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

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.