title: Influence of Mn valence state and characteristic of TiO2on the performance of Mn-Ti catalysts in ozone decomposition.
abstract: The effects of physicochemical properties of Mn-Ti catalysts on O3conversion were examined. The catalysts were prepared by a wet impregnation method that gave manganese supported on various commercial sources of TiO2. The properties of the catalysts were studied using physicochemical techniques, including Brunauer-Emmett-Teller (BET) surface area analysis, X-ray diffraction (XRD), H2temperature-programmed reduction (H2-TPR), X-ray photoelectron spectroscopy (XPS), and thermal gravimetric analysis (TGA). The O3decomposition tests of Mn-Ti catalysts with various manganese loadings revealed that the 10 wt% manganese catalyst exhibited optimal, excellent activity. The O3conversion and Mn valence state of the Mn-Ti catalysts were different, depending on the structure of the TiO2source. Increasing the O/Ti surface atomic ratio in TiO2increased the Mn3+ratio. The Mn3+ratio directly affected the O3decomposition activity of the Mn-Ti catalyst. When the Mn3+ratio was the largest, the catalyst showed the highest activity in O3decomposition. The valence state of Mn exposed to the surface was a critical factor in O3decomposition by Mn-Ti catalysts.
authors.affiliation: a Department of Environmental Energy Engineering , Graduate School of Kyonggi University , Youngtong-ku, Suwon-si, Gyeonggi-do , Republic of Korea.
authors.forename: Dong Wook
authors.initials: DW
authors.lastname: Kwon
authors.affiliation: a Department of Environmental Energy Engineering , Graduate School of Kyonggi University , Youngtong-ku, Suwon-si, Gyeonggi-do , Republic of Korea.
authors.forename: Geo Jong
authors.initials: GJ
authors.lastname: Kim
authors.affiliation: a Department of Environmental Energy Engineering , Graduate School of Kyonggi University , Youngtong-ku, Suwon-si, Gyeonggi-do , Republic of Korea.
authors.forename: Jong Min
authors.initials: JM
authors.lastname: Won
authors.affiliation: a Department of Environmental Energy Engineering , Graduate School of Kyonggi University , Youngtong-ku, Suwon-si, Gyeonggi-do , Republic of Korea.
authors.forename: Sung Chang
authors.initials: SC
authors.lastname: Hong
mesh_terms: D002384:Catalysis; D008345:Manganese / Q000737:chemistry*; D010126:Ozone / Q000737:chemistry*; D014025:Titanium / Q000737:chemistry*; D014865:Waste Disposal, Fluid / Q000379:methods*; D018508:Water Purification / Q000379:methods*
chemical_list: C009495:titanium dioxide; D008345:Manganese; D010126:Ozone; D014025:Titanium
keywords: Mn valence state; MnOx oxide; catalytic decomposition; manganese oxide; ozone