Pemangkin SBA-15 dengan HPW telah disintesiskan melalui kaedah sintesis langsung. Pengubahsuaian telah dibuat melalui penggabungan MgO kepada sokongan pemangkin. Pemangkin yang diubahsuai telah digunakan dalam tindak balas pengesteran antara asid laurik dan gliserol selama 6 jam pada suhu 160°C. Penukaran asid laurik yang tinggi sebanyak 88% dan hasil monolaurin sebanyak 49% telah dicapai. Keputusan ini telah dilakukan oleh pemangkin 20% -HPW-MgO-SBA-15. Pemangkin tersebut telah diambil untuk menjalankan tindak balas seterusnya yang parameter nisbah molar bahan tindak balas (gliserol kepada asid laurik) berubah. Pemangkin tersebut telah menunjukkan bahawa nisbah molar bahan tindak balas 4:1 memberikan penukaran asid laurik dan hasil monolaurin yang tertinggi. Semua pemangkin yang disintesiskan telah dihantar untuk ujian pencirian dengan menggunakan FT-IR, SEM dan EDS. MgO juga tersebar di atas sokongan pemangkin dan tidak memberi kesan yang mendalam terhadap morfologi struktur. Pertukaran dan pemilihan produk yang dikehendaki bukan sahaja dipengaruhi oleh pemangkin tetapi juga bergantung kepada parameter tindak balas.
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SBA-15 catalysts with HPW were synthesised by direct synthesis method. Modification was made by incorporation of MgO on the support of catalyst. The modified catalysts were applied in the esterification reaction between lauric acid and glycerol for 6 h at 160°C. High conversion of lauric acid at 88% and yield of monolaurin at 49% were achieved. This result was performed by catalyst 20%-HPW-MgO-SBA-15. It was taken for subsequent reactions which had the parameter of reactant molar ratio (glycerol to lauric acid) changed. It was shown that reactant molar ratio of 4:1 gave the highest conversion of lauric acid and yield of monolaurin. All the catalysts synthesised were sent for characterization tests by using FT-IR, SEM and EDS. MgO was well dispersed on the support of catalyst and did not affect the structural morphology. Conversion and selectivity of the desired product were not only affected by the catalyst, they also depend on the reaction parameters.
Synthesis and characterization of modified tungstophosphoric acid MgO-SBA-15 catalyst on esterification of lauric acid and glycerol / Chan Kah Soon