TY - JOUR

T1 - Adsorption and Textural Properties of LSX Zeolite at the Initial Stages of Destruction

AU - Leonova, A. A.

AU - Ayupov, A. B.

AU - Fenelonov, V. B.

AU - Mel’gunov, M. S.

N1 - Publisher Copyright: © 2017, Pleiades Publishing, Ltd.

PY - 2017/11/1

Y1 - 2017/11/1

N2 - 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.

AB - 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.

KW - CO and CH adsorption

KW - LSX zeolite

KW - mechanism of mesopores’ formation

KW - NaCl ion exchange

KW - NHCl ion exchange

UR - http://www.scopus.com/inward/record.url?scp=85044076312&partnerID=8YFLogxK

U2 - 10.1134/S2070205117060168

DO - 10.1134/S2070205117060168

M3 - Article

AN - SCOPUS:85044076312

VL - 53

SP - 989

EP - 994

JO - Protection of Metals and Physical Chemistry of Surfaces

JF - Protection of Metals and Physical Chemistry of Surfaces

SN - 2070-2051

IS - 6

ER -