SO_4^(2-)/ZrO_2-MgO固体酸催化剂的合成及其催化合成醋酸丙酸纤维素

Preparation of SO_4^(2-)/ZrO_2-MgO Solid Acid Catalyst and Its Catalytic Activity in Cellulose Acetate Propionate Synthesis

用浸渍法制备SO24-/ZrO2-MgO固体酸催化剂,用X射线衍射、红外光谱、NH3程序升温脱附等方法对SO24-/ZrO2-MgO固体酸催化剂进行表征。结果表明,SO24-/ZrO2催化剂中加入适量的Mg有利于四方晶相ZrO2(t)的形成;有利于增加固体酸表面酸强度和酸量。SO24-/ZrO2-MgO催化剂在合成醋酸丙酸纤维素(CAP)的反应中有很高的活性,当n(ZrO2)∶n(MgO)=15∶1,焙烧温度500℃时,催化活性最佳,50℃下,反应8 h后,CAP收率达116.40%。

Solid acid catalyst SO2/4-/ZrO2-MgO was prepared by impregnation and was characterized by means of XRD, FTIR, and NH3-TPD. The results indicate that the addition of Mg in SO24-/ZrO2 was beneficial to the formation of tetragonal crystalline t-ZrO2 and increased the acid strength and acid amount. The catalyst SO]-/ZrO2-MgO was used in cellulose acetate propionate （CAP） synthesis. The catalyst containing the ZrO2/MgO molar ratio of 15：1 and being calcined at 500 ℃ showed the best catalytic activity. The yield of CAP was up to 116.40% when the reaction was carried out at 50 ℃ for 8h.