不同载体负载Cu催化剂上甘油氢解制1,2-丙二醇催化性能的研究

采用等体积浸渍法合成了一系列不同载体负载的Cu基催化剂,并研究了其在甘油氢解反应中的催化性能。借助X射线衍射(XRD)、程序升温还原(H₂-TPR)和氨气程序升温脱附(NH₃-TPD)等手段对催化剂进行了表征,同时考察了反应温度、反应压力、反应时间和催化剂重复使用次数对其催化性能的影响。结果表明,载体对催化剂反应性能影响较大,且甘油氢解反应需要适当的酸性;当在催化剂8Cu/γ-Al₂O₃用量为反应原料质量的2.5%、反应温度513 K、反应压力6 MPa、反应时间6 h、反应原料为质量分数为10%的甘油水溶液的条件下,其催化效果最优,甘油转化率最高为88.4%,1,2-丙二醇的选择性可达到86.2%,且催化剂显示了良好的稳定性。

Hydrogenolysis of glycerol to 1,2-propanediol over various supported Cu catalysts

Supported Cu catalysts were prepared by wetness impregnation method and used in the hydrogenolysis of glycerol to l,2-propanediol.The catalysts were characterized by means of XRD,H2-TPR and NH3-TPD and the influence of temperature,pressure,reaction time and catalyst reusing on its catalytic activity in glycerol hydrogenolysis was investigated.The results showed that the catalytic activity is strongly dependent on the support and proper acidity is essential for the hydrogenolysis.8Cu/γ-Al2O3 catalyst exhibits high activity and stability;after reaction over it for 6 h under the optimal reaction conditions of 513K,6 MPa,catalyst amount of 2.5 %,with 10 % glycerol aqueous solution as feed,the conversion of glycerol and the selectivity to 1,2-propanediol reach 88.4% and 86.2%,respectively.