Influence of Mn valence state and characteristic of TiO2 on the performance of Mn–Ti catalysts in ozone decomposition. Issue 22 (17th November 2017)

• Record Type: Journal Article
• Authors: Kwon, Dong Wook; Kim, Geo Jong; Won, Jong Min; Hong, Sung Chang
• Is Part Of: Environmental technology. Volume 38:Issue 22(2017)
• Page Start: 2785
• Page End: 2792
• Publication Date: 2017-11-17
• Subjects: Mn valence state -- manganese oxide -- ozone -- catalytic decomposition -- MnOx oxide; Environmental engineering -- Periodicals; Environmental protection -- Periodicals; 628.05
• DOI: 10.1080/09593330.2016.1278274
• Languages: English
• ISSNs: 0959-3330

Abstract

ABSTRACT: The effects of physicochemical properties of Mn–Ti catalysts on O3 conversion 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), H2 temperature-programmed reduction (H2 -TPR), X-ray photoelectron spectroscopy (XPS), and thermal gravimetric analysis (TGA). The O3 decomposition tests of Mn–Ti catalysts with various manganese loadings revealed that the 10 wt% manganese catalyst exhibited optimal, excellent activity. The O3 conversion and Mn valence state of the Mn–Ti catalysts were different, depending on the structure of the TiO2 source. Increasing the O/Ti surface atomic ratio in TiO2 increased the Mn 3+ ratio. The Mn 3+ ratio directly affected the O3 decomposition activity of the Mn–Ti catalyst. When the Mn 3+ ratio was the largest, the catalyst showed the highest activity in O3 decomposition. The valence state of Mn exposed to the surface was a critical factor in O3 decomposition by Mn–Ti catalysts.