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An investigation of a new regeneration method of commercial aged three-way catalysts

Paper ID Volume ID Publish Year Pages File Format Full-Text
49194 46564 2006 8 PDF Available
Title
An investigation of a new regeneration method of commercial aged three-way catalysts
Abstract

The ability to modify aged three-way catalysts (TWC) by regaining part of the fresh catalyst surface structure has been verified by both bulk and surface-sensitive characterisation techniques. X-ray photoelectron spectroscopy (XPS) and scanning electron microscopy (SEM/EDX) techniques were applied to fully evaluate the efficiency of a regeneration procedure of commercial three-way catalysts targeting the washcoat surface. The regeneration comprised combined thermal and liquid chlorine treatments. Structural changes of the washcoat were further investigated with nitrogen adsorption-desorption (BET) and Laser Ablation methods. The investigation showed that the regeneration treatments resulted in an enrichment of the washcoat surface with palladium, thereby increasing the number of catalytically active surface sites. Furthermore, the observed removal of phosphorous and sulphur contaminants resulted in an increase of the relative amount of small pores between 1 and 10 nm and washcoat surface area. An increased catalytic activity regarding CO, NOx and HC emissions was observed after regeneration, providing proof of the proposed concept.

Keywords
Three-way automotive catalyst; Regeneration; Characterisation; Pd; Rh; Deactivation; Fouling; Poisoning; Dispersion; XPS; Laser Ablation
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An investigation of a new regeneration method of commercial aged three-way catalysts
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Publisher
Database: Elsevier - ScienceDirect
Journal: Applied Catalysis B: Environmental - Volume 65, Issues 1–2, 15 May 2006, Pages 93–100
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
Online Support
Any Questions? feel free to contact us