[BMIM]HSO_4/Al_2O_3催化甘油脱水反应的研究

CATALYTIC PROPERTIES OF [BMIM]HSO_4/Al_2O_3 FOR 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催化剂,用IR、1 HNMR、TG-DTG等方法对催化剂进行了表征。在常压连续流动的固定床反应器中,考察了甘油制备丙烯醛的工艺条件,结果表明:在催化剂为[BMIM]HSO4/Al2O3,负载量为40%、反应温度为300℃、体积空速为6h-1时,丙烯醛的摩尔选择性可达90%,甘油的转化率为100%,且反应100h后丙烯醛收率仍达到75%。

Ionic liquid [BMIM]HSO4 was synthesized through two steps. [BMIM]HSO4/Al2O3 was prepared by an impregnation method with Al2O3 as the carrier. The catalyst was characterized by IR, TG-DTG, 1H NMR, etc. The conditions of the glycerol conversion to acrolein was studied in a continuous fixed bed reactor. The results showed that at 300 ＊C, the loading of ionic liquid （mass ratio） 40 % and gas hourly space velocity of 6 h-1 , the acrolein molar selectivity reached 90% and the glycerol conversion reached 100%. After 100 h, the yield was still above 75%.