An in situ calorimetric study of zeolite crystallization kinetics

Sanyuan Yang, Alexandra Navrotsky

Research output: Contribution to journalArticlepeer-review

24 Scopus citations

Abstract

In this in situ calorimetric method the reaction rate is derived from the rate of evolution of the heat of reaction. The rationale and the procedure to obtain the reaction rate from the recorded heat flow during crystallization are elucidated. One major advantage of this method is the continous and accurate measurement of crystallization rates over a wide range of crystallinity. In contrast, other methods like XRD and microscopy, directly measure the mass (or volume) of the product, but not the reaction rate, at a few times and only an average crystallization rate is usually computed. Other features of the in situ calorimetric method are also discussed. A case of the crystallization kinetics of FAU zeolite is reported. The Arrhenius activation energy for crystallization increases from 66 ± 2.3 to 72 ± 0.8 kJ/mol as the crystallization proceeds from ∼5% to ∼75%. This change can be correlated to the increase of the Si/Al ratio in the solution, indicating that Al-rich aluminosilicate nutrient species are more reactive in the crystal growth.

Original languageEnglish (US)
Pages (from-to)93-103
Number of pages11
JournalMicroporous and Mesoporous Materials
Volume52
Issue number2
DOIs
StatePublished - Apr 2002

Keywords

  • Activation energy
  • Calorimetry
  • DSC
  • FAU zeolite
  • Kinetics
  • Zeolite synthesis

ASJC Scopus subject areas

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

Fingerprint Dive into the research topics of 'An in situ calorimetric study of zeolite crystallization kinetics'. Together they form a unique fingerprint.

Cite this