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Preparation Of Pt/Al2O3 Catalysts BySol-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 followingsteps: (1) preparation of alumina sols by extraction of nitrates withPrimene JMT from aluminium nitrate solution, (2) gelation to sphericalparticles (with diameter < 100 μm) by extraction of water from solemulsion 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 specificsurface area >100 m2/g at 500°C . The powders were thenimpregnated with chloroplatinic acid and recalcined at 500°C. Catalysts werealso prepared by direct gelation of alumina sol containing hydroplatinicacid followed by steps (3) and (4). Pt/Al2O3 catalystswere used for reduction of 1M UO2(NO3-0.5M HCOOHsolution with hydrogen at atmospheric pressure. The course of the reductionwas controlled analytically and by measuring the U(VI)/U(IV) redoxpotential. It was concluded that the catalysts obtained by impregnation ofsupports prepared from nitrate stabilized gels exhibit the best activity andstability.

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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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