[BMIM]HSO_4/Al_2O_3催化剂的制备及其在甘油脱水反应中的应用

Preparation of [BMIM]HSO_4/Al_2O_3 and its application in acrolein synthesis from glycerol dehydration

采用两步法合成离子液体[BMIM]HSO4,并采用浸渍法制备了[BMIM]HSO4/Al2O3固载型离子液体催化剂,用TG-DTG、BET、SEM等方法对催化剂进行表征。在常压连续流动的固定床反应器中,考察甘油制备丙烯醛的工艺条件,重点考察了反应温度、离子液体的负载量、体积空速对反应的影响及催化剂的稳定性。结果表明,较优条件为:当催化剂为[BMIM]HSO4/Al2O3,负载量为40%、反应温度为300℃、体积空速为6 h-1时,丙烯醛的选择性可达90.22%,甘油的转化率为100%,且催化剂在使用100 h后仍保持75%的收率。

The ionic liquid [BMIM]HSO4 was synthesized by two steps and the immolized ionic liquid catalyst [BMIM]HSO4/Al2O3 was prepared by impregnation method.The catalyst was characterized by TG-DTG,BET,SEM and etc.In the synthesis of acrolein from glycerol,the effects of the load content of ionic liquid,the reaction temperature,the airspeed and the catalyst stability were studied in a continuous fixed bed reactor under atmospheric pressure.The results showed that the better condition was as follows：the temperature 300 ℃,the load weight content of ionic liquid 40% and airspeed 6 h-1.The acrolein mole selectivity reached 90.22% and glycerol conversion rate reached 100%.After 100 hours,the yield can reach 75% by using the catalyst.