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.
This is a preview of subscription content, access via your institution.
Buy single article
Instant access to the full article PDF.
Tax calculation will be finalised during checkout.
Sol-gel Processes for Ceramic Nuclear Fuels. Proceedings of a Panel sponsored by IAEA, edited by IAEA Vienna, 6-10 May Vienna.
A. Deptula, C. Majani, Sol- gel Processes and their Applications. ENEA Report No. RT7T”IB/86/25, Roma1986.
I.P. Mc Bride, K.H. Mc Corkle, W.L. Petterson and B.C. Finney, Nuclear Technology 148, 13(1972).
B.C. Finney and P.A. Haas, ORNL Report 4802 (1972).
D. Szymanska, IBJ Report No 1397/IV/C (1972).
J.R. Anderson, Structure of Metallic Catalysts. (Academic Press, London New York, San Francisco, 1975).
A. Deptufa, J. Rebandel, W. Drozda, W. tada, T. Olczak, Production of Spherical Powders of Inorganic Compounds by Water Extraction Variant of Sol-gel Process in Better Ceramic Through Chemistry V. edited by M.J. Hampden-Smith, W.G. Klemperer and C.J. Brinker, (Mat. Res. Soc. Symp. Proc. 270, Pittsburgh, PA,1992) p. 277.
J.M. Tour, S.L. Pendalwar and J.P. Cooper, Chem. Mater. 1990.2, 647.
T. Lopez, A. Romero and R. Gómez, J. Non-Cryst. Solids,127, 105 (1990).
C. Hoang-Van, B. Pommier, R. Harivololona and P. Pichat, ibid. 145, 250 (1992).
R. Gomez, V. Berlin, M.A. Ramirez, T. Zamudio, P. Bosh, I. Shifer and T. Lopez, ibid. 147 & 148, 748 (1992).
T. López, T. López-Gaona and R. Gomez, ibid.,110, 170 (1989).
K. Maeda, F. Mizukami, M. Watanabe, N. Arai, S. Niwa, M. Toba and K. Shimizu. J. Mater. Sci. Lett. 9, 522 (1990).
T. Lopez, J. Mendez-vivar and R. Juarez, J. Non-Cryst. Solids,147 & 148, 753 (1992).
T. Lopez, L. Herrera, J. Mendez-vivar, P. Bosh, R. Gomez and R.D. Gonzalez, ibid.,147 & 148, 753(1992).
T. Lopez, M. Moran, J. Navarette, L. Herrera and R. Gomez, ibid.,147 & 148, 778 (1992).
M.N. Ramsis, E.R. Souaya, M. Abd-EI-Khalik and S.A. Selim, J. Mater. Sci. 25, 6 (1990)
About this article
Cite this article
Deptuia, A., Łada, W., Olczak, T. et al. Preparation Of Pt/Al2O3 Catalysts By Sol-Gel Process and Its Application to Uranyl Ion Reduction. MRS Online Proceedings Library 346, 661–666 (1994). https://doi.org/10.1557/PROC-346-661