Sooknoi, Tawan

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Sooknoi, Tawan
Alternative Name
Sooknoi, T.
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Email
tawan.so@kmitl.ac.th

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    Item type:Publication,
    Hydrothermal sulfonation of palm kernel shells to produce a carbon-based solid acid catalyst for the glycerol etherification
    (2025-04-01)
    Ausavasukhi, Artit
    ;
    Sooknoi, Tawan
    Carbon-based solid acid catalysts were successfully prepared by one-step hydrothermal sulfonation of palm kernel shells. Among the solid acids studied, the catalysts with acidity and hydrophobic/hydrophilic balance were found to be more selective and efficient catalytic systems for the conversion of glycerol to glycerol ethers. The stability of the carbon-based solid acid catalyst was confirmed by a regeneration test, which showed that no leaching of acid groups into solution occurs. In addition, the carbon-based solid acid catalyst prepared by one-step hydrothermal sulfonation at 160 °C exhibits good cyclability. The etherification of glycerol with tertiary butanol occurs in a truly heterogeneous process in the presence of such an acid carbon.
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    Water-tolerant cerium-modified zeolite catalyst for glycerol etherification
    (2026-02-01)
    Ausavasukhi, Artit
    ;
    Thainoi, Suwimon
    ;
    Krukrathok, Nattanitcha
    ;
    Sooknoi, Tawan
    The transformation of glycerol into alkyl ethers, which are utilized as oxygenated fuel additives, is the main topic of this study. Zeolite and cerium-modified zeolite catalysts were prepared and characterized, then evaluated for their efficacy in the etherification of glycerol with tertiary butanol. In comparison to the parent HBeta catalyst, the cerium-modified HBeta catalyst (CeHBeta), which was prepared by impregnation, demonstrated high catalytic performance in glycerol etherification, particularly at lower reaction temperatures. The cerium species can be present as charge-balancing cations and inserted into the framework. CeHBeta is therefore hydrophobic, unlike the parent catalyst. The CeHBeta catalyst may become more active if the water molecules preferentially occupying the Brønsted acid sites are reduced. While Brønsted acid sites are indispensable for the reaction, a synergistic effect with surface hydrophobicity significantly enhances catalytic performance, with CeHBeta exhibiting superior activity. Furthermore, the experiments show that a higher reaction time, molar ratio of glycerol to alcohol, reaction temperature and amount of catalyst lead to a higher selectivity for di-alkyl ether and a higher glycerol conversion.