Thermochemistry of formation of ion exchanged zeolite RHO

Xin Guo, Lili Wu, David R. Corbin, Alexandra Navrotsky

Research output: Contribution to journalArticlepeer-review

6 Scopus citations

Abstract

Zeolites Na,Cs-RHO, Cd,Cs-RHO, and Li,NH4-RHO were synthesized in an aqueous ion-exchange media and studied by powder X-ray diffraction. Their thermochemistry was investigated by differential scanning calorimetry and high temperature oxide melt solution calorimetry. The formation enthalpy from binary oxide components of hydrated zeolite RHO varies linearly with the average ionic potential (Z/r) of the extra-framework cations and ranges from −34.46 ± 0.52 kJ/mol for Na,Cs-RHO to −16.75 ± 0.57 kJ/mol for Cd,Cs-RHO. The formation enthalpies for dehydrated zeolite RHO range from −25.49 ± 0.64 kJ/mol for Na,Cs-RHO to +4.12 ± 0.99 kJ/mol for Li,NH4-RHO. These values do not vary linearly with average ionic potential but do show a linear relationship with distortion parameter.

Original languageEnglish (US)
Pages (from-to)373-378
Number of pages6
JournalMicroporous and Mesoporous Materials
Volume274
DOIs
StatePublished - Jan 15 2019
Externally publishedYes

Keywords

  • Formation enthalpy
  • Hydrated and dehydrated zeolite RHO
  • Ionic potential
  • Pore size
  • Structural distortion parameter

ASJC Scopus subject areas

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

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