Recycling of waste glycerol derived from biodiesel production to high value-added chemicals is essential for sustainable development of Bio-Circular-Green Economy. This work studied the conversion of glycerol to 1,3-propanediol over Pt/WO_x/Al₂O₃ catalysts, pointing out the impacts of catalyst pore sizes and operating conditions for maximizing the yield of 1,3-propanediol. The results suggested that both pore confinement effect and number of available reactive metals as well as operating conditions determined the glycerol conversion and 1,3-propanediol selectivity. The small-pore 5Pt/WO_x/S-Al₂O₃ catalyst (6.1 nm) gave a higher Pt dispersion (32.0%), a smaller Pt crystallite size (3.5 nm) and a higher number of acidity (0.47 mmol NH₃ g^-1) compared to those of the large-pore 5Pt/WO_x/L-Al₂O₃ catalyst (40.3 nm). However, glycerol conversion and 1,3-propanediol yield over the small-pore 5Pt/WO_x/S-Al₂O₃ catalyst were significantly lower than those of the large-pore Pt/WO_x/L-Al₂O₃ catalyst, suggesting that the diffusional restriction within the small-pore catalyst suppressed transportation of molecules to expose catalytic active sites, favoring the excessive hydrogenolysis of 1,3-propanediol, giving rise to undesirable products. The best 1,3-propanediol yield of 32.8% at 78% glycerol conversion were achieved over the 5Pt/WO_x/L-Al₂O₃ under optimal reaction condition of 220 ^oC, 6 MPa, 5 h reaction time and amount of catalyst to glycerol ratio of 0.25 g mL^-1. However, the 1,3-propanediol yield and glycerol conversion decreased to 19.6% and 51% after the 4^th reaction-regeneration which were attributed to the carbonaceous deposition and the agglomeration of Pt particles.

将生物柴油生产中产生的废甘油再循环为高附加值的化学品，对于生物循环绿色经济的可持续发展至关重要。这项工作研究了在Pt / WO _x / Al ₂ O ₃催化剂上甘油向1,3-丙二醇的转化，指出了催化剂孔径和操作条件对1,3-丙二醇最大产率的影响。结果表明，孔的封闭作用和可用的反应性金属的数量以及操作条件决定了甘油的转化率和1,3-丙二醇的选择性。小孔5Pt / WO _x / S-Al ₂ O ₃催化剂（6.1 nm）与大孔5Pt / WO相比，具有较高的Pt分散度（32.0％），较小的Pt晶粒尺寸（3.5 nm）和较高的酸度（0.47 mmol NH ₃ g ^-1）。_x / L-Al ₂ O ₃催化剂（40.3nm）。然而，小孔5Pt / WO _x / S-Al ₂ O ₃催化剂的甘油转化率和1,3-丙二醇产率显着低于大孔Pt / WO _x / L-Al ₂ O ₃催化剂。催化剂，表明在小孔催化剂内的扩散限制抑制了分子​​的运输以暴露催化活性位点，有利于1，3-丙二醇的过度氢解，产生了不希望的产物。在最佳反应条件为220 ^o C，6 MPa，5 h反应时间和5h的最佳反应条件下，在5Pt / WO _x / L-Al ₂ O _3上，在78％的甘油转化率下，最佳的1,3-丙二醇产率为32.8％。催化剂与甘油的比例为0.25 g mL ^-1。然而，1,3-丙二醇的产量和甘油转化率降低至19.6％和51％的4后^第 反应的再生归因于碳质沉积和Pt颗粒的团聚。