High activity of CeO2-TiO2 composites for deep oxidation of 1,2-dichloroethane

CeO2-TiO2 catalysts prepared by different methods were investigated for deep oxidation of 1,2-dichloroethane (DCE), as a typical representative of the chlorinated volatile organic compounds (CVOCs). Characterization analysis reveals that CeO2-TiO2 catalysts prepared by sol-gel and coprecipi-tation methods exhibit higher specific area, CeO2 and TiO2 particles are highly dispersed into each other and the reducibility and mobility of active oxygen species are obviously promoted due to the strong interaction between the two catalysts CeO2 and TiO2, resulting in higher catalytic activity for DCE oxidation to and less chlorinated byproduct. The high calcination temperature would lead to the formation of a new monoclinic phase Ce0.3Ti0.7O2 and sintering, which is the main reason for the catalytic activity for DCE oxidation markedly decreases. (C) 2020 Chinese Society of Rare Earths. Published by Elsevier B.V. All rights reserved.