Examination of surface phenomena of V2O5 loaded on new nanostructured TiO2 prepared by chemical vapor condensation for enhanced NH3-based selective catalytic reduction (SCR) at low temperatures

Abstract

In this article, we describe the investigation and surface characterization of a chemical vapor condensation (CVC)-TiO₂ support material used in a V₂O₅/TiO₂ catalyst for enhanced selective catalytic reduction (SCR) activity and confirm the mechanism of surface reactions. On the basis of previous studies and comparison with a commercial TiO₂ catalyst, we examine four fundamental questions: first, the reason for increased surface V⁴⁺ ion concentrations; second, the origin of the increase in surface acid sites; third, a basis for synergistic influences on improvements in SCR activity; and fourth, a reason for improved catalytic activity at low reaction temperatures. In this study, we have cited the result of SCR with NH₃ activity for removing NO_x and analyzed data using the reported result and data from previous studies on V₂O₅/CVC-TiO₂ for the SCR catalyst. In order to determine the properties of suitable CVC-TiO₂ surfaces for efficient SCR catalysis at low temperatures, CVC-TiO₂ specimens were prepared and characterized using techniques such as XRD, BET, HR-TEM, XPS, FT-IR, NH₃-TPD, photoluminescence (PL) spectroscopy, H₂-TPR, and cyclic voltammetry. The results obtained for the CVC-TiO₂ materials were also compared with those of commercial TiO₂.