介孔丝光沸石的制备及其对重芳烃转化反应的催化性能

Preparation of Mesoporous Mordenite and Its Catalytic Performance for Transformation of Heavy Aromatics

用不同浓度的NaOH溶液对丝光沸石进行处理制备了具有复合孔道结构的介孔丝光沸石,并采用X射线衍射、扫描电子显微镜、透射电子显微镜和N2吸附-脱附等方法对其进行了表征.结果表明,随着NaOH溶液浓度的升高,介孔丝光沸石的粒径逐渐变小,分子筛表面的介孔逐渐丰富,孔径分布逐渐变宽,介孔体积逐渐增大呈线性关系.当NaOH浓度为0.50mol/L时,介孔丝光沸石的形貌变为空心沸石微囊或微囊壁.介孔的增加产生扩散效应,适当的NaOH溶液处理有利于提高丝光沸石对C9和C10芳烃的转化能力.

Mesoporous mordenite samples were prepared by treatment in NaOH solution with different concentrations. The samples were characterized by X-ray diffraction, scanning electron microscopy, transmission electron microscopy, and N2 adsorption-desorption methods. The NaOH concentration had a great impact on physicochemical properties of the mesoporous mordenite. With the increase in NaOH concentration, the particle size of the mesoporous mordenite became smaller, the amount of derived mesopores increased, the pore size distribution became broader, and the volume of mesopores increased in a linear manner. When the NaOH concentration was 0.50 mol/L, the mesoporous mordenite became zeolite microbox-like architecture and its fragments. The mordenite after alkaline treatment had much better catalytic performance for transformation of C9 and C10 aromatics to benzene, toluene, and xylene.