对比研究了SSZ-13(CHA拓扑结构)和RUB-50(LEV拓扑结构)硅铝分子筛笼大小对甲醇制烯烃反应性能的影响,并采用X射线衍射、N2吸附-脱附、固体核磁共振、热重和紫外-可见光谱等技术对催化剂的结构及反应后的碳物种进行了表征.结果表明,笼尺寸较大的SSZ-13分子筛在反应中的稳定性和产物丙烯选择性均较高;而笼尺寸较小的RUB-50分子筛中乙烯的选择性较高.酸洗可以除去分子筛中大部分非骨架Al,且在一定程度上改变了分子筛的酸性,但没有显著改变产物中乙烯和丙烯的相对比例.另外,分子筛笼的大小决定了碳物种的体积,较小笼径的分子筛上可能生成较多的乙烯.因此,用于甲醇制烯烃的分子筛笼径大小对调变产物中乙烯和丙烯选择性十分重要.
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