采用晶种有机硅烷化法合成了纳米团簇ZSM-5沸石,考察了其在芳烃苄基化反应中的催化活性.X射线衍射、N2吸附和扫描电镜等结果表明,该沸石为由约20 nm的小晶粒聚集成的团簇体,并形成晶间中孔,其具有的外表面积是普通ZSM-5沸石的5倍之多.NH3-程序升温脱附和吡啶吸附的红外光谱结果显示,沸石的纳米化可使其表面酸中心,尤其是强酸中心的数目增多,大大提高了大分子的酸性位可接近性.在芳烃苄基化反应中,纳米ZSM-5沸石克服了反应分子空间位阻对催化活性的影响,表现出优异的催化活性,363 K时,甲苯苄基化反应的速率常数是普通ZSM-5沸石的约13倍.
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