering; Periodicals; 660.0286
• DOI: 10.1016/j.jece.2023.109299
• Languages: English
• ISSNs: 2213-2929

Abstract

Abstract: Catalytic ozonation is an effective method to control chlorinated volatile organic compounds (CVOCs) emissions in industrial plants. Here, a series of Cex Mn1−x O2 mixed oxides with different atomic ratios confined on tubular titanium nanotubes (TNTs) were prepared and evaluated for catalytic ozonation of CVOCs, employing 1, 2-dichloroethane (DCE) as the model molecule. For dual-site Cex Mn1−x O2 /TNTs catalysts, Ce doping on MnO2 /TNTs triggered the formation of surface lattice defects, resulting in an increase in the density of oxygen vacancies but a decrease in strong-acidity sites. The Ce0.3 Mn0.7 O2 /TNTs catalyst obtained DCE removal efficiency of 96.7% with CO2 selectivity of 86.0% during 18 h, and performed good reproducibility of 4 cycles and moderate water vapor resistance at room temperature. The catalytic activity of Cex Mn1−x O2 /TNTs catalysts was influenced significantly by the acidity content and the oxygen vacancies concentration. Based on six types of by-products and Fukui index analysis, three conceivable reaction pathways of DCE decomposition were proposed. This work deepens the understanding of dual-site catalysts to catalytic ozonation of CVOCs and develops a new platform for hazardous-air treatment. Graphical Abstract: ga1 Highlights: A series of Cex Mn1−x O2 hosts encapsulated in titanium nanotubes are produced. DCE enriches in TNTs and oxygen vacancies benefit the O3 capture and activation. C-Cl and C-C bonds are easily attacked by·OH, ·O2 - and 1 O2, respectively.