Insight into the thermal decomposition of kaolinite intercalated with potassium acetate : an evolved gas analysis

Cheng, Hongfei, Li, Kuo, Liu, Qinfu, Zhang, Shuai, Li, Xiaoguang, & Frost, Ray L. (2014) Insight into the thermal decomposition of kaolinite intercalated with potassium acetate : an evolved gas analysis. Journal of Thermal Analysis and Calorimetry, 117(3), pp. 1231-1239.

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Abstract

The thermal decomposition process of kaolinite–potassium acetate intercalation complex has been studied using simultaneous thermogravimetry coupled with Fourier-transform infrared spectroscopy and mass spectrometry (TG-FTIR-MS). The results showed that the thermal decomposition of the complex took place in four temperature ranges, namely 50–100, 260–320, 320–550, and 650–780 °C. The maximal mass losses rate for the thermal decomposition of the kaolinite–potassium acetate intercalation complex was observed at 81, 296, 378, 411, 486, and 733 °C, which was attributed to (a) loss of the adsorbed water, (b) thermal decomposition of surface-adsorbed potassium acetate (KAc), (c) the loss of the water coordinated to potassium acetate in the intercalated kaolinite, (d) the thermal decomposition of intercalated KAc in the interlayer of kaolinite and the removal of inner surface hydroxyls, (e) the loss of the inner hydroxyls, and (f) the thermal decomposition of carbonate derived from the decomposition of KAc. The thermal decomposition of intercalated potassium acetate started in the range 320–550 °C accompanied by the release of water, acetone, carbon dioxide, and acetic acid. The identification of pyrolysis fragment ions provided insight into the thermal decomposition mechanism. The results showed that the main decomposition fragment ions of the kaolinite–KAc intercalation complex were water, acetone, carbon dioxide, and acetic acid. TG-FTIR-MS was demonstrated to be a powerful tool for the investigation of kaolinite intercalation complexes. It delivers a detailed insight into the thermal decomposition processes of the kaolinite intercalation complexes characterized by mass loss and the evolved gases.

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ID Code: 75551
Item Type: Journal Article
Refereed: Yes
Keywords: Kaolinite, Potassium acetate, Intercalation complex, Thermal decomposition, Evolved gas
DOI: 10.1007/s10973-014-3934-9
ISSN: 1588-2926
Subjects: Australian and New Zealand Standard Research Classification > CHEMICAL SCIENCE (030000) > PHYSICAL CHEMISTRY (INCL. STRUCTURAL) (030600) > Structural Chemistry and Spectroscopy (030606)
Divisions: Current > Schools > School of Chemistry, Physics & Mechanical Engineering
Current > QUT Faculties and Divisions > Science & Engineering Faculty
Copyright Owner: Copyright 2014 Akade´miai Kiado´, Budapest, Hungary
Deposited On: 26 Aug 2014 23:03
Last Modified: 01 Aug 2015 14:01

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