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Effect of Ni–V loading on the performance of hollow anatase TiO2 in the catalytic combustion of dichloromethane

Author:
Zhou, Bing, Zhang, Xixiong, Wang, Yong, Xie, Jing, Xi, Kang, Zhou, Ying, Lu, Hanfeng
Source:
Journal of environmental sciences (China) 2019 v.84 pp. 59-68
ISSN:
1001-0742
Subject:
Fourier transform infrared spectroscopy, X-ray diffraction, byproducts, catalysts, catalytic activity, chlorine, combustion, energy-dispersive X-ray analysis, hydrogen, methylene chloride, nickel, sol-gel processing, thermogravimetry, titanium dioxide, transmission electron microscopy, vanadium
Abstract:
A catalyst based on mixed V-Ni oxides supported on TiO2 (Ni–V/TiO2) was obtained using the sol–gel method. Its catalytic performance relative to dichloromethane (DCM) degradation was investigated. Characterization and analysis were conducted using transmission electron microscopy, H2 temperature-programmed reduction, pyridine–Fourier transform infrared spectroscopy (FTIR) characterization, and X-ray diffraction. Results showed that the original hollow anatase structure of pure TiO2 was well-maintained after Ni–V loading. The loading of NiO–VOx not only significantly improved the stability of pure TiO2 but also inhibited the formation of the by-product monochloromethane (MCM). Among the series of Ni–V/TiO2 catalysts, 4%Ni–V/TiO2 possessed the highest catalytic activity, with 90% DCM conversion at only 203°C. No by-products and no significant changes in the catalytic activity were observed during combustion of DCM after 100 hr of a continuous stability test. Furthermore, thermogravimetric analysis (O2-TG) and energy dispersive spectrometer (EDS) characterization of the used 4%Ni–V/TiO2 catalyst revealed that no coke deposition or chlorine species could be detected on the catalyst surface.
Agid:
6380717