Abstract
Platinized catalysts on various types of supports were tested in the catalytic decomposition of hydrazine in HClO4 and HNO3 solutions, where the process follows different pathways. In HClO4, the activity of the catalysts supported on a Termoksid ceramic material is higher than that of the catalysts supported on amorphous silica gel. In nitric acid solutions, the trend is reverse. Peptization of the ceramic supports in acid solutions increasing in the order 75% TiO2-25% SnO2 < 75% TiO2-25% ZrO2 ≪ TiO2 < ZrO2 was observed. In perchloric acid solutions, the catalyst specific activity in the hydrazine adsorption-dissociative decomposition increases with decreasing size of platinum crystallites on the support. In nitric acid solutions, where the hydrazine decomposition proceeds as its catalytic oxidation with nitric acid, the catalyst specific activity decreases with a decrease in the size of the catalyst crystallites, i.e., the catalyst centers located on large crystallites are more active. The results obtained were attributed to the energetic heterogeneity of the surface Pt atoms and various mechanisms of the hydrazine catalytic decomposition in various media.
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Original Russian Text © A.V. Anan’ev, M.Yu. Boltoeva, L.M. Sharygin, M.S. Grigor’ev, V.P. Shilov, 2006, published in Radiokhimiya, 2006, Vol. 48, No. 2, pp. 108–112.
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Anan’ev, A.V., Boltoeva, M.Y., Sharygin, L.M. et al. Reactivity of platinum nanoaggregates on various types of supports in catalytic decomposition of hydrazine in acid solutions. Radiochemistry 48, 119–124 (2006). https://doi.org/10.1134/S1066362206020020
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DOI: https://doi.org/10.1134/S1066362206020020