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Novel mesoporous aluminosilicate supported palladium-rhodium catalysts for diesel upgrading ☆: I. Preparation and characterisation

Paper ID Volume ID Publish Year Pages File Format Full-Text
43474 45971 2008 7 PDF Available
Title
Novel mesoporous aluminosilicate supported palladium-rhodium catalysts for diesel upgrading ☆: I. Preparation and characterisation
Abstract

Bimetallic PdRh (with Pd/Rh mole ratio = 2/1) catalysts supported on a mesoporous aluminosilicate have been prepared and three methods of metal incorporation in the support have been compared: direct incorporation into the synthesis gel, impregnation and ion-exchange. Physico-chemical characterisations (nitrogen adsorption–desorption, hydrogen chemisorption, transmission electron microscopy, X-ray photoelectron and extended X-ray absorption fine structure spectroscopies), as well as simulated coking and regeneration tests are described. The dispersion, metal particle size and the formation of bimetallic particles within the material depend on the method of metal incorporation. Direct incorporation and ion-exchange methods lead to co-existence of PdRh intermetallic aggregates and segregated Pd; on the other hand, the impregnation method leads to the formation of very small and well dispersed PdRh alloy particles, with Pd preferentially located on the alloy particle surface.

Graphical abstractThe preparation and characterisation of novel bimetallic PdRh catalysts supported on a mesoporous aluminosilicate are described. The association of a range of different techniques including adsorption from the gas-phase and element-specific spectroscopies (such as XPS and EXAFS) provide converging results indicating the existence of intermetallic particles with palladium preferentially located on the particle surfaces. Figure optionsDownload full-size imageDownload as PowerPoint slide

Keywords
Supported bimetallic palladium-rhodium catalyst; Metal dispersion; Particle size; Intermetallic aggregates; X-ray absorption spectroscopy
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Novel mesoporous aluminosilicate supported palladium-rhodium catalysts for diesel upgrading ☆: I. Preparation and characterisation
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Publisher
Database: Elsevier - ScienceDirect
Journal: Applied Catalysis A: General - Volume 340, Issue 2, 1 June 2008, Pages 250–256
Authors
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Subjects
Physical Sciences and Engineering Chemical Engineering Catalysis
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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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