FIELD: oxidation catalysts. SUBSTANCE: catalyst is prepared by sulfuration of cobalt tetrachlorophthalocyanine by oleum in presence of boric acid on heating followed by cooling reaction mixture, treating it with oxidant, and isolating target product. According to invention, sodium nitrite is used as oxidant at its weight ratio to cobalt tetrachlorophthalocyanine 1: (0.097-0.584). EFFECT: essentially simplified procedure and reduced consumption of chemicals.
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