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Mixed-cation LiCa-LSX zeolite with minimum lithium for air separation.
- Source :
- AIChE Journal; Feb2018, Vol. 64 Issue 2, p406-415, 10p
- Publication Year :
- 2018
-
Abstract
- The aim of this work was to reduce/minimize Li in Li-LSX by replacing the 70% Li<superscript>+</superscript> cations in Li-LSX that are bonded to the interior or inaccessible sites which are not used for adsorption. Thus, mixed-cation LiCa-LSX containing minimum lithium were prepared by exchanging small fractions of Li<superscript>+</superscript> into Ca-LSX, followed by dehydration under mild conditions to avoid migration/equilibration of Li cations. Comparisons of adsorption isotherms of N<subscript>2</subscript>/O<subscript>2</subscript> and heats of adsorption for the LiCa-LSX samples with that for pure-cation Li-LSX and Ca-LSX provided strong evidence that significant amounts of these Li cations indeed remained on the exposed sites (SIII). The mixed-cation LiCa-LSX samples were compared against the pure-cation Ca-LSX and Li-LSX based on their performance for oxygen production by PSA, via model simulation. The results showed that the mixed-cation LiCa-LSX samples yielded significantly higher O<subscript>2</subscript> product productivities at the same product purity and recovery than their pure-cation precursor (Ca-LSX). © 2017 American Institute of Chemical Engineers AIChE J, 64: 406-415, 2018 [ABSTRACT FROM AUTHOR]
Details
- Language :
- English
- ISSN :
- 00011541
- Volume :
- 64
- Issue :
- 2
- Database :
- Complementary Index
- Journal :
- AIChE Journal
- Publication Type :
- Academic Journal
- Accession number :
- 127191386
- Full Text :
- https://doi.org/10.1002/aic.16032