Characterization of niobium-zirconium mixed oxide as a novel catalyst for selective catalytic reduction of NO x
Author
Cayirtepe, I.
Naydenov, A.
Ivanov, G.
Kantcheva, M.
Date
2009Source Title
Catalysis Letters
Print ISSN
1011-372X
Volume
132
Issue
3-4
Pages
438 - 449
Language
English
Type
ArticleItem Usage Stats
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Abstract
The performance of mixed niobium-zirconium oxide in the SCR of NO x with propene in excess oxygen has been studied. The mixed oxide is prepared by impregnation of hydrated zirconia with acidic solution (pH 0.5) of peroxoniobium(V) complex, [Nb2(O2)3] 4+, ensuring ZrO2:Nb2O5 mole ratio of 6:1. The calcined sample (denoted as 25NbZ-P) has the structure of Zr 6Nb2O17. According to the catalytic test, the conversion of NO x over the 25NbZ-P catalyst passes through a maximum at 220 °C. Based on the in situ FT-IR results, a reaction mechanism is proposed with nitroacetone and NCO species as the key reaction intermediates. The results of the investigation show that the catalytic properties of the Zr6Nb2O17 solid solution could be of interest regarding the development of low-temperature catalyst for the SCR of NO x with hydrocarbons. © 2009 Springer Science+Business Media, LLC.
Keywords
C3H6-SCR of NO xCatalytic activity
In situ FT-IR spectroscopy
Zirconia-niobia solid solution
Acidic solutions
C<sub>3</sub>H<sub>6</sub>-SCR of NO <sub>x</sub>
Catalytic properties
Catalytic tests
Excess oxygen
In-situ
Key reactions
Low temperatures
Mixed oxide
Mole ratio
Novel catalysts
Reaction mechanism
SCR of NO
Selective catalytic reduction of NO
Zirconium oxide
Calcination
Catalyst activity
Crystallization
Electrochemical sensors
Hydrates
Hydrocarbons
Niobium
Niobium compounds
Oxygen
Propylene
Solid solutions
Solidification
Zirconia
Zirconium
Selective catalytic reduction
Permalink
http://hdl.handle.net/11693/22602Published Version (Please cite this version)
http://dx.doi.org/10.1007/s10562-009-0150-5Collections
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