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

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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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Acknowledgements

The authors gratefully acknowledge the financial support provided by the National Natural Science Foundation of China (No. 51034006) and the Open Research Project of State Key Laboratory for Coal Resources and Safe Mining, China University of Mining &Technology (SKLCRSM11KFB06).

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Authors and Affiliations

  1. School of Geoscience and Surveying Engineering, China University of Mining & Technology, Beijing, 100083, People’s Republic of China

    Hongfei Cheng, Kuo Li, Qinfu Liu, Shuai Zhang & Xiaoguang Li

  2. State Key Laboratory of Coal Resources and Safe Mining, China University of Mining & Technology, Beijing, 100083, People’s Republic of China

    Hongfei Cheng

  3. School of Chemistry, Physics and Mechanical Engineering, Science and Engineering Faculty, Queensland University of Technology, 2 George Street, GPO Box 2434, Brisbane, QLD, 4001, Australia

    Hongfei Cheng & Ray L. Frost

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  1. Hongfei Cheng
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  2. Kuo Li
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  3. Qinfu Liu
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  4. Shuai Zhang
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  5. Xiaoguang Li
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Correspondence to Qinfu Liu or Ray L. Frost.

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Cheng, H., Li, K., Liu, Q. et al. Insight into the thermal decomposition of kaolinite intercalated with potassium acetate: an evolved gas analysis. J Therm Anal Calorim 117, 1231–1239 (2014). https://doi.org/10.1007/s10973-014-3934-9

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