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Catalytic glycerol hydrogenolysis to 1,3-propanediol in a gas–solid fluidized bed

机译:气固流化床中催化甘油氢解为1,3-丙二醇

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Glycerol is a potential feedstock to produce 1,3-propanediol (1,3-PDO), which is a valuable commercial polyester monomer. Here, we report the gas-phase glycerol hydrogenolysis to 1,3-propanediol over Pt/WO3/Al2O3 in a fluidized bed operating above 240 °C and at ambient pressure. Fluidized beds are ideal contactors for this reaction because the heat transfer rates are sufficiently high to vaporize glycerol thereby minimizing its combustion and thermal degradation. The yield of 1,3-PDO approached 14% after 2 h at 260 °C. The major co-products were 1,2-PDO (18%), 1-propanol (28%) and 2-propanol (15%). In the first step, glycerol may dehydrate to acrolein, followed by rehydration to 3-hydroxypropanal and then hydrogenation to 1,3-PDO. The concentrations of the by-products including acrolein, ethylene glycol, propane, and acetone increased with increasing temperature.
机译:甘油是生产1,3-丙二醇(1,3-PDO)的潜​​在原料,这是一种有价值的商业聚酯单体。在这里,我们报告了在Pt / WO 3 / small> Al 2 上气相甘油氢解为1,3-丙二醇small> O 3 在流化床中,高于240°C且在环境压力下运行。流化床是该反应的理想接触器,因为传热速率足够高,可以蒸发甘油,从而将其燃烧和热降解降至最低。 260°C下2 h后1,3-PDO的收率接近14%。主要副产物为1,2-PDO(18%),1-丙醇(28%)和2-丙醇(15%)。在第一步中,甘油可脱水成丙烯醛,然后再水合成3-羟基丙醛,然后加氢成1,3-PDO。副产物包括丙烯醛,乙二醇,丙烷和丙酮的浓度随温度升高而增加。

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