Cationic Latexes with Bound Cobalt Phthalocyaninetetrasulfonate Catalyze Autoxidation of 1-Decanethiol

摘要

The activity of heterogeneous catalysts normally increases as the catalyst particle size decreases because surface area per unit is inversely related to particle diameter. We report that a 60-nm diameter cationic latex with bond cobalt phthalocyaninetetrasulfonate (CoPcTs) is 11 times more active than soluble CoPcTsNa4 for autoxidation of 1-decanethiol in water. Previously CoPcTs bound to soluble polymers has shown greater activity than CoPcTsNa4 for autoxidation of 2-mercaptoethanol. CoPcTs bound to Sephadex ion-exchange resins was less active than soluble CoPcTsNa4 for autoxidations of 2-mercaptoethanol and 1-butanethiol in aqueous and nonaqueous media. Autoxidation of thiols is important in industry for the removal of thiol odors (such as the 'sweetening' of petroleum) and in living organisms (such as for changes in protein structure). (MJM)