固体碱催化剂KF/γ-Al2O3催化合成聚甘油的研究

Synthesis of Polyglycerol Catalyzed by KF/૪-Al2O3 Solid Base

摘要:

采用不同焙烧温度和不同负载量制备了一系列KF/ ૪-Al2O3催化剂并用于甘油聚合反应，重点研究了焙烧温度和负载量对聚甘油聚合度的影响。采用XRD对固体碱的成分进行分析，用Hammett指示剂法、TG-DTA、CO2-TPD、BET等分析手段对催化剂的结构和性能进行表征。结果表明：催化剂的活性取决于其表面所含K3AlF6的量，采用焙烧温度为600℃、负载量为40%的条件所制的催化剂活性最高聚甘油的聚合度最高可达6.21。

Abstract:

A series of KF / ૪ -Al2O3 catalysts were prepared and used for glycerol polymerization. The effect of the calcination temperature and KF loading on the degree of polymerization of the polyglycerin were investigated. The structure and performance of catalysts were characterized by XRD ,Hammett indicator method, TG-DTA，CO2-TPD，BET methods. The results showed that under the conditions: the calcination temperature was 600°C, the KF content was 40%, the degree of polymerization of the polyglycerin was up to 6.21. Catalytic activity depended on the amount of K3AlF6 existed on the surface of catalyst.