Effect of metallic impurities on oxidation reaction of ion exchange resin. (II) Comparison of catalytic activity between six metals.:Comparison of Catalytic Activity between Six Metals

概要

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The catalytic effect of six metallic impurities on the oxidation reaction of cation exchange resin was investigated. The impurities, which were originally adsorbed onto the resin by an ion exchange method, combined with S present in the functional sulfonic acid group during heat-treatment in a nitrogen atmosphere to give the metal sulfides. The sulfides were subsequently oxidized to metal oxides. In the case of Pd2+, Cu2+, Fe2+ and Fe3+ impurities, their sulfides were easily converted into oxides, which catalyzed the resin oxidation. Their catalytic activities depended on the heat of formation of the catalyst oxides ΔH'o; the lower was ΔH'o, the more active the catalyst was. However, Co2+ and Ni2+ impurities had relatively low catalytic activities. This was because Co and Ni sulfides slowly changed into oxides, and the main chemical compositions of the impurities were not oxides but sulfides, which had no catalytic effect on the resin oxidation.
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