Dehydrochlorination behavior of a chloride ion-intercalated hydrotalcite-like compound during thermal decomposition

Tomohito Kameda, Toshiaki Yoshioka, Kouji Watanabe, Miho Uchida, Akitsugu Okuwaki

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29 Citations (Scopus)

Abstract

We prepared a chloride ion-intercalated hydrotalcite-like compound (Cl--HT) in a co-precipitation reaction, and investigated its thermal properties using thermogravimetry-differential thermal analysis (TG-DTA) and simultaneous thermogravimetry-mass spectrometry (TG-MS). In addition, we examined the effects of temperature and atmosphere on the dehydrochlorination of Cl--HT during thermal treatment. The thermal decomposition of the Cl--HT was divided into three stages: the evaporation of surface adsorbed water and interlayer water in the Cl--HT, the dehydroxylation of the brucite-like octahedral layers in the Cl--HT, and the elimination of HCl from the Cl--HT. H2O was produced at four steps: the evaporation of surface adsorbed water and interlayer water in the first stage, two steps of H2O production caused by the dehydroxylation of the parts of Cl--HT with properties similar to Mg(OH)2 and Al(OH)3, respectively, in the second stage, and H2O production due to the dehydroxylation of the part of Cl--HT with properties similar to Al(OH)3 in the third stage. HCl was produced at two steps: the dehydrochlorination of the parts of Cl--HT with properties similar to AlOCl and Mg(OH)Cl, respectively, in the third stage. Hydrochloric acid was obtained from the Cl--HT on thermal treatment. The degree of dehydrochlorination of the Cl--HT increased with temperature. The degree was greater under water vapor than under nitrogen at all temperatures, indicating that water vapor promoted the dehydrochlorination of Cl--HT. However, the concentration of hydrochloric acid obtained under water vapor was lower than that under nitrogen.

Original languageEnglish
Pages (from-to)173-179
Number of pages7
JournalApplied Clay Science
Volume35
Issue number3-4
DOIs
Publication statusPublished - 2007 Feb

Keywords

  • Chloride ion
  • Dehydrochlorination behavior
  • Hydrochloric acid
  • Hydrotalcite-like compound
  • Intercalation
  • TG-MS

ASJC Scopus subject areas

  • Geology
  • Geochemistry and Petrology

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