Computer Science
Scientific paper
Nov 1984
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1984gecoa..48.2321n&link_type=abstract
Geochimica et Cosmochimica Acta, vol. 48, Issue 11, pp.2321-2329
Computer Science
5
Scientific paper
Interactions between lignite and soluble uranyl species have been investigated experimentally at different temperatures from 20° to 400°C. Fixation of uranyl species by lignite (45° to 250°C) and their reduction to uraninite (120° to 400°C) were observed. The fixation of uranyl species by lignite results in the formation of stable organo-uranyl compounds. The reduction of uranyl species by lignite results in a stoichiometric liberation of H + in the solution medium and in a dehydrogenation of lignite. This dehydrogenation can be attributed to two different processes. The first is an oxidation of alcohol functional groups into aldehyde or ketone functions accompanied by a simultaneous reduction of uranyl species. The second is a dehydrogenation of hydrocarbonaceous aliphatic moieties induced by the uranium species. The molecular hydrogen produced during this process is subsequently used for an additional reduction of uranyl species.
Disnar J.-R.
Nakashima Shin-ichi
Perruchot A.
Trichet J.
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