Detection of four different OH-groups in ground kaolinite with controlled-rate thermal analysis

J. Kristóf, R. L. Frost, J. T. Kloprogge, E. Horváth, E. Makó

Research output: Contribution to journalArticle

62 Citations (Scopus)

Abstract

The thermal behaviour of mechanochemically treated kaolinite has been investigated under dynamic and controlled rate thermal analysis (CRTA) conditions. Ten hours of grinding of kaolinite results in the loss of the d(001) spacing and the replacement of some 60% of the kaolinite hydroxyls with water. Kaolinite normally dehydroxylates in a single mass loss stage between 400 and 600°C. CRTA technology enables the dehydroxylation of the ground mineral to be observed in four overlapping stages at 385, 404, 420 and 433°C under quasi-isobaric condition in a self-generated atmosphere. It is proposed that mechanochemical treatment of the kaolinite causes the localization of the protons when the long range ordering is lost.

Original languageEnglish
Pages (from-to)77-83
Number of pages7
JournalJournal of Thermal Analysis and Calorimetry
Volume69
Issue number1
DOIs
Publication statusPublished - 2002

Fingerprint

Kaolin
kaolinite
Kaolinite
Thermoanalysis
thermal analysis
grinding
Hydroxyl Radical
Minerals
Protons
spacing
minerals
hydroxide ion
atmospheres
protons
Water
causes
water

Keywords

  • Controlled-rate thermal analysis (CRTA)
  • Dehydroxylation
  • Grinding
  • Kaolinite
  • Mechanochemical treatment

ASJC Scopus subject areas

  • Chemical Engineering(all)

Cite this

Detection of four different OH-groups in ground kaolinite with controlled-rate thermal analysis. / Kristóf, J.; Frost, R. L.; Kloprogge, J. T.; Horváth, E.; Makó, E.

In: Journal of Thermal Analysis and Calorimetry, Vol. 69, No. 1, 2002, p. 77-83.

Research output: Contribution to journalArticle

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