NDLI: Reversibility of Mn Valence State in MnOx/TiO2 Catalysts for Low-temperature Selective Catalytic Reduction for NO with NH3

Content Provider	Springer Nature Link
Author	Park, Kwang Hee Lee, Sang Moon Kim, Sung Su Kwon, Dong Wook Hong, Sung Chang
Copyright Year	2013
Abstract	Selective catalytic reduction (SCR) of NO with NH3 was investigated using TiO2-supported Mn oxide catalysts prepared by wet impregnation at different MnO x loadings and reduction temperatures. The structures, valence states, and physicochemical properties were characterized using Brunauer–Emmett–Teller, X-ray diffraction, Raman, and X-ray photoelectron methods. The 20 wt% MnO x /TiO2 catalyst, which was rich in Mn4+ species, showed the best SCR activity and N2 selectivity at low temperatures. As the reduction temperature increased, the Mn valence states gradually changed from Mn4+ to Mn2+. When the valence state was lowered (Mn4+ to Mn2+), the SCR activity decreased significantly at low temperatures. H2 shut-off tests confirmed that the activity of the reduced catalyst was not fully recovered. For superior SCR activity at low temperatures, the MnO x species on the MnO x /TiO2 catalyst surface should be kept as Mn4+.
Starting Page	246
Ending Page	253
Page Count	8
File Format	PDF
ISSN	1011372X
Journal	Catalysis Letters
Volume Number	143
Issue Number	3
e-ISSN	1572879X
Language	English
Publisher	Springer US
Publisher Date	2013-01-09
Publisher Place	Boston
Access Restriction	One Nation One Subscription (ONOS)
Subject Keyword	MnOx/TiO2 NH3-Selective catalytic reduction Nitrogen oxides Mn valence state Catalysis Industrial Chemistry/Chemical Engineering Organometallic Chemistry Physical Chemistry
Content Type	Text
Resource Type	Article
Subject	Chemistry Catalysis

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