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Effect of surface acidity of cyano-bridged polynuclear metal complexes on catalytic activity for hydrolysis of organophosphates

Abstract

Heterogeneous catalysis of cyano-bridged polynuclear metal complexes, which were prepared by systematic replacement of C-bound metal ions (MC) and/or N-bound metal ions (MN) of Prussian blue ([MN(H2O)x]y[FeII/III(CN)6]; MN = FeIII, GaIII, MnII, ZnII or CoII: [FeII/III(H2O)x]y[MC(CN)6]; MC = FeII, PtIV, CoIII, IrIII or RuII), was examined for hydrolysis of p-nitrophenol phosphate (p-NPP) as a model compound of insecticides. Catalytic activity of the complexes was enhanced by employing metal ions in higher oxidation states at C- and N-bound sites, although only N-bound metal ions act as active sites. The dependence of initial rates for hydrolysis on the initial concentration of p-NPP suggested that the rate determining step is the adsorption of p-NPP to catalyst surfaces. The surface acidity of each complex estimated by the heat of pyridine desorption is strongly correlated with catalytic activity.

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Publication details

The article was received on 18 May 2018, accepted on 09 Aug 2018 and first published on 09 Aug 2018


Article type: Paper
DOI: 10.1039/C8CY01015C
Citation: Catal. Sci. Technol., 2018, Accepted Manuscript
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    Effect of surface acidity of cyano-bridged polynuclear metal complexes on catalytic activity for hydrolysis of organophosphates

    H. Tabe, C. Terashima and Y. Yamada, Catal. Sci. Technol., 2018, Accepted Manuscript , DOI: 10.1039/C8CY01015C

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