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Mocvd Palladium and Platinum Supported on Alumina Catalysts: Preparation and Characterization

Published online by Cambridge University Press:  10 February 2011

Z. K. Lopez ,
J. R. Vargas ,
M. A. Valenzuela  and
D. R. Acosta
Z. K. Lopez
Affiliation:
Dept. of Chemical Engineering, ESIQIE-IPN, 07738, Mexico, D.F., MEXICO
J. R. Vargas
Affiliation:
Dept. of Metallurgical Engineering, ESIQIE-IPN, AP 75–874, Mexico, D.F., MEXICO
M. A. Valenzuela
Affiliation:
Dept. of Chemical Engineering, ESIQIE-IPN, 07738, Mexico, D.F., MEXICO
D. R. Acosta
Affiliation:
Instituto de Física. UNAM., A.p. 20–364 Mexico, D.F., 01000, MEXICO
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Abstract

An horizontal hot-wall MOCVD reactor was used to prepare palladium and platinum catalysts supported on alumina. A conventional impregnated Pt on alumina catalyst was prepared as comparison. The solids were characterized by XRD, Auger spectroscopy, HREM and H2 -TPR. The operation conditions of the MOCVD reactor were fixed preparing several Pd catalysts until to find the appropriate deposition zone. The particle size of Pt catalysts prepared by MOCVD was at about 7 nm compared with 6 ran obtained with the Pt impregnated catalyst, measured by XRD. The HREM image of the Pt MOCVD catalyst showed a narrower particle size ranging from 1 to 4 nm. After calcination three Pt compounds were detected by TPR, which were attributed to PtO, PtO2 and Pt-Al2O3 interaction in MOCVD preparation. Additionally, a clear reduction of surface oxygens of alumina was also observed.

Keywords

MOCVDPt catalysts on aluminaXRDAuger spectroscopyHREMTPR
Type
Research Article
Information
MRS Online Proceedings Library (OPL) , Volume 497: Symposium Z – Recent Advances in Catalytic Materials , 1997 , 87
Copyright
Copyright © Materials Research Society 1998

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References

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