Thermochemistry of proton containing borosilicate, aluminosilicate and gallosilicate zeolite beta

Wei Zhou, Pingping Sun, Peng Zhang, Alexandra Navrotsky

Research output: Contribution to journalArticlepeer-review

4 Scopus citations

Abstract

The thermochemistry of proton containing borosilicate, aluminosilicate and gallosilicate zeolites with beta topology (B-BEA, Al-BEA and Ga-BEA) is described. Thermogravimetry and differential scanning calorimetry on these materials indicate the substitution of Al by Ga or B in the beta framework reduces the decomposition temperature. Water adsorption calorimetry directly measured the hydration enthalpies of these samples. B-BEA and Ga-BEA have less exothermic hydration enthalpies than Al-BEA. High temperature oxide melt solution calorimetry was performed to derive the formation enthalpies of hydrated samples (8.9-18.8 kJ/mol relative to oxides on TO2 molar basis). The formation enthalpies of dehydrated phases (33.2-55.1 kJ/mol relative to oxides on TO2 molar basis) were calculated from the formation enthalpies of hydrated phases and the hydration enthalpy.

Original languageEnglish (US)
Pages (from-to)749-753
Number of pages5
JournalMicroporous and Mesoporous Materials
Volume142
Issue number2-3
DOIs
StatePublished - Jul 2011
Externally publishedYes

Keywords

  • Formation enthalpy
  • Hydration enthalpy
  • Zeolite beta

ASJC Scopus subject areas

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

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