Surface phenomenon of CeO2-added V2O5/TiO2 catalyst based chemical vapor condensation (CVC) for enhanced selective catalytic reduction at low temperatures

Abstract

In this study, our purpose was to investigate and research in depth the different physico-chemical properties and the surface phenomenon mechanism of the CeO2-added V2O5/TiO2 catalyst prepared via the chemical vapor condensation (CVC) and impregnation method for enhanced NH3-selective catalytic reduction activity. In addition, we performed surface analyses of the materials using various techniques,,such as X-ray photoelectron spectroscopy, X-ray diffraction, high-resolution transmission electron microscopy, and electron energy loss spectroscopy, and used some data from previous research. CeO2 on the surface of V2O5-CeO2/CVC-TiO2 contained a higher ratio of Ce3+ ions. This was because many free carriers on the surface of the CVC-catalyst moved toward the surface of the loaded material that had higher binding energy (eV). Secondly, V2O5-CeO2/CVC-TiO2 had very little amorphous-phase CeO2 because of the inherent physical and structural properties. Finally, the CVC-catalyst showed higher reducibility and acidity when V2O5 and CeO2 were loaded onto CVC-TiO2 because of a higher number of oxygen species and hydroxyls on the catalyst surface. (C) 2016 Elsevier B.V. All rights reserved.