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Improved palladium only three-way catalysts using phosphorus modified alumina support

Paper ID Volume ID Publish Year Pages File Format Full-Text
51374 46841 2012 6 PDF Available
Title
Improved palladium only three-way catalysts using phosphorus modified alumina support
Abstract

Alumina with different amounts of phosphorus dopants was synthesized by sol–gel method, and has been used as the support for three-way catalysts (TWC). The P-doped samples display improved catalytic activity for CO/NOx/HC conversion. Moderate improvements of Pd dispersion are also noticed in the P-doped samples. It is confirmed that the active phosphorus species exist as P–O–Al units on the surface, which are mutually stabilized with Pd clusters. These dopants not only suppress the particles sintering and phase transformation during the ageing, but also decorate the Pd particles to be more active in TWC reactions.

► The surface area of γ-alumina increases as increasing the amount of P dopants. ► Phosphorus hinders the phase transition of γ-alumina at the high-temperatures. ► The aged P-doped catalysts exert the outstanding TWC activities. ► The P–O–Al sites strongly inhibit Pd sintering against the hydrothermal treatment.

Keywords
Phosphorus modified alumina; Palladium; Three-way catalysts
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Improved palladium only three-way catalysts using phosphorus modified alumina support
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Publisher
Database: Elsevier - ScienceDirect
Journal: Catalysis Communications - Volume 22, 10 May 2012, Pages 28–33
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
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Full-text PDF Download
Online Support
Any Questions? feel free to contact us