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Operando FTIR study of NOx storage over a Pt/K/Mn/Al2O3-CeO2 catalyst

Paper ID Volume ID Publish Year Pages File Format Full-Text
48966 46533 2007 12 PDF Available
Title
Operando FTIR study of NOx storage over a Pt/K/Mn/Al2O3-CeO2 catalyst
Abstract

The storage of NOx under lean conditions has been studied for a Pt/K/Mn/Al2O3-CeO2 catalyst by operando FTIR spectroscopy. We have found that the first step of NOx adsorption is NO oxidation, NO2 being subsequently stored on potassium sites as nitrites; thereafter, nitrites are finally oxidized to nitrates by further NO2 molecules. It has been pointed out that the kinetic of these processes is strongly related to NO oxidation rate, both of them being slow at low temperatures, whereas they proceed faster at high temperatures. Two different periods have been characterized during NOx storage, a first one presenting full consumption of the nitrogen oxides, and a second one where NO and NO2 appear in the gas phase, to finally reach a steady level; the parameters governing the length of these periods are the progressive adsorption of NOx all along the sample and the presence of two different potassium sites, i.e. surface and bulk sites. Finally, the excellent storage properties of the catalyst studied here have been correlated with the presence of a particular phase, which has been characterized by transmission electron microscopy (TEM).

Keywords
Diesel; Lean-burn; In situ analysis; KNO3; Lean NOx-Trap; NO2; NOx storage; Operando FTIR; Reaction mechanism
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Operando FTIR study of NOx storage over a Pt/K/Mn/Al2O3-CeO2 catalyst
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Publisher
Database: Elsevier - ScienceDirect
Journal: Applied Catalysis B: Environmental - Volume 72, Issues 1–2, 8 March 2007, Pages 166–177
Authors
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Subjects
Physical Sciences and Engineering Chemical Engineering Catalysis
Get Full-Text Now
Don't Miss Today's Special Offer
Price was $35.95
You save - $31
Price after discount Only $4.95
100% Money Back Guarantee
Full-text PDF Download
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