PREPARATION AND PROTECTIVE PROPERTIES OF A CATALYST FOR THE OXIDATION OF CARBON MONOXIDE BY AIR OXYGEN BASED ON Pd(II), Cu(II) COMPOUNDS AND CARBON FIBER MATERIAL

Ensuring reliable protection of the respiratory organs of the workers in various industries from carbon monoxide is a complex and multifaceted task. In order to solve a number of issues, it is necessary to carry out research aimed at the development of appropriate catalysts, their optimization, and, taking into account the operational characteristics of catalysts, develop recommendations for their use in the means of individual protection of respiratory organs. The work is devoted to the synthesis method optimization and the operational characteristics determination of the catalyst for the oxidation of carbon monoxide with air oxygen, which includes compounds of palladium(II), copper(II), and two batches of non-woven carbon fiber material Karbopon B-Active-200-65-A were used as a carrier (CFM-I and CFM-II), with hydrated cellulose as the precursor. The CFM carrier weighing 0.5–2.5 g was pre-dried at t = 110 °С to a constant weight and impregnated according to moisture content with a water-alcohol solution containing palladium and cuprum precursors in the given ratios in the form of K2PdCl4, Cu(NO3)2 and auxiliary component KBr. The ratio of the solid phase to the liquid phase is 1:10. The wet mass was kept in a closed Petri dish at 20–25 °С for 20–24 hours, then dried in a thermal cabinet in an air environment at 110 °С to a constant mass. Samples were cooled in a desiccator to room temperature. Testing of catalysts of the composition K2PdCl4–Cu(NO3)2–KBr/CFM was carried out in a flow-through gas thermostated at 293 K installation with an “allonge” type reactor with a fixed catalyst layer. The dimensions of the reactor and the speed of the gas-air mixture correspond to the regime of ideal compression and the course of the reaction in the kinetic region. The method of obtaining was optimized and the operational characteristics of the catalyst for the oxidation of carbon monoxide by air oxygen, which includes compounds of palladium (II), copper (II) and carbon fiber material, were determined. As a result of testing catalyst samples based on CFM-I and CFM-II in the carbon monoxide oxidation reaction, it was established that despite a more developed structure, the catalyst based on CFM-II is less active than the catalyst based on CFM-I; the degree of CO conversion increases with an increase in the effective contact time. The catalyst based on CFM-II at τeff = 0.45 sec in the region of CinCO from 50 to 300 mg/m3 provides stable air purification from CO much lower than MPCCO (20 mg/m3) and can be recommended for use in respiratory devices.