分子筛
物理吸附
MCM-41
层状结构
吸附
沸石
微型多孔材料
吸附
结晶学
材料科学
戒指(化学)
化学工程
热液循环
Crystal(编程语言)
化学
物理化学
复合材料
有机化学
程序设计语言
催化作用
工程类
计算机科学
作者
Wiesław J. Roth,Charles T. Kresge,J.C. Vartuli,M. E. Leonowicz,A.S. Fung,S.B. McCullen
出处
期刊:Studies in Surface Science and Catalysis
日期:1995-01-01
卷期号:: 301-308
被引量:201
标识
DOI:10.1016/s0167-2991(06)81236-x
摘要
This chapter describes the physical characterization of MCM-36, which unequivocally establishes its existence as a novel large pore pillared material with zeolite properties. MCM-36 is a pillared material obtained from MCM-22 layers. The preparation of MCM-36 involves a lamellar intermediate, designated MCM-22 precursor, produced in a hydrothermal process. The structural information concerning pore system of MCM-36 is revealed by adsorption methods. The layers in MCM-22 posses two kinds of pore systems. One consists of 10-ring interconnected channels within the layers. The second are isolated 12-ring cages on the surface, which result in pockets on the outside of MCM-22 crystal and internal supercages, accessible through 10-ring apertures, inside the crystal. Accordingly, the pore size distribution plot obtained for MCM-22 by Ar physisorption shows two distinct peak in the 6–7 Å region. The complex pore structure of MCM-22 is also reflected in the unique three step uptake profile of bulky 2,2-dimethylbutane (DMB) observed in the dynamic sorption experiment.
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