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

A. A. Leonova, A. B. Ayupov, V. B. Fenelonov, M. S. Mel’gunov

Research output: Contribution to journalArticlepeer-review

2 Citations (Scopus)

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.

Original languageEnglish
Pages (from-to)989-994
Number of pages6
JournalProtection of Metals and Physical Chemistry of Surfaces
Volume53
Issue number6
DOIs
Publication statusPublished - 1 Nov 2017

Keywords

  • CO and CH adsorption
  • LSX zeolite
  • mechanism of mesopores’ formation
  • NaCl ion exchange
  • NHCl ion exchange

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