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

Paper ID Volume ID Publish Year Pages File Format Full-Text
41399 45888 2011 7 PDF Available
Title
Dispersion measurement of platinum supported on Yttria-Stabilised Zirconia by pulse H2 chemisorption
Abstract

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 H2 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 °C before the H2 pulse chemisorption performed at −28 °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 H2 and CO chemisorptions.

Graphical abstractFigure optionsDownload full-size imageDownload high-quality image (105 K)Download as PowerPoint slideHighlights► A reliable procedure was defined to measure the dispersion of Pt nanoparticles supported on Yttria-Stabilised Zirconia. ► A pre-reduction step in hydrogen at 500 °C and a H2 pulse chemisorption at −28 °C are required. ► Surface oxygen vacancies on the YSZ support are involved in H2 and CO chemisorption.

Keywords
Hydrogen pulse chemisorption; Pt dispersion; Yttria-Stabilised Zirconia; Oxygen vacancies; Ionic conductor
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Dispersion measurement of platinum supported on Yttria-Stabilised Zirconia by pulse H2 chemisorption
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Publisher
Database: Elsevier - ScienceDirect
Journal: Applied Catalysis A: General - Volume 403, Issues 1–2, 22 August 2011, Pages 18–24
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
100% Money Back Guarantee
Full-text PDF Download
Online Support
Any Questions? feel free to contact us