Bi-Pt催化剂在H-mordenite载体上的甘油选择性氧化

Selective oxidation of glycerol over Bi-Pt catalyst on H-mordenite

摘要: 以Bi-Pt/H-mordenite为催化剂,对甘油(GLY, Glycerol)选择性氧化制备二羟基丙酮(DHA, Dihydroxyacetone)进行了研究。采用BET对催化剂进行表征,结果表明,催化剂的比表面积对催化剂的反应性能影响较小。甘油的裂解是主要的副反应,而H-mordenite可以抑制甘油的裂解,提高DHA的选择性。最佳反应条件为温度353 K,反应时间2~4 h,空气流量20 mL/min,甘油(水-乙醇1:1混合溶液的质量分数为10%),催化剂为1%Bi-5%Pt/H-mordenite时,甘油的转化率为70.6%,DHA的选择性为61.0%。

Abstract: Selective oxidation of glycerol (GLY) to dihydroxyacetone (DHA) was studied over Bi-Pt/H-mordenite catalyst. The results indicated that the surface area has little effect on the performance of the supported catalysts. H-mordenite as support inhibits the cracking of GLY and thus promotes the selectivity to DHA. Protic solvents such as ethanol and water favor the formation of DNA from GLY. Over the Bi-Pt/H-mordenite catalyst of optimum composition (1% Bi and 5% Pt by weight) and under the optimum reaction conditions (353 K, reaction time of 2~4 h, air flow rate of 20 mL/min, and GLY concentration of 10%), the conversion of GLY and selectivity to DHA reach 70.6% and 61.0%, respectively.