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Supercritical deposition of Pt on SnO2-coated Al2O3 foams: Phase behaviour and catalytic performance

Paper ID Volume ID Publish Year Pages File Format Full-Text
43038 45952 2008 8 PDF Available
Title
Supercritical deposition of Pt on SnO2-coated Al2O3 foams: Phase behaviour and catalytic performance
Abstract

Deposition and reduction of an organometallic platinum complex from a supercritical Pt(COD)Me2/CO2 solution was carried out to produce Pt/SnO2 catalysts supported on Al2O3 foams for CO oxidation at moderate temperatures. The phase behaviour of the complex in supercritical carbon dioxide was investigated to find the optimum pressure and temperature conditions for the deposition. For the Pt(COD)Me2/CO2 mixture, the melting point decreased with increasing pressure from 378 K at 0.1 MPa to 360 K at 25.6 MPa. Additional investigations showed that the solubility of Pt(COD)Me2 in CO2 increases from 5.9 × 10−4 mol/mol at 11.2 MPa and 313 K to 3.4 × 10−3 mol/mol at 29.6 MPa and 353 K. The supercritical deposition yielded catalysts with highly dispersed platinum nanoparticles of approx. 3 nm having a narrow size distribution and thus, a superior activity towards oxidation of carbon monoxide in comparison to a catalyst prepared by the conventional aqueous impregnation of Pt.

Graphical abstractThe deposition of platinum from an organometallic platinum complex dissolved in supercritical CO2 solution produced Pt/SnO2 catalysts having a narrow particle size distribution around 3 nm. These catalysts had a much higher activity in the low-temperature oxidation of carbon monoxide than a Pt/SnO2 catalyst prepared by conventional wet deposition. The thermodynamics of the system Pt(COD)Me2/scCO2 were studied to determine the conditions for an optimal Pt deposition.Figure optionsDownload full-size imageDownload as PowerPoint slide

Keywords
Supercritical fluid; Platinum; Nanoparticle; CO oxidation; Ceramic foam
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Supercritical deposition of Pt on SnO2-coated Al2O3 foams: Phase behaviour and catalytic performance
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Publisher
Database: Elsevier - ScienceDirect
Journal: Applied Catalysis A: General - Volume 338, Issues 1–2, 1 April 2008, Pages 58–65
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
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