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The role of additives in the catalytic reduction of NO by CO over Pd-In/SiO2 and Pd-Pb/SiO2 catalysts

Paper ID Volume ID Publish Year Pages File Format Full-Text
44422 46025 2007 7 PDF Available
Title
The role of additives in the catalytic reduction of NO by CO over Pd-In/SiO2 and Pd-Pb/SiO2 catalysts
Abstract

Addition effect of In and Pb on the NO-CO reaction over SiO2 supported Pd catalysts was studied, using a closed gas circulation system as well as in situ infrared, XRD and XPS spectroscopies. Formation of intermetallic compounds was observed in the cases of both Pd-In/SiO2 and Pd-Pb/SiO2 catalysts. These compounds caused a drastic enhancement of the reaction rate of N2O formation. Infrared analyses revealed the weakening of CO adsorption on Pd metal by the formation of intermetallic compounds, which is the main reason of the enhancement of reaction rate. Over Pd/SiO2, the reaction may proceed via redox mechanism through NO dissociation to form the oxidized surface, followed by its reduction with CO. By adding In or Pb, a new reaction pathway is opened at the lower temperature region via NO dimer-like intermediates. The role of additives is the stabilization of these unique intermediates on the slightly oxidized intermetallic compound surfaces.

Graphical abstractFormation of intermetallic compounds was observed in the cases of both Pd-In/SiO2 and Pd-Pb/SiO2 catalysts, which caused a drastic enhancement of the reaction rate of N2O formation. By adding In or Pb, a new reaction pathway is opened via NO dimer-like intermediates, and the role of additives is the stabilization of these unique intermediates on the slightly oxidized intermetallic compound.Figure optionsDownload full-size imageDownload as PowerPoint slide

Keywords
NO-CO reaction; Pd/SiO2 catalyst; Addition effect; Pd-In; Pd-Pb
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The role of additives in the catalytic reduction of NO by CO over Pd-In/SiO2 and Pd-Pb/SiO2 catalysts
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Publisher
Database: Elsevier - ScienceDirect
Journal: Applied Catalysis A: General - Volume 320, 22 March 2007, Pages 91–97
Authors
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Subjects
Physical Sciences and Engineering Chemical Engineering Catalysis
Get Full-Text Now
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Price was $35.95
You save - $31
Price after discount Only $4.95
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