多级孔WO_3/ZrO_2固体酸催化剂的制备与表征

Preparation and Characterization of WO_3/ZrO_2 Solid Acid Catalyst with Hierarchically Porous Structure

采用复合模板表面活性剂辅助水热法一步合成了WO3/ZrO2多级孔固体酸催化剂,并应用X射线衍射、低温N2吸附-脱附、拉曼光谱及NH3程序升温脱附对催化剂进行了表征.结果表明,WO3的引入使得WO3/ZrO2催化剂的比表面积增大,表面的酸中心明显增加.在乙酸和正丁醇的酯化反应中,WO3/ZrO2多级孔固体酸催化剂表现出较高的催化活性,并具有一定的重复使用性能.当WO3负载量为20%时,经550oC焙烧5h的WO3/ZrO2固体酸催化剂性能最佳.

WO3/ZrO2 solid acid catalyst with hierarchically porous structure was prepared by the one-pot hydrothermal method involving templating from a composite surfactant.The catalyst samples were characterized by X-ray diffraction,N2 adsorption-desorption,Raman spectroscopy and NH3 temperature-programmed desorption.The results indicated that WO3 doping significantly increased the BET surface area and provided more surface acid centers.The esterification of acetic acid and butanol showed that the hierarchically porous WO3/ZrO2 solid acid catalyst has excellent catalytic activity and reusability.The 20% WO3/ZrO2 sample calcined at 550 oC for 5 h has the highest catalytic activity.