title: Improving the activity of Mn/TiO2catalysts through control of the pH and valence state of Mn during their preparation.
abstract: In this study, the authors investigated the influence of the valence state of Mn on the efficacy of selective catalytic reduction using a Mn-based catalyst. The nitrogen oxides (NOx) conversion rate of the catalyst was found to be dependent on the type of TiO2 support employed and on the temperature, as the catalyst showed an excellent conversion of > 80% at a space velocity of 60,000 hr(-1) when the temperature was above 200 degrees C. Brunauer-Emmett-Teller, X-ray diffraction, and X-ray photoelectron spectroscopy analyses confirmed that catalyst displaying the highest activity contained the Mn4+ species and that its valence state was highly dependent on the pH during the catalyst preparation.
authors.affiliation: Department of Environmental Energy Systems Engineering, Graduate School of Kyonggi University, Iui-dong, Yeongtong-gu, Suwon-si, Gyeonggi-do, Republic of Korea. [corrected].
authors.forename: Hyun Jin
authors.initials: HJ
authors.lastname: Choi
authors.forename: Sung Su
authors.initials: SS
authors.lastname: Kim
authors.forename: Sung Chang
authors.initials: SC
authors.lastname: Hong
mesh_terms: D000393:Air Pollutants / Q000737:chemistry*; D000397:Air Pollution / Q000517:prevention & control; D002384:Catalysis; D002412:Cations; D006801:Humans; D006863:Hydrogen-Ion Concentration; D009589:Nitrogen Oxides / Q000737:chemistry*; D014025:Titanium / Q000737:chemistry
chemical_list: D000393:Air Pollutants; D002412:Cations; D009589:Nitrogen Oxides; C009495:titanium dioxide; D014025:Titanium