The Influence of Different Morphologies of Black TiO₂ Supported Pt Catalysts on the Catalytic Oxidation of Glycerol

The increased production of biodiesel has resulted in a corresponding rise in glycerol (GLY) production. The glycerol oxidation reaction is characterized by mild reaction conditions and relatively simple products, making it a widely utilized method for glycerol conversion and one of the most promising industrial approaches. In this study, we prepared black titanium dioxide-supported platinum catalysts with different morphology. Different catalysts were synthesized by altering the morphology of the support and the reduction temperature of the support, which exhibited distinct activities and performance in the catalytic oxidation of glycerol to glyceric acid under alkali-free conditions. The evaluation of the catalysts revealed that when flaky black titanium dioxide (F-B-TiO₂) is employed as a support, the catalyst Pt/F-B-TiO₂ (600 °C), reduced at 600 °C, demonstrates the best catalytic performance. Characterization results indicate that the Ti³⁺ content in the flaky (F-B-TiO₂) support is higher compared to other morphologies. Additionally, at a calcination temperature of 600 °C, the Pt° content is maximized among the synthesized catalysts. Based on the experimental and characterization results, the catalytic performance is collaboratively influenced by the presence of Ti³⁺ and Pt⁰.