LAUSR

Abstract Ordered mesoporous TiO2-SiO2 materials with high specific area were synthesized by evaporation–induced self–assembly (EISA) method. CeNb/TiSi catalysts were prepared via impregnation method and evaluated for catalytic elimination of 1,2-dichlorobenzene (o-DCB). The structures and properties of CeNb/TiSi were controlled by adjusting Ti/Si and Ce/Nb molar ratios and characterized by N2 adsorption-desorption, XRD, TEM, Raman, XPS and temperature-programmed technology. Results showed that Ce and Nb oxides were highly dispersed on the surface of TiO2-SiO2 carriers due to its high specific surface area. Nb oxides was not only contributed to moderate and strong acid sites but also conducive to the catalytic elimination of o-DCB. Weak acid sites mainly derived from hydroxyl on the surface of Si. The catalyst without Si exhibited an optimum elimination efficacy of o-DCB but bad stability due to the deposition of Cl−, while the sample with high content of Si had excellent stability on account of the preferable chlorine-resistant ability of Si in catalytic elimination reaction o-DCB. Furthermore, the reaction mechanism of o-DCB catalytic elimination was proposed, in which surface lattice oxygen played a role of redox sites.