Thermochemistry of pure-silica zeolites

Article Abstract:

A series of pure-silica molecular sieves is examined by high temperature drop solution calorimetry using lead borate solvent at 974 K. The presence of internal silanol groups is shown to result in a slight destabilization of the calcined molecular sieves by comparing calorimetric data for MFI and BEA samples synthesized in hydroxide and fluoride media.

Zeolites, Thermal properties, Chemical synthesis

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Entropy of pure-silica molecular sieves

Article Abstract:

The entropy for a series of pure-silica molecular sieves is reported and the implications regarding the stability of SiO2 polymorphs are discussed. The study concluded that the entropy contribution to the overall thermodynamics of SiO2 phase transformations is much smaller than the enthalpy contribution.

Silicon Dioxide, Entropy (Physics), Entropy (Thermodynamics)

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In situ calorimetric, structural, and compositional study of zeolite synthesis in the system 5.15Na2O-1.00A12O3-3.28SiO2-165H20

Article Abstract:

Scanning microcalorimetry was used to study the synthesis of FAU zeolite.

Usage, Calorimetry

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