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NOx storage properties of Pt/Ba/Al model catalysts prepared by different methods: Beneficial effects of a N2 pre-treatment before hydrothermal aging

Paper ID Volume ID Publish Year Pages File Format Full-Text
48186 46496 2008 10 PDF Available
Title
NOx storage properties of Pt/Ba/Al model catalysts prepared by different methods: Beneficial effects of a N2 pre-treatment before hydrothermal aging
Abstract

The influence of a pre-treatment at 700 °C, either under a O2/N2 mixture or only under N2, and followed by a hydrothermal aging at 700 °C under wet air, was studied for Pt/Ba/Al NSR model catalysts prepared by different methods: (i) successive impregnation of Ba and Pt, (ii) co-addition of Pt and Ba and (iii) barium precipitation followed by Pt impregnation. The catalysts were evaluated by NOx storage capacity measurements and were characterized by N2 adsorption, XRD, CO2-TPD, H2 chemisorption and H2-TPR. The pre-treatment under N2 largely improves the NOx storage performance in the whole studied temperature range (200–400 °C), with or without H2O and CO2 in the inlet gas. The better NOx storage properties of the catalysts treated under N2 before aging are due to: (i) a higher NO oxidation activity (mainly linked to a higher platinum dispersion), (ii) a higher number of NOx storage sites resulting from a higher barium dispersion, and consequently to (iii) a higher Pt-Ba proximity.

Keywords
NOx storage; NOx trap; Ba; Barium; Pt; Platinum; Thermal aging; Dispersion; Proximity; N2 treatment
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NOx storage properties of Pt/Ba/Al model catalysts prepared by different methods: Beneficial effects of a N2 pre-treatment before hydrothermal aging
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Publisher
Database: Elsevier - ScienceDirect
Journal: Applied Catalysis B: Environmental - Volume 84, Issues 3–4, 1 December 2008, Pages 514–523
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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Any Questions? feel free to contact us