Abstract
The decomposition of hydrogen peroxide in alkaline solutions on the surface of monomeric and polymeric cobalt phthalocyanines has been studied by means of volumetric, electrochemical and isotopic measurements. It has been shown that at a steady potential peroxide decomposition proceeds by the catalase mechanism and is a secondorder reaction. According to the results of18O tracer experiments, the evolving oxygen has the same isotopic composition as the initial hydrogen peroxide, the O−O bond in peroxide remaining intact during its evolution. When the steady potential is shifted in the cathodic or anodic direction, the active sites of the catalyst acquire the ability to accept or donate electrons as desired, which results in a change of the kinetic order from 2 to 1. The mechanisms of the reactions studied are considered in terms of the theory of heterogeneous catalysis on semiconductors.
Abstract
Проведено изучение разложения перекиси водорода на поверхности органических полупроводников — фталоциаников кобальта. С помощью газометрических и электрохимических измерений показано, что в этом случае реализуется электрохимический механизм реакций. При отсутствии поляризации порядок реакции по концентрации перекиси равен 2, при наложении электрохимической поляризации — уменяшается до І. Применение O18 позволило доказать, что выделяемый при этом кицлород имеет изотопный состав пе⌕екиси водорода и что связь O−O при этом не рвется.
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Tarasevich, M.R., Zakharkin, G.I. On the mechanism of hydrogen peroxide decomposition over monomeric and polymeric cobalt phthalocyanines. React Kinet Catal Lett 6, 77–82 (1977). https://doi.org/10.1007/BF02067743
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DOI: https://doi.org/10.1007/BF02067743