Abstract
The kinetics of catalytic reduction of Np(V) with formic acid in HClO4 solutions in the presence of Pd/SiO2 catalysts differing in the Pd content and size of Pd nanocrystals was studied. The reaction is a structure-insenitive catalytic process, i.e., the size effect is absent. An increase in the percentage of Pd on SiO2 leads to a decrease in the activity of the catalysis centers due to a considerable increase in the contribution of the side reaction catalytic decomposition of HCOOH with an increase in the number of active centers in the catalyst grain. The effect of the S:L ratio, concentrations of HCOOH and HClO4, and temperature on the rate of catalytic reduction of Np(V) in the presence of palladium catalysts was examined. The suggested mechanism of the catalytic reduction of Np(V) with formic acid in the presence of Pd/SiO2 involves a slow step of decomposition of the protonated species NpO2H, formed by the reaction of the NpO 2 + ion with chemisorbed hydrogen atoms Pd(H).
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