Exchange forms of binder-free granulated zeolites A and X: Synthesis and properties

Abstract

Samples of crystalline aluminosilicates, the granules of which are intergrowths of zeolite A and X crystals with various degrees of exchange of Na+ cations for K+, Li+, H+, Mg2+, Ca2+, and La3+ in them, have been synthesized. The influence of the chemical nature and concentration of the exchange cation on the phase composition and the characteristics of the pore structure of the zeolite granules has been studied. The equilibrium adsorption capacities for H2O vapor and CO2 of binder-free granulated zeolites A and X in the Na, K, Li, H, Ca, Mg, and La-forms have been determined, and their adsorption activities in natural gas drying and removal of H2S and CO2 impurities in the dynamic mode at 20–25°C and atmosphere pressure have been examined. The relationships between the amount of the adsorbate and the type and concentration of exchange cations in the binder-free granulated zeolites A and X have been found.