Abstract
Gold-ceria composites (СеО2)Au and (Au)CeO2 which exhibited catalase activity towards H2O2 decomposition in an aqueous medium depending on their preparation conditions were formed in two stages in situ. In the presence of hydrazine dihydrochloride both the probability of the ceria formation and the catalase activity of (СеО2)Au were found to decrease. The catalase activity was at a maximum for (СеО2)Au when the gold nanoparticles were formed in the 1.0 mM HAuCl4 medium and for (Au)CeO2 when they were synthesized in 0.5–0.75 mM HAuCl4 and 1.0 mM Na3C6H5O7. Boiling (СеО2)Au and (Au)CeO2 composites at ~80 kPa reduced their capacity to decompose H2O2.
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