Catalytic Decomposition of H_2O_2 over Supported ZnO

摘要

Transition metal sulfates of Cu(II), Co(II), Ni(II), Cr(ILI. Mn H - ~ FexUll supported on ZnO were prepared and characterized by SEM, EDX, and XRD. Th~ kinen~s of heterogeneous decomposition of H202 over these supported catalysts was mx e~tigared The re~ rate is correlated with both the amount of supported metal ion and its redox p~z~tenu~1 The r~ reaction increases with increasing initial concentration of ~ attains a maximum. ami thereafter. It also increases with pH and reaches a maximum at high pH values. A reacuon n~. is proposed that implies the formation of a peroxo intermediate at the early staoes ~f he ~ A second intermediate is assumed to be formed at high [H202]0 which inhibitx the pn3~ ~# reaction.