Thermodynamic study of alkali and alkaline-earth cation-exchanged natrolites

Lili Wu, Alexandra Navrotsky, Yongmoon Lee, Yongjae Lee

Research output: Contribution to journalArticlepeer-review

10 Scopus citations

Abstract

A series of synthetic natrolites with different non-framework cations (Li-NAT, Na-NAT, K-NAT, Rb-NAT, Cs-NAT, Ca-NAT, Sr-NAT and Pb-NAT) are investigated by high temperature oxide melt solution calorimetry. The formation enthalpy from the component oxides (ΔHf,ox) becomes less exothermic with increasing ionic potential (Z/r) of the cations. The dehydration behavior of NATs is examined using TG-DSC. The strength of water binding decreases with increasing cation size. Similar to the trend seen in anhydrous zeolites, a linear dependence of ΔHf,ox on Al/(Al + Si) ratio for hydrous zeolites is established.

Original languageEnglish (US)
Pages (from-to)221-227
Number of pages7
JournalMicroporous and Mesoporous Materials
Volume167
DOIs
StatePublished - 2013
Externally publishedYes

Keywords

  • Calorimetry
  • Enthalpy of formation
  • Ion-exchange
  • Natrolite
  • Zeolite

ASJC Scopus subject areas

  • Chemistry(all)
  • Materials Science(all)
  • Condensed Matter Physics
  • Mechanics of Materials

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