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,
    Surface hydrophobicity and catalytic performance of cerium incorporated HZSM-5 zeolite for conversion of bio-ethanol
    (2024-05-01)
    Ausavasukhi, Artit
    ;
    Sooknoi, Tawan
    Cerium incorporated HZSM-5 (CeHZSM-5) catalyst prepared by impregnation method was tested for aqueous ethanol conversion at 200–400 °C. The CeHZSM-5 catalyst was found to be very active (21.02 %Conversion), compared to the parent HZSM-5 catalyst (9.39 %Conversion), especially at low reaction temperatures (200 °C) and when fed with high water content (80 wt% ethanol). FTIR, FT-Raman, DR-UV, NH<inf>3</inf>-TPD, IPA-TPD, DSC and contact angle techniques reveal that the incorporation of cerium species into zeolites results in the acidity and hydrophilic/hydrophobic nature. Cerium species are thought to tend to migrate into ZSM-5 channels and associate with the zeolite framework. As a result, the net electrostatic charge decreases due to the presence of tetrahedral cerium atoms. Therefore, the CeHZSM-5 exhibits a hydrophobic character, compared to the parent one. The decrease in competitive adsorption of water versus ethanol feed at the Brønsted acid site may lead to an increase in CeHZSM-5 catalyst activity.
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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.