Abstract
Alteration of adsorption properties and porous structure (texture) of the KNaLSX zeolite at the initial stages of its destruction during ion-exchange modification in solutions of NH4Cl and thermal shock under vacuum degassing has been studied. Transmission electron microscopy, X-ray diffraction, low-temperature nitrogen adsorption and adsorption of CO2 and CH4 at 273 K were applied for characterization of the obtained materials. Conversion of the predominantly microporous material to the material with threemode pore-size distribution is shown. Significant fraction of the faujasite phase and corresponding micropores are preserved in the material. This is accompanied with formation of pores of two types: quasi-spherical mesopores with the characteristic size of 5 nm and the meso-macropores with typical size exceeding 40 nm. Basing on the obtained results, a mechanism of textural changes in the LSX zeolite treated under applied conditions is proposed.
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Original Russian Text © A.A. Leonova, A.B. Ayupov, V.B. Fenelonov, M.S. Mel’gunov, 2017, published in Fizikokhimiya Poverkhnosti i Zashchita Materialov, 2017, Vol. 53, No. 6, pp. 586–591.
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Leonova, A.A., Ayupov, A.B., Fenelonov, V.B. et al. Adsorption and Textural Properties of LSX Zeolite at the Initial Stages of Destruction. Prot Met Phys Chem Surf 53, 989–994 (2017). https://doi.org/10.1134/S2070205117060168
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DOI: https://doi.org/10.1134/S2070205117060168