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Environ Sci Pollut Res Int

Title:		Catalytic oxidation of trichloroethylene from gas streams by perovskite-type catalysts
Author(s):		He CB; Pan KL; Chang MB;
Address:		"Graduate Institute of Environmental Engineering, National Central University, No.300, Jhongda Road, Jhongli District, Taoyuan City, 32001, Taiwan. Graduate Institute of Environmental Engineering, National Central University, No.300, Jhongda Road, Jhongli District, Taoyuan City, 32001, Taiwan. mbchang@ncuen.ncu.edu.tw"
Journal Title:		Environ Sci Pollut Res Int
Year:		2018
Volume:		20180210
Issue:		12
Page Number:		11584 - 11594
DOI:		10.1007/s11356-018-1440-5
ISSN/ISBN:		1614-7499 (Electronic) 0944-1344 (Linking)
Abstract:		"Three perovskite-type catalysts including LaMnO(3), La(0.8)Ce(0.2)MnO(3), and La(0.8)Ce(0.2) Mn(0.8)Ni(0.2)O(3) are prepared using citric acid sol-gel method and evaluated as catalyst for the oxidation of trichloroethylene (TCE) in air with temperature ranging from 100 to 600 degrees C. The physicochemical properties of three perovskite-type catalysts were characterized by SEM, EDS, XRD, BET, and XPS to investigate the relationship with catalytic activities. The results show that the removal efficiency of TCE achieved with La(0.8)Ce(0.2)Mn(0.8)Ni(0.2)O(3) (the best one) reaches 100% at 400 degrees C and the mineralization efficiency reaches 100% at 600 degrees C. The enhanced activity can be attributed to the addition of Ce and Ni which increases the surface areas, active oxygen species, and the redox ability of the Mn(4+)/Mn(3+) ratio on the catalyst surface. As La(0.8)Ce(0.2)Mn(0.8)Ni(0.2)O(3) is applied for TCE oxidation, the main intermediate chlorinated byproduct detected is tetrachloroethylene (C(2)Cl(4)) which is generated by the reaction of TCE and chlorine (Cl(2)). The activation energy for the TCE oxidation with La(0.8)Ce(0.2)Mn(0.8)Ni(0.2)O(3) catalyst is 51 kJ/mol using kinetic models of power-law type"
Keywords:		Air Pollutants/*analysis/chemistry Calcium Compounds/*chemistry Catalysis Gases/chemistry Hot Temperature Oxidation-Reduction Oxides/*chemistry Surface Properties Titanium/*chemistry Trichloroethylene/*analysis/chemistry Volatile Organic Compounds/*analys;
Notes:		"MedlineHe, Cheng Bin Pan, Kuan Lun Chang, Moo Been eng MOST102-2221-E-008-003-MY3/Ministry of Science and Technology, Taiwan/ 10221046/National Central University/ Germany 2018/02/13 Environ Sci Pollut Res Int. 2018 Apr; 25(12):11584-11594. doi: 10.1007/s11356-018-1440-5. Epub 2018 Feb 10"