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Organo-NOx formation–decomposition as the origin of the changes in the low temperature NO-TPD profile in the presence of n-decane on Ag/γ-Al2O3

Paper ID Volume ID Publish Year Pages File Format Full-Text
50160 46783 2014 5 PDF Available
Title
Organo-NOx formation–decomposition as the origin of the changes in the low temperature NO-TPD profile in the presence of n-decane on Ag/γ-Al2O3
Abstract

•Excess release of NO, instead of NO2, was observed with concomitant n-C10 activation.•Indirect evidence for the Ag-assisted formation–decomposition of organo-NOx species.•This suggests the involvement of organo-NOx species as intermediates of n-C10-SCR.

The NOx desorption profiles obtained in O2–He and n-C10–O2–He were compared on γ-Al2O3 and Ag/γ-Al2O3. On Ag/γ-Al2O3, the low-temperature NOx desorption profiles obtained in n-C10–O2–He were significantly different from those obtained in O2–He. In particular, at 190–220 °C excess release of NO, instead of NO2, was observed concomitantly with n-C10 consumption. This is interpreted as the result of the formation–decomposition of organo-NOx species issued from the interaction of NO2 and hydrocarbons initially chemisorbed on Al2O3 and activated on Ag species, respectively. The occurrence of such a phenomenon at temperatures close to those at which the n-C10-SCR reaction starts provides support for the involvement of the organo-NOx species as intermediates.

Keywords
Lean deNOx; Selective catalytic reduction; n-C10-SCR; Catalysts; NOx-TPD
First Page Preview
Organo-NOx formation–decomposition as the origin of the changes in the low temperature NO-TPD profile in the presence of n-decane on Ag/γ-Al2O3
Publisher
Database: Elsevier - ScienceDirect
Journal: Catalysis Communications - Volume 46, 10 February 2014, Pages 81–85
Authors
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Subjects
Physical Sciences and Engineering Chemical Engineering Catalysis