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Effect of carbon black combustion on NOx trap catalyst performances

Paper ID Volume ID Publish Year Pages File Format Full-Text
55362 47049 2012 5 PDF Available
Title
Effect of carbon black combustion on NOx trap catalyst performances
Abstract

The effect of carbon–NSR catalyst contact on the ability of the catalyst to store NOx is investigated. The catalysts used are model catalysts composed of Pt and/or Ba supported on Al2O3 (2%Pt/γ-Al2O3, 20%BaO/γ-Al2O3 and 2%Pt–20%BaO/γ-Al2O3). It is shown that the presence of carbon black in the catalytic bed involves a decrease of the NOx storage capacity (NSC) of the catalysts. Participation of a direct reaction between carbon particles and NOx storage sites to form carbonate adsorbed species is proposed. However, the loss of NSC measured in the presence of carbon varies as a function of the catalyst composition. It is shown that the presence of platinum limits the influence of carbon–catalyst contact. The influence of the proximity between the storage sites, Pt sites and their contact with carbon is discussed.

Graphical abstractFigure optionsDownload full-size imageDownload high-quality image (133 K)Download as PowerPoint slideHighlights► Effect of carbon–catalyst contact on the NOx storage capacity of NSC catalysts. ► Presence of platinum in the catalyst composition limits the influence of carbon–catalyst contact. ► Nitrate adsorption sites far from Pt sites and in contact of carbon sites are destabilized while those close to Pt suffer to a lesser extent of contact with carbon.

Keywords
NOx storage capacity; Soot; Sintering; Platinum based catalyst; Baryium nitrate
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Effect of carbon black combustion on NOx trap catalyst performances
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Publisher
Database: Elsevier - ScienceDirect
Journal: Catalysis Today - Volume 189, Issue 1, 30 July 2012, Pages 60–64
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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