碳基固体酸催化剂的制备及其催化酯化性能研究

The preparation of carbon-based solid acid catalyst and catalytic esterification performance study

以对甲苯磺酸和葡萄糖为原料,采用一步碳化法制备新型碳基固体酸催化剂,以1,4-丁二醇双琥珀酸聚醚(3)正辛基混合双酯磺酸钠制备过程的双酯化反应Ⅱ为探针,考察了m(对甲苯磺酸)/m(葡萄糖)、碳化温度和碳化时间对催化活性影响,用TEM、BET、XRD、IR、元素分析、热重分析等对催化剂进行了表征。结果表明,在m(对甲苯磺酸)/m(葡糖糖)=1∶2、碳化温度210℃下碳化8 h,得到的碳基固体酸催化剂形成致密的含有多级孔道的聚环碳架结构,磺酸基含量为21.21%。反应酯化率达到95%以上,并且该催化剂具有良好的热稳定性和重复使用性。

A new carbon-based solid acid catalyst was prepared by a one-step carbonization method with p-toluene sulfonic acid and glucose as raw materials. The catalyst was characterized by TEM,BET,XRD,IR,elemental analysis,thermogravimetric. The double esterification reactionⅡ of the surfactant 1,4- butanediol dual succinate polyether( 3) nocytl mixed double ester sulfonic acid sodium was taken as the probe reaction to investigate the impact of the m( p-toluene sulfonic acid) / m( glucose),carbonization temperature and carbonization time on the catalytic activity. The results showed that the carbon-based solid acid catalyst prepared under the optimal conditions of carbonization at 210 ℃ for 8 h and in the m( p-toluene sulfonic acid) / m( sugar) = 1∶ 2,which had a condensed ring carbon frame structure containing multiple channels and the sulfonic acid group content reached 21. 21%. Esterification rate reached over 95%,and the catalyst showed considerable heat stability and reusability.