title: 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 V(4+) 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 NOx 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.
authors.affiliation: Green School, Korea University-KIST, 145 Anam-ro, Seongbuk-gu, Seoul 136-701, Republic of Korea.
authors.forename: Woojoon
authors.initials: W
authors.lastname: Cha
authors.forename: Seong-Taek
authors.initials: ST
authors.lastname: Yun
authors.forename: Jongsoo
authors.initials: J
authors.lastname: Jurng
mesh_terms: D000327:Adsorption; D000641:Ammonia / Q000737:chemistry*; D002384:Catalysis; D003080:Cold Temperature; D005740:Gases / Q000737:chemistry*; D008422:Materials Testing; D053768:Metal Nanoparticles / Q000737:chemistry* / Q000648:ultrastructure*; D010316:Particle Size; D013499:Surface Properties; D014025:Titanium / Q000737:chemistry*; D017968:Vanadium Compounds / Q000737:chemistry*
chemical_list: D005740:Gases; D017968:Vanadium Compounds; C009495:titanium dioxide; D000641:Ammonia; C066075:vanadium pentoxide; D014025:Titanium