Numwong, Natthida

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Numwong, Natthida
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natthida.nu@kmitl.ac.th

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    Effects of synthetic conditions on the Pd particle sizes of Pd/SBA-15 catalysts and their performance for the partial hydrogenation of biodiesel fuels
    (2024-07-01)
    Supabunnapong, Thanadon
    ;
    Rungsi, Artita Na
    ;
    Luengnaruemitchai, Apanee
    ;
    Chen, Shih Yuan
    ;
    Mochizuki, Takehisa
    Mesoporous silica (SBA-15)-supported Pd catalysts (Pd/SBA-15) with Pd particles of various sizes (4–17 nm) were obtained under different calcination conditions. These purpose-made Pd/SBA-15 catalysts are applied in the partial hydrogenation of soybean-oil-derived biodiesel fuel, rich in polyunsaturated fatty acid methyl esters (poly-FAME), to produce partially hydrogenated fatty acid methyl esters (H-FAME), rich in monounsaturated fatty acid methyl esters (mono-FAME), under mild conditions (80 °C, 0.5 MPa H<inf>2</inf>). The Pd particle size was strongly correlated with hydrogenation rate and selectivity, thereby influencing the composition and fuel properties of H-FAME. The Pd/SBA-15 catalyst with a Pd particle size of approximately 4 nm obtained by calcination at 300 °C in O<inf>2</inf> showed the highest initial hydrogenation rate and mono-FAME selectivity. The resulting H-FAME product was rich in mono-FAME and thus exhibited high oxidative stability and cold-flow properties compliant with high-blend biofuel standards. In contrast, the analog catalysts with Pd particle sizes ranging from 8 to 17 nm obtained by calcination at 300 °C in air and nitrogen and at 500 °C featured lower hydrogenation rates and afforded larger amounts of undesired saturated fatty acid methyl esters. These findings shed light on the effect of the Pd particle size on the hydrogenation of biodiesel and can be readily applied to the hydrogenation of other biofuels.
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    Influence of Mg modifier on cis-trans selectivity in partial hydrogenation of biodiesel using different metal types
    (2016-06-25)
    Thunyaratchatanon, Chachchaya
    ;
    Jitjamnong, Jakkapong
    ;
    Luengnaruemitchai, Apanee
    ;
    Numwong, Natthida
    ;
    Chollacoop, Nuwong
    The catalytic performance of Pd, Pt, and Ni supported on catalysts was investigated for partial hydrogenation of soybean methyl esters, in terms of FAME composition and biodiesel properties, especially oxidative stability and cold flow properties. The effect of Mg modifier over SiO-supported catalysts on cis-trans selectivity of polyunsaturated FAMEs was also examined. The catalytic testing was performed under reaction conditions of 4 bar hydrogen pressure and 80-120 °C. Hydrogenation activity was presented by turnover frequency (TOF) of diunsaturated fatty acid (C18:2) within 4 h of the reaction time. The highest TOF was obtained over Pd catalysts, while the lowest TOF was obtained from Ni catalysts. At high reaction temperature conditions showed a large amount of cis-monounsaturated fatty acid (cis-C18:1); however, it exhibited a large amount of trans-monounsaturated fatty acid (trans-C18:1) which has a negative impact on biodiesel properties. The XPS revealed that the introduction of Mg leads to a strong metal-support interaction caused by electron transfer from the support to the metal, which decreased trans-C18:1 formation and presented the higher oxidative stability than the catalysts without Mg modifier.