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Loss of NOx storage capacity of Pt–Ba/Al2O3 catalysts due to incorporation of phosphorous

Paper ID Volume ID Publish Year Pages File Format Full-Text
52054 46864 2008 6 PDF Available
Title
Loss of NOx storage capacity of Pt–Ba/Al2O3 catalysts due to incorporation of phosphorous
Abstract

This work aims at determining the effect of the incorporation of P on NOx storage capacity by NOx storage-reduction (NSR) catalysts. Different amounts of phosphorous were deposited on a Pt–Ba/Al2O3 catalyst (1 wt% Pt and 17 wt% Ba) by impregnation of a phosphate salt. Samples were calcined at 723 K and characterized using X-ray diffraction (XRD), N2 adsorption isotherms and X-ray photoelectron spectroscopy (XPS). Their NOx storage capacity was also measured. It was observed that storage capacity decreased almost linearly with the P/Ba ratio and besides at a phosphorous concentration P/Ba ratio of <0.1 deterioration was low. At higher P concentrations (P/Ba ratio = 0.7) the NOx storage was significantly reduced. It is proposed that the cause of the decline in NOx retention capacity would be the formation of Ba–P phases (very likely Ba phosphates) at the expense of Ba carbonate or Ba oxide. These new phases would be unable to exchange NOx.

Keywords
Phosphorous; NOx storage capacity; Pt–Ba/Al2O3; Contaminant; Impregnation
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Loss of NOx storage capacity of Pt–Ba/Al2O3 catalysts due to incorporation of phosphorous
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Publisher
Database: Elsevier - ScienceDirect
Journal: Catalysis Communications - Volume 9, Issue 3, 1 March 2008, Pages 327–332
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