Abstract
A technique for producing mineral-carbon composite sorption-active materials based on man-made waste was developed. The pyrolysis product of used car tires serves as a filler, and the waste clay arising from excavations, as a binder employed in the production of the composite materials. The production process consists of the stages of preparation of the components, mixing, extrusion molding, and heat treatment at elevated temperatures in an inert atmosphere. The influence of the qualitative and quantitative compositions on the pore structure, as well as on the strength and sorption properties of the composite sorption-active materials, was shown. Additional introduction of 10–25% of bentonite clay possessing high plasticity leads to a >80% increase in the crushing strength of the material granule. The resultant materials predominantly exhibit well-developed mesopores whose size distribution varies depending on the composition of the material. The mesopore structure thus formed is characterized by narrow distribution of small pores in the range of 1–4 nm, approaching the upper boundary for the supermicropore size. The possibility of obtaining an air dryer, similar to commercial KG agent, on the basis of on the produced composite sorption-active materials, by impregnation with a calcium chloride solution was demonstrated. The drying capacity of the obtained air dryer with respect to water vapor was assessed. This type of materials is used for protecting hopcalite catalyst of low-temperature CO oxidation against water vapor under dynamic conditions. It was shown that the air dryer on the composite sorption-active material is not inferior in the protective properties to KG dryer and ensures effective performance of hopcalite under the specified application conditions.
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ACKNOWLEDGMENTS
The study was financially supported by the Russian Science Foundation (project no. 21-79-30029).
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Samonin, V.V., Podvyaznikov, M.L., Spiridonova, E.A. et al. Production of Composite Sorption-Active Materials Based on Carbon Black and Clay Material from Man-Made Waste. Russ J Gen Chem 93, 715–722 (2023). https://doi.org/10.1134/S1070363223030271
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DOI: https://doi.org/10.1134/S1070363223030271