24小时热门版块排行榜

南方科技大学公共卫生及应急管理学院2025级博士研究生招生报考通知

返回列表

当前只显示满足指定条件的回帖，点击这里查看本话题的所有回帖

leiws

至尊木虫 (职业作家)

木虫浪子

应助: 327 (大学生)
金币: 20371.5
散金: 1872
红花: 62
帖子: 3920
在线: 2134.6小时
虫号: 832300
注册: 2009-08-22
性别: GG
专业: 催化化学

[交流] 从沸石结构扩张，拓扑转换所想到的... Nature 全文赏析已有4人参与

近来，Nature 刊文RHO沸石家族接连增添了两个新的成员PST-20，PST-25, 即材料的空间维度扩展来构造新结构的材料~~
Title:
A zeolite family with expanding structural complexity and embedded isoreticular structures
Authors:
Peng Guo,Jiho Shin, Alex G. Greenaway, Jung Gi Min, Jie Su, Hyun June Choi, Leifeng Liu, Paul A. Cox, Suk Bong Hong, Paul A. Wright & Xiaodong Zou
Abstract:
The prediction and synthesis of new crystal structures enable the targeted preparation of materials with desired properties. Among porous solids, this has been achieved for metal–organic frameworks1, 2, 3, but not for the more widely applicable zeolites4, 5, where new materials are usually discovered using exploratory synthesis. Although millions of hypothetical zeolite structures have been proposed6, 7, not enough is known about their synthesis mechanism to allow any given structure to be prepared. Here we present an approach that combines structure solution with structure prediction, and inspires the targeted synthesis of new super-complex zeolites. We used electron diffraction to identify a family of related structures and to discover the structural ‘coding’ within them. This allowed us to determine the complex, and previously unknown, structure of zeolite ZSM-25 (ref. 8), which has the largest unit-cell volume of all known zeolites (91,554 cubic ångströms) and demonstrates selective CO2 adsorption. By extending our method, we were able to predict other members of a family of increasingly complex, but structurally related, zeolites and to synthesize two more-complex zeolites in the family, PST-20 and PST-25, with much larger cell volumes (166,988 and 275,178 cubic ångströms, respectively) and similar selective adsorption properties. Members of this family have the same symmetry, but an expanding unit cell, and are related by hitherto unrecognized structural principles; we call these family members embedded isoreticular zeolite structures.
Download link:
http://www.nature.com/nature/jou ... ll/nature14575.html
Structure Evolution:

-------------------------------------------------------------------------------------------------------------------------------------------
a) 从沸石的构造方式来讲，常见的沸石一般是有基本构筑基元来构筑比如说d4r,d6r，sod, lta 等等..或是近几年比较火的沸石本身的就是二维材料，通过重新引入有机材料还有填充分子进行固化形成空间维度不一的材料比如IPC-1~4，UTL, MWW，FER或是有机无机杂化材料等等...对比这篇文章中的实例似乎有提供了一种从三维空间维度来构造多孔材料的一种新的方法...
b) 另外上述文章中得到的材料的孔的开度为8MR，所以此材料用在CO2 分离或是MTO可能有着不错的效果；
欢迎大家拍砖~~~

回复此楼

» 本帖附件资源列表

欢迎监督和反馈：小木虫仅提供交流平台，不对该内容负责。
本内容由用户自主发布，如果其内容涉及到知识产权问题，其责任在于用户本人，如对版权有异议，请联系邮箱：xiaomuchong@tal.com
附件 1 : A_zeolite_family_with_expanding_structural_complexity_and_embedded_isoreticular_structures.pdf

2015-07-28 20:31:44, 4.17 M