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In Situ Oxidation and Reduction of Small Pd Particles on Silica

Published online by Cambridge University Press:  02 July 2020

Peter A Crozier  and
Renu Sharma
Peter A Crozier
Affiliation:
Center for Solid State Science, Arizona State University, Tempe, AZ85287-1704, USA.
Renu Sharma
Affiliation:
Center for Solid State Science, Arizona State University, Tempe, AZ85287-1704, USA.
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Extract

Palladium based catalyst have technological applications in catalytic converters in automobile industry for the combustion of NOx and CO gasses. Pd can also adsorb up to 900 times its volume H2 and is useful for purifying H2. Electron holography studies with model Pd on silica catalysts [1] show that under some circumstances, the Pd particles may form voids. The reason for the formation of these voids and the conditions under which they are formed are not well understood. We have done in situ and ex situ studies on oxidation and reduction of similar model Pd/SiO2 to develop a better understanding of the conditions under which voids are formed.

The catalyst samples were prepared by impregnating silica with acetyl acetoneate (acac) and oxidizing in air and then reducing in H2 at 300°C [1]. High resolution images (Fig. 1) of Pd particles show a central feature with low contrast attributed to the presence of voids.

Type
Nanophase and Amorphous Materials
Information
Microscopy and Microanalysis , Volume 4 , Issue S2: Proceedings: Microscopy & Microanalysis '98, Microscopy Society of America 56th Annual Meeting, Microbeam Analysis Society 32nd Annual Meeting, Atlanta, Georgia July 12-16, 1998 , July 1998 , pp. 748 - 749
Copyright
Copyright © Microscopy Society of America

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References

1.Datye, A.K. et al, in Electron Holography (1995) Elsevier Science B.V., Amsterdam, pg 199.Google Scholar
2.Sharma, R. et al, (to be published)Google Scholar
3. We would like to thank A. K. Dayte for provide the samples and I. Chan for encouragement and support. Funding was provided DOE and the Industrial Associates Program of Arizona State University (ASU) and the project was performed in the Center for HREM at ASU.Google Scholar