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<p>In this work, silica aerogel-supported ZIF-8 and a series of nickel-loaded catalysts were tested for the synthesis of glycerol carbonate from glycerol and CO<sub>2</sub> in the presence of propylene oxide. Propylene oxide was used to readily introduce CO<sub>2</sub> into the reaction medium. To the best of the authors’ knowledge, there are no studies in the literature that use silica aerogel or this type of composite as a catalyst in this reaction. Catalyst series were prepared with different ZIF-8 (5 and 15 wt%) and nickel (2, 5, and 8 wt%) compositions via a combination of sol-gel, wet impregnation, and in situ techniques. Synthesized catalysts and silica aerogel support material were characterized by FT-IR, DRIFTS, XRD, SEM-EDX, MAPPING, N<sub>2</sub> sorption, and TGA-DSC. Catalytic activity (glycerol conversion, selectivity of glycerol carbonate and propylene glycol, glycerol carbonate yield) of the catalysts was recorded at several temperatures (100, 150, 200&#xa0;°C), co-reactant amount (glycerol/propylene oxide molar ratio: 0.25, 0.50, 0.75), and catalyst loading (2, 5, 8% of glycerol weight). It was determined that high glycerol conversion (83%), yield (41%), and selectivity (50%) of glycerol carbonate for SA-5Ni-15ZIF under optimized reaction conditions (200&#xa0;°C, 7&#xa0;bar, 2&#xa0;h, 8% catalyst loading, and 0.25 glycerol/propylene oxide). High conversion and yield were observed at relatively short reaction times and CO<sub>2</sub> pressures compared to the literature.</p>

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Ni-loaded silica aerogel/ZIF-8 catalyst for transesterification of glycerol with propylene carbonate derived from propylene oxide and CO2 cycloaddition

  • 期刊论文

  • 发表日期：

    2026年3月6日

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  • Gamze Özçakır,
  • Çağlayan Açıkgöz

摘要

In this work, silica aerogel-supported ZIF-8 and a series of nickel-loaded catalysts were tested for the synthesis of glycerol carbonate from glycerol and CO2 in the presence of propylene oxide. Propylene oxide was used to readily introduce CO2 into the reaction medium. To the best of the authors’ knowledge, there are no studies in the literature that use silica aerogel or this type of composite as a catalyst in this reaction. Catalyst series were prepared with different ZIF-8 (5 and 15 wt%) and nickel (2, 5, and 8 wt%) compositions via a combination of sol-gel, wet impregnation, and in situ techniques. Synthesized catalysts and silica aerogel support material were characterized by FT-IR, DRIFTS, XRD, SEM-EDX, MAPPING, N2 sorption, and TGA-DSC. Catalytic activity (glycerol conversion, selectivity of glycerol carbonate and propylene glycol, glycerol carbonate yield) of the catalysts was recorded at several temperatures (100, 150, 200 °C), co-reactant amount (glycerol/propylene oxide molar ratio: 0.25, 0.50, 0.75), and catalyst loading (2, 5, 8% of glycerol weight). It was determined that high glycerol conversion (83%), yield (41%), and selectivity (50%) of glycerol carbonate for SA-5Ni-15ZIF under optimized reaction conditions (200 °C, 7 bar, 2 h, 8% catalyst loading, and 0.25 glycerol/propylene oxide). High conversion and yield were observed at relatively short reaction times and CO2 pressures compared to the literature.