<span style="mso-fareast-font-family: DengXian; mso-fareast-theme-font: minor-fareast; mso-fareast-language: ZH-CN;">Catalytic Performance of Metal Oxide-Based Catalysts in the Synthesis of Glycerol Carbonate: Toward Green Valorization of Glycerol
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The rising concern over carbon dioxide (CO2) emissions has led to increased research on its conversion into value-added chemicals. Glycerol carbonate (GC), a versatile and eco-friendly compound, can be synthesized via the catalytic carbonylation of glycerol with CO2. This study investigates the catalytic performance of three novel mixed metal oxide catalysts Ti-Al-Mg, Ti-Cr-Mg, and Ti-Fe-Mg, synthesized via co-precipitation. The catalysts were characterized using XRD, SEM, XPS, FTIR, TGA-DTG, and nitrogen adsorption–desorption isotherms. Among the tested systems, Ti-Al-Mg demonstrated the highest surface area, optimal porosity, and a balanced acid-base profile, resulting in superior catalytic activity. Under optimized conditions (175 °C, 10 bar CO2, 4 h), Ti-Al-Mg achieved a maximum GC yield of 36.1%, outperforming Ti-Cr-Mg and Ti-Fe-Mg. The improved performance was attributed to the synergistic effects of its physicochemical properties, including high magnesium content and lower acidity, which favored CO2 activation and glycerol conversion, while minimizing side reactions. These findings highlight the potential of tailored mixed metal oxide systems for efficient CO2 immobilization and sustainable glycerol valorization.