Catalytic transfer hydrogenolysis of glycerol can give 1,2-propanediol under mild condition (200 °C) in the absence of external H₂. Most existing studies have been focused on metallic catalysts for tandem H₂ generation and hydrogenolysis. In this work, a series of bimetallic PtPd/C catalysts with PdC_x as promoting role, were synthesized with different calcination temperatures (300–900 °C) and varied Pt/Pd molar ratio (Pd/Pt: 0.5–2.0), to investigate the structure-activity relationship over the in-situ transfer hydrogenation of glycerol. In particular, PtPd/C-900 catalysts showed the best performance (TOF: 37.6 h⁻¹, 1,2-PDO selectivity: 45.3%). It is evidenced that varied metal particle sizes (2.6–7.0 nm) were obtained, and catalytic transfer hydrogenolysis of glycerol displayed size sensitivity over PtPd/C catalysts. Besides, strong metal-support interaction can promote the formation of palladium carbide (PdC_x), thus changing the electronic structure of Pt atoms, and improving the activity of hydrogenation reaction and WGS + Reforming reaction. This study will provide insights for the structural design of catalyst for selective transfer hydrogenation of bio-polyols.

_{在没有外部H 2}的温和条件下（200℃），甘油的催化转移氢解可以得到1,2-丙二醇。大多数现有研究都集中在用于串联H ₂生成和氢解的金属催化剂上。在这项工作中，在不同的煅烧温度（300-900 ℃）和不同的 Pt/Pd 摩尔比（Pd/Pt：0.5-2.0）下合成了一系列以 PdC _x为促进作用的双金​​属 PtPd/C 催化剂，以达到研究甘油原位转移氢化的构效关系。特别是 PtPd/C-900 催化剂表现出最佳性能（TOF：37.6 h ^-1, 1,2-PDO 选择性：45.3%)。有证据表明，获得了不同的金属颗粒尺寸（2.6-7.0 nm），并且甘油的催化转移氢解在 PtPd/C 催化剂上表现出尺寸敏感性。此外，金属-载体的强相互作用可以促进碳化钯（PdC _x）的形成，从而改变Pt原子的电子结构，提高加氢反应和WGS+重整反应的活性。该研究将为生物多元醇选择性转移氢化催化剂的结构设计提供见解。