Low-temperature NO oxidation over Mn/TiO2 nanocomposite synthesized by chemical vapor condensation: effects of Mn precursor on the surface Mn species

Title
Low-temperature NO oxidation over Mn/TiO2 nanocomposite synthesized by chemical vapor condensation: effects of Mn precursor on the surface Mn species
Authors
박은석진성민정주영정종수
Keywords
chemical vapor condensation; Mn/TiO2 nanocomposites; nanocomposite; Impregnation; NO oxidation; Low-temperature
Issue Date
2012-11
Publisher
Microporous and mesoporous materials
Citation
VOL 163, 96-101
Abstract
Mn/TiO2 nanocomposite materials for low-temperature selective NO oxidation was prepared through the impregnation of manganese acetate or manganese nitrate precursors on TiO2 particles fabricated by chemical vapor condensation. Improved low-temperature NO conversion resulted when manganese acetate precursor was used: NO oxidation activity was maximized at 88% at 225 ℃. The materials were characterized by BET, XRD, HR-TEM, XPS and H2-TPR. The increased activity was attributed to the manganese acetate precursor providing well-dispersed Mn species on the material’s surface and increasing its surface area. Abundant Mn3+ species, hydroxyl groups, increased oxygen linking to Mn, and high concentrations of amorphous Mn on the surface resulted in the material’s improved activity towards NO oxidation at lower temperatures.
URI
http://pubs.kist.re.kr/handle/201004/43739
ISSN
13871811
Appears in Collections:
KIST Publication > Article
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