Chemistry Journal of Moldova

CATALYTIC PROPERTY OF DOUBLE LAYERED PEROVSKITES A2MM’O6 FOR RADIOLYTICAL SPLIT OF WATER

Author(s):

Alexandru Cecal, Tudor Lupascu, Oana Roxana Hauta, Ioana Gorodea, Mircea Palamaru, Alexandra Raluca Iordan , Ada Macovei


Field: Physical chemistry and chemical physics
Type: Research paper
Issue: 2009 Volume 4, no.1
Pages: 118-122
Keywords:

catalytic effect, double perovskites, hydrogen production, water radiolysis.


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DOI:
dx.doi.org/10.19261/cjm.2009.04(1).02

Graphical Abstract:
 This paper deals with a study of water splitting by gamma rays in the presence of some double perovskites A2MM’O6 and also Sr2Fe1-xTa1+xO6. The irradiation is performed using 60Co as a source with 3·104 Ci activity and 8.3 kGy/h dose rate, which simulated the radioactive wastes, resulted from reprocessing of spent nuclear fuel elements much more active: 108-109 Ci. The stable products of radiolysis, as well as the other chemical species are measured by mass spectrometry. The calculated radiation yield (GH2) generally decreases in the order: Sr2Fe1-xTa1+xO6 (x=0.5; 0.4; 0.3; 0.1) > Ca2AlTaO6 > Sr2AlTaO6 > Ba2AlTaO6, under the given experimental conditions; the yield was higher in the presence of these catalysts than in their absence.

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