Dispersion measurement of platinum supported on Yttria-Stabilised Zirconia by pulse H2 chemisorption

被引：27

作者：

Fortunato, M. Alves ^{[1
]}

Aubert, D. ^{[1
]}

Capdeillayre, C. ^{[1
]}

Daniel, C. ^{[2
]}

Hadjar, A. ^{[2
]}

Princivalle, A. ^{[1
]}

Guizard, C. ^{[1
]}

Vernoux, P. ^{[1
,2
]}

机构：

[1] CNRS St Gobain CREE, UMR3080, Lab Synth & Fonctionnalisat Ceram, F-84306 Cavaillon, France

[2] Univ Lyon 1, CNRS, UMR 5256, IRCELYON,Inst Rech Catalyse & Environm Lyon, F-69626 Villeurbanne, France

来源：

APPLIED CATALYSIS A-GENERAL | 2011年 / 403卷 / 1-2期

关键词：

Hydrogen pulse chemisorption; Pt dispersion; Yttria-Stabilised Zirconia; Oxygen vacancies; Ionic conductor; ELECTROCHEMICAL PROMOTION; CATALYSTS; ADSORPTION; ION;

D O I：

10.1016/j.apcata.2011.06.005

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：

Platinum nanoparticles were dispersed by wet impregnation on YSZ (8 mol% Y2O3) an ionically conducting support. The Pt dispersion of a series of catalysts was determined by using H-2 pulse chemisorption. Temperature Programmed Reduction (TPR) experiments were performed to characterize the pre-reduction step before dispersion measurements. Finally, a fast and reliable procedure was defined for the Pt dispersion measurements consisting in a pre-reduction step in hydrogen at 500 degrees C before the H-2 pulse chemisorption performed at -28 degrees C. Reproducible Pt dispersion values were obtained in good agreement with those measured by pulse CO chemisorptions and static volumetric titration. In addition, the combination of Diffuse Reflectance Infrared Fourier Transform (DRIFT) spectroscopy and TPR has evidenced the role of surface oxygen vacancies on YSZ support for both H-2 and CO chemisorptions. (C) 2011 Elsevier B.V. All rights reserved.

引用

页码：18 / 24

页数：7

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