Characterization of niobium-zirconium mixed oxide as a novel catalyst for selective catalytic reduction of NO x

Date
2009
Authors
Cayirtepe, I.
Naydenov, A.
Ivanov, G.
Kantcheva, M.
Advisor
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Instructor
Source Title
Catalysis Letters
Print ISSN
1011-372X
Electronic ISSN
Publisher
Volume
132
Issue
3-4
Pages
438 - 449
Language
English
Type
Article
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Volume Title
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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.

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Keywords
C3H6-SCR of NO x, Catalytic 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
Citation
Published Version (Please cite this version)