CATALYSTS BASED ON UKRAINIAN NATURAL SORBENTS FOR LOW-TEMPERATURE CARBON MONOXIDE OXIDATION MEANT FOR INDIVIDUAL RESPIRATORY PROTECTIVE DEVICES

In spite of a great number of patented formulas of catalysts for neutralization of carbon monoxide (CO) which is the most widespread atmospheric pollutant, only batch-produced hopcalite and alumina supported palladium (Pd/Al2O3) are used in practice. The named catalysts have significant defects: hopcalite is poisonable in the presence of water vapor and Pd/Al2O3 is characterized by the great content of palladium. We have found the possibility of using inexpensive Ukrainian natural sorbents differing by their mineralogical and chemical compositions, i.e. zeolites, bentonites, basalt tuffs, and disperse silicas, as supports for development and subsequent application of palladium(II) and copper(II) based catalysts for carbon monoxide oxidation. Acid-thermally modified Ukrainian sorbents have been found to be proper for obtaining supported copper-palladium complexes the most catalytically active in the reaction. Application of Ukrainian natural tripolis permitted to avoid the step of acid-thermal modification complicating the technique of catalyst production. As was found, the origin and phase composition of tripolis affect the activity of catalysts supported on them in the reaction of low-temperature Co oxidation. The most active catalyst permitting sanitary purification of air from CO to a level permissible for atmosphere of populated areas have been obtained in the case of insignificantly (thermally or hydrothermally) modified tripoli from Konoplianskoe deposit