Main content area

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

Zhou, Bing, Zhang, Xixiong, Wang, Yong, Xie, Jing, Xi, Kang, Zhou, Ying, Lu, Hanfeng
Journal of environmental sciences (China) 2019 v.84 pp. 59-68
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
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.