CATALYSTS FOR LOW-TEMPERATURE OXIDATION OF CUMENE BASED ON CARBON CARRIERS
This paper deals with investigation of the catalytic activity of metal-carbon carrier composite materials based on various kinds of carbon (carbon nanotubes, carbon black, Sibunit carbon-carbon material, etc.) and metals (Ag, Ni, Co, etc.) in the reaction of cumene oxidation with molecular oxygen. The oxidation of cumene 60?°С temperature and atmospheric pressure, without catalyst and initiator are not substantially (even trace amounts no reaction products), i.e. thermal oxidation does not exert its influence on the kinetics of catalytic oxidation, and probably carried nucleation radicals on the catalyst surface, which is both an initiator of the process, the oxidation and generally passes through a heterogeneous-homogeneous mechanism. It is shown that the use of Ag-carbon carrier composite material as a cumene oxidation catalyst allows one to achieve a significant decrease in temperature (to 40?°C) and an increase in selectivity to cumene hydroperoxide. When using catalysts including variable-valence metals, a decomposition of hydroperoxide occurs via the Haber-Weiss mechanism and a decrease in the selectivity to hydroperoxide is observed.