超声制备锆基柱撑膨润土及其MTO催化性能

Ultrasonic synthesis and characterization of Zr-pillared montmorillonite for MTO catalytic reaction

在超声波作用下,以钠基膨润土为原料、ZrOCl2 8H2O为锆源,制备了锆基柱撑膨润土(Zr-PILM)。结合XRD、BET、FTIR、SEM、吡啶吸附IR光谱等技术对柱撑膨润土进行表征,结果表明:Zr-PILM颗粒保留了较完整的层状和片状结构,层间距和比表面积增加。Zr-PILM的B酸和L酸总量都减少,形成了适宜催化甲醇制低碳烯烃反应的酸位点。超声法制备Zr-PILM用于甲醇制烯烃催化反应,在体积空速1.2 h-1、反应温度360℃时,甲醇的转化率达94.4%,低碳烯烃总选择性达到73.9%。

Zr-pillared montmorillonites（Zr-PILM） were prepared by irradiation with ultrasonic wave with montmorillonite as raw material and zirconium oxychloride as Zr source of pillaring agent.The properties of the Zr-pillared montmorillonites were characterized by XRD,BET,FTIR,SEM and Py-IR.The effects of synthesis conditions on the structures of Zr-PILM were investigated.The results indicated that Zr-PILM retained complete layered and flaked structure,and its interlayer spacing and BET surface increased.The acid strength of B and L acids of Zr-PILM reduced,which are more appropriate for the catalytic reaction of MTO.The Zr-PILM synthesized by ultrasonic irradiation exhibited excellent catalytic activity for MTO reaction.The methanol conversion reached 94.4 % and the selectivity of total light olefins in MTO reaction was 73.9%,under the condition of volumetric space velocity 1.2 h-1 and reaction temperature 360℃.