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Design of catalysts for deNOx process using synergistic phenomenon

Paper ID Volume ID Publish Year Pages File Format Full-Text
48790 46522 2007 10 PDF Available
Title
Design of catalysts for deNOx process using synergistic phenomenon
Abstract

Investigation of the mechanism of the selective reduction of NOx by propane over the individual samples of commercial catalysts NTK, STK, and Ni–Cr-oxide catalyst and over their binary mechanical mixtures has shown that the synergistic effect observed in the latter case is caused by the oxidative activation of propane on the STK and Ni–Cr-oxide surface which results in the formation of more effective reducing agents, propylene and hydrogen correspondingly. In the case of the Ni–Cr-oxide and NTK catalytic system, hydrogen forms over the former catalyst in propane oxidation, migrates through the gas phase to the latter catalyst, where NOx is activated with the formation of nitrate structures which interact with the said hydrogen giving the products of the overall reaction, N2 and H2O. When the pair of NTK and STK is concerned, the interaction of C3H8 and O2 over the latter catalyst gives stable products of partial propane oxidation and/or oxidative dehydrogenation which are transported due to interphase diffusion to NTK surface. The nature of observed synergistic enhancement of catalysis in the case of binary mixtures is proposed under the terms of “remote control” mechanism described in literature and can serve a useful purpose in the design of catalysts for this reaction.

Keywords
Selective reduction of nitrogen oxides; The reaction mechanism; Mechanical mixture of oxide catalysts; Synergy
First Page Preview
Design of catalysts for deNOx process using synergistic phenomenon
Publisher
Database: Elsevier - ScienceDirect
Journal: Applied Catalysis B: Environmental - Volume 70, Issues 1–4, 31 January 2007, Pages 128–137
Authors
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Subjects
Physical Sciences and Engineering Chemical Engineering Catalysis