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Author: search.filters.author.Poo-arporn, YingyotSubject: search.filters.subject.Bifunctional catalyst

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    Linear long-chain α-olefins from hydrodeoxygenation of methyl palmitate over copper phyllosilicate catalysts
    (2022-04-05)
    Prasanseang, Warot
    ;
    Choojun, Kittisak
    ;
    Poo-arporn, Yingyot
    ;
    Huang, Ai Lin
    ;
    Lin, Yu Chuan
    Copper phyllosilicate (CuPS) was used as a bifunctional catalyst for hydrodeoxygenation of methyl palmitate (MP) to produce long-chain α-olefins without the loss of carbon backbone. The CuPS catalysts were prepared by ammonia evaporation-hydrothermal method. The crystal structure, surface area, reducibility, Cu dispersion, Cu particle size and acidity of the catalysts were examined by XRD, BET, H<inf>2</inf>-TPR, TEM, NH<inf>3</inf>-TPD and Py-IR. The existence of Cu<sup>2+</sup> species (octahedral (O<inf>h</inf>)/square planar (Sq)), Cu<sup>+</sup> and Cu<sup>0</sup> upon calcination/reduction was investigated by in situ TR-XANES. The Cu dispersion was related to the Cu<sup>+</sup> fraction in CuPS, while Brønsted acid sites (BAS) depends on Cu<sup>0</sup> particles. The MP conversion to 1-hexadecene proceeds via hydrogenation-dehydration promoted by the synergy of Cu<sup>0</sup> surface and Brønsted acid sites at the interface. The α-olefin selectivity depends on a balance between Cu<sup>+</sup> and Cu loading. The 20CuPS possessing 10% Cu<sup>+</sup> fraction, provides a high conversion of 72% with 45% α-olefin selectivity.