TiO_2负载磷钨酸催化剂的制备及其催化乙二醇与硬脂酸双酯化反应研究

Preparation and Catalytic Properties of Supported Phosphotungstic Acid

以二氧化钛为载体、磷钨酸为活性物质,采用浸渍法制备了二氧化钛负载磷钨酸催化剂,硬脂酸和乙二醇双酯化反应为模版,筛选出高活性的负载型催化剂.探讨了不同载体、负载量、催化剂用量及其重复使用对双酯化反应的影响.当二氧化钛负载磷钨酸的负载量为15.8%,催化剂用量为0.2%,反应温度为120℃,反应4h,产物产率可达93.5%.该负载型催化剂是一种选择性高、催化性能良好的环境友好型催化剂,而且重复使用效果好.

The titanium dioxide supported phosphotungstic acid catalyst was prepared by impregnation which titanium dioxide as a carrier and phosphotungstic acid as the active substance. The catalytic activity of supported catalyst was tested by the esterification reaction of ethylene glycol and stearic acid. Using this template reaction, we screened the high activity catalyst in term with different carrier and its load. Under suitable esterification conditions, the catalyst activity test results shown that titanium dioxide supported phosphotungstic acid catalyst loading was 15.8%, amount of catalyst 0.2%, at 120 ~C for 4h, the yield of ethylene glycol distearate can up to 93.5%. The supported catalyst is a high selectivity with excellent catalytic performance and environmentally friendly catalyst and it can be reused.