Reactivity of surface complexes in the selective catalytic reduction of NOx on supported heteropoly compounds

The reactivity of surface complexes in the selective catalytic reduction of NO x on supported heteropoly compounds has been investigated by in situ IR spectroscopy. The best performance is shown by CeO 2 -supported catalysts. The conversion rate of the intermediate nitrate complexes obeys a zeroth-o...

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Bibliographic Details
Published in:Kinetics and catalysis 2014, Vol.55 (1), p.103-110
Main Authors: Sil’chenkova, O. N., Matyshak, V. A., Tret’yakov, V. F., Korchak, V. N.
Format: Article
Language:English
Subjects:
Catalysis
Chemistry
Chemistry and Materials Science
Physical Chemistry
Online Access:Get full text
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Summary:The reactivity of surface complexes in the selective catalytic reduction of NO x on supported heteropoly compounds has been investigated by in situ IR spectroscopy. The best performance is shown by CeO 2 -supported catalysts. The conversion rate of the intermediate nitrate complexes obeys a zeroth-order equation, like the formation rate of the propylene activation products, namely, surface acetate and formate complexes. The conversion rate of the surface nitrate complexes is determined by the propylene oxidation selectivity, which, in turn, is related to the composition of the heteropoly compound. Among the heteropoly compounds examined, the most appropriate ones are those in which vanadium ions are in both anionic and cationic positions. These pair sites serve to activate propylene, and the activation product reacts efficiently with the nitrate complexes.
ISSN:0023-1584
1608-3210
DOI:10.1134/S0023158414010133