Deep oxidation of toluene on glass fiber catalysts in structured cartridges of various geometries

The work is devoted to the study of platinum-containing glass fiber catalysts (GFC) for the deep oxidation of hydrocarbons, which can be used in processes for purifying exhaust gases from volatile organic impurities, as well as for environmentally friendly combustion of fuels. The influence of the catalyst synthesis method on its activity in the deep oxidation of toluene was studied. The highest specific activity per unit mass of Pt is demonstrated by the traditional GFC IK-12-S102 based on a pre-leached zirconium-containing carrier, however, in terms of total activity per unit volume of the cartridge and per unit mass of the catalyst, GFC IK-12-S111, produced by the method of surface thermal synthesis, is more effective . The slightly higher platinum content in it is compensated by the possibility of using a significantly lighter, cheaper and more accessible carrier. It has been shown that applying a precursor solution to a carrier by spraying instead of impregnation provides an increase in specific activity. In addition, the influence of such properties as the structure of the glass fiber support (satin and openwork weaving) and the geometry of the location of the catalyst layers relative to the flow of the reaction mixture on the observed activity of the GFC was studied. It has been shown that the most effective for deep oxidation processes is the use of satin weaving as a carrier of the GFC, with the catalyst layers being longitudinally oriented relative to the flow of the reaction mixture. Criterion equations are proposed for assessing the hydraulic resistance of various types of GFC packages.

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