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Author: search.filters.author.Huang, Ai LinSubject: search.filters.subject.Fatty acid Methyl esters

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    Tuning Cu+ species/Brønsted acids of copper phyllosilicate by K+ doping for selective hydrogenation of methyl palmitate to hexadecanol
    (2023-12-01)
    Prasanseang, Warot
    ;
    Choojun, Kittisak
    ;
    Poo-arporn, Yingyot
    ;
    Huang, Ai Lin
    ;
    Lin, Yu Chuan
    Selective hydrogenation of methyl palmitate to hexadecanol can be manipulated by tuning Cu<sup>+</sup> species and Brønsted acid sites (BAS) of copper phyllosilicate (CuPS) catalysts with K<sup>+</sup> doping. The catalysts were prepared by impregnating K<sup>+</sup> onto reduced and non-reduced CuPS. The reactions were carried out in a fixed-bed flow reactor at 250 °C under atmospheric H<inf>2</inf>. In situ TR-XANES and Py-IR suggest that the presence of K<sup>+</sup> could stabilize Cu<sup>+</sup> species and neutralize BAS. As compared to the non-reduced sample, K<sup>+</sup> loading (0.01–0.10 wt%) on the reduced CuPS provide higher Cu<sup>+</sup> fraction (10–16%), lower BAS (0.82 to 0.16μ mol/g) and lower Cu dispersion (75 to 52%). A balance between Cu<sup>0</sup> active surface and Cu<sup>+</sup> content provides an optimum hydrogenation activity (up to 80 %). The increased Cu<sup>+</sup> species, together with the decreased BAS, does not only enhance the catalyst stability, but also hexadecanol selectivity (from 35 to 60%, at ∼50% conversion).