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

被引：50

作者：

Garrido, G. Incera ^{[1
]}

Patcas, F. C. ^{[1
]}

Upper, G. ^{[2
]}

Tuerk, M. ^{[2
]}

Yilmaz, S. ^{[3
]}

Kraushaar-Czarnezki, B. ^{[1
]}

机构：

[1] Univ Karlsruhe, Inst Chem Proc Engn CVT, D-76128 Karlsruhe, Germany

[2] Univ Karlsruhe, Inst Tech Thermodynam & Refrigerat ITTK, D-76128 Karlsruhe, Germany

[3] Izmir Inst Technol, Dept Chem Engn, TR-35497 Izmir, Turkey

来源：

APPLIED CATALYSIS A-GENERAL | 2008年 / 338卷 / 1-2期

关键词：

supercritical fluid; platinum; nanoparticle; CO oxidation; ceramic foam;

D O I：

10.1016/j.apcata.2007.12.019

中图分类号：

O64 [物理化学（理论化学）、化学物理学];

学科分类号：

070304 ; 081704 ;

摘要：

Deposition and reduction of an organometallic platinum complex from a supercritical Pt(COD)Me(2)/CO(2) solution was carried out to produce Pt/ SnO(2) catalysts supported on Al(2)O(3) 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)Me(2) in CO(2) increases from 5.9 x 10(-4) mol/mol at 11.2 MPa and 313 K to 3.4 x 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. (c) 2007 Elsevier B.V. All rights reserved.

引用

页码：58 / 65

页数：8

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