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Palladium Supported on Alumina Catalysts Prepared by MOCVD and Impregnation Methods

Published online by Cambridge University Press:  15 February 2011

G. Garcia ,
J.R. Vargas ,
M.A. Valenzuela ,
M. Rebollar  and
D. Acosta
G. Garcia
Affiliation:
Dept. of Chemical Engineering, ESIQIE-IPN, México 07738 D.F., MEXICO
J.R. Vargas
Affiliation:
Dept. of Metallurgical Engineering, ESIQIE-IPN, AP 75-874, México 07300, D.F., MEXICO
M.A. Valenzuela
Affiliation:
Dept. of Chemical Engineering, ESIQIE-IPN, México 07738 D.F., MEXICO
M. Rebollar
Affiliation:
Dept. of Chemical Engineering, ESIQIE-IPN, México 07738 D.F., MEXICO
D. Acosta
Affiliation:
Institute of Physics, UNAM., AP 20-364, México 01000 D.F., MEXICO
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Abstract

Conventional MOCVD method has been explored to prepare Pd supported catalysts. Pd and PdO phases were found on the surface of the support. Small Pd particles about 1 to 3 nm and dispersions up to 19%were obtained by MOCVD. TPR results indicated that several surface Pd compounds are reduced. At temperatures below 25°C, PdO, the main compound, is completely converted to metallic Pd which forms hydrides. At higher temperatures, between 500 to 800°C, the reduction peaks could be attributed to Pd-support interactions and a strong support dehydroxylation. All catalysts were inactive in benzene hydrogenation and a significant conversion was only detected a temperatures above 100 °C. This was explained by the reduced accessibility of Pd sites imposed by the carbon contamination and by the Pd-Al2O3 interactions.

Keywords

MOCVDPd catalysts on aluminaHREMXRDTPRBenzene hydrogenation
Type
Research Article
Information
MRS Online Proceedings Library (OPL) , Volume 549: Symposium FF – Advanced Catalytic Materials - 1998 , 1998 , 237
Copyright
Copyright © Materials Research Society 1999

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