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Preparation Of Pt/Al2O3 Catalysts By Sol-Gel Process And Its Application To Uranyl Ion Reduction

Published online by Cambridge University Press:  21 February 2011

A. Deptuia ,
W. Łada ,
T. Olczak  and
A. Di Bartolomeo
A. Deptuia
Affiliation:
Lnstitute of Nuclear Chemistry and Technology, Warsaw, Poland
W. Łada
Affiliation:
Lnstitute of Nuclear Chemistry and Technology, Warsaw, Poland
T. Olczak
Affiliation:
Lnstitute of Nuclear Chemistry and Technology, Warsaw, Poland
A. Di Bartolomeo
Affiliation:
C.R.E. Casaccia, ENEA, Rome, Italy.
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Abstract

Various kinds of active alumina supports were obtained in the following steps: (1) preparation of alumina sols by extraction of nitrates with Primene JMT from aluminium nitrate solution, (2) gelation to spherical particles (with diameter < 100 μm) by extraction of water from sol emulsion in 2-ethyl -1-hexanol, (3) sometimes conversion of NO3− stabilized gel to OH− form by reaction with ammonia, (4) calcination of gels to γ-Al2O3 with specific surface area >100 m2/g at 500°C . The powders were then impregnated with chloroplatinic acid and recalcined at 500°C. Catalysts were also prepared by direct gelation of alumina sol containing hydroplatinic acid followed by steps (3) and (4). Pt/Al2O3 catalysts were used for reduction of 1M UO2(NO3-0.5M HCOOH solution with hydrogen at atmospheric pressure. The course of the reduction was controlled analytically and by measuring the U(VI)/U(IV) redox potential. It was concluded that the catalysts obtained by impregnation of supports prepared from nitrate stabilized gels exhibit the best activity and stability.

Type
Research Article
Information
MRS Online Proceedings Library (OPL) , Volume 346: Symposium N – Better Ceramics Through Chemistry VI , 1994 , 661
Copyright
Copyright © Materials Research Society 1998

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References

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