沸石
硅酸铝
埃
ZSM-5型
衍射
歧管(流体力学)
催化作用
微型多孔材料
结晶学
粉末衍射
材料科学
拓扑(电路)
几何学
化学
戒指(化学)
物理
光学
数学
组合数学
有机化学
机械工程
工程类
作者
Stephen L. Lawton,Wayne J. Rohrbaugh
出处
期刊:Science
[American Association for the Advancement of Science (AAAS)]
日期:1990-03-16
卷期号:247 (4948): 1319-1322
被引量:161
标识
DOI:10.1126/science.247.4948.1319
摘要
ZSM-18 is the first known aluminosilicate zeolite to contain rings of three (Si,Al)-O species (3-rings). Its framework topology has been determined by hypothetical model building, subsequent constrained distance and angle least-squares refinements of atomic coordinates, and x-ray powder diffraction pattern simulations. Its channel structure is characterized by a linear unidimensional 12-ring channel, with an approximate pore opening of 7.0 angstroms. In addition, the channels are lined with pockets that are capped by 7-rings with dimensions of 2.8 angstroms by 3.5 angstroms. An intraframework packing model of the organic moiety used in the synthesis suggests that a strong templating effect may be responsible for the formation of this unusual zeolite structure.
科研通智能强力驱动
Strongly Powered by AbleSci AI