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<p>Chemical, mineralogical characterization, and effect of heat treatment (25–1100&#xa0;°C) on kaolinitic material and kaolinite–DMSO intercalate, which can be used as a catalyst support/adsorbent, was studied using differential thermal analysis (DTA), thermogravimetric analysis (TGA), chemical analysis, scanning electron microscopy (SEM), Brunauer–Emmett–Teller (BET), X-ray powder diffraction (XRPD), and Fourier transform infrared spectroscopy (FTIR). It has been shown that penetration of DMSO molecules leads to increase of interlayer spaces of kaolinite from 7.18 to 11.2&#xa0;Å, which is accompanied by the formation of hydrogen bonds between DMSO and Si–O/Al–OH groups of kaolinite. During heat treatment, kaolinite–DMSO intercalate decomposes with a release and loss of H<sub>2</sub>O and afterwise DMSO molecules. It reflects recompositing stage of kaolinite with the formation of crystalline structure.</p>

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Effect of heat treatment and characterization of kaolinite–dimethylsulfoxide intercalates

  • 期刊论文

  • 发表日期：

    2025年8月25日

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  • Artur Gabrielyan,
  • Karine Grigoryan

摘要

Chemical, mineralogical characterization, and effect of heat treatment (25–1100 °C) on kaolinitic material and kaolinite–DMSO intercalate, which can be used as a catalyst support/adsorbent, was studied using differential thermal analysis (DTA), thermogravimetric analysis (TGA), chemical analysis, scanning electron microscopy (SEM), Brunauer–Emmett–Teller (BET), X-ray powder diffraction (XRPD), and Fourier transform infrared spectroscopy (FTIR). It has been shown that penetration of DMSO molecules leads to increase of interlayer spaces of kaolinite from 7.18 to 11.2 Å, which is accompanied by the formation of hydrogen bonds between DMSO and Si–O/Al–OH groups of kaolinite. During heat treatment, kaolinite–DMSO intercalate decomposes with a release and loss of H2O and afterwise DMSO molecules. It reflects recompositing stage of kaolinite with the formation of crystalline structure.