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<p>This research focused on the photocatalytic conversion of glycerol, a by-product of biodiesel, to lactic acid under mild conditions. For this purpose, Al<sub>2</sub>O<sub>3</sub>/nanotube-TiO<sub>2</sub> catalysts were prepared, characterized and the obtained catalysts were evaluated to investigate various reaction parameters and determine the optimum reaction conditions. The effects of catalyst reduction, oxygen presence, catalyst loading and NaOH/glycerol molar ratio were investigated to evaluate the reaction conditions. The optimum result was obtained with a NaOH/glycerol molar ratio of 4 at 90&#xa0;°C using 0.25&#xa0;g of catalyst. This reaction, carried out with a 2.5% Al<sub>2</sub>O<sub>3</sub>/nt-TiO<sub>2</sub> catalyst, resulted in a lactic acid selectivity of 97.2% and a glycerol conversion of 60.1%.</p>

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Photocatalytic lactic acid production from glycerol with Al2O3/nt-TiO2 catalysts

  • 期刊论文

  • 发表日期：

    2025年8月26日

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  • Murat Efgan Kibar,
  • Seda Aygul,
  • Meltem Yildiz

摘要

This research focused on the photocatalytic conversion of glycerol, a by-product of biodiesel, to lactic acid under mild conditions. For this purpose, Al2O3/nanotube-TiO2 catalysts were prepared, characterized and the obtained catalysts were evaluated to investigate various reaction parameters and determine the optimum reaction conditions. The effects of catalyst reduction, oxygen presence, catalyst loading and NaOH/glycerol molar ratio were investigated to evaluate the reaction conditions. The optimum result was obtained with a NaOH/glycerol molar ratio of 4 at 90 °C using 0.25 g of catalyst. This reaction, carried out with a 2.5% Al2O3/nt-TiO2 catalyst, resulted in a lactic acid selectivity of 97.2% and a glycerol conversion of 60.1%.