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Synthesis and structure of polymorph B of zeolite Beta
Stockholm University, Faculty of Science, Department of Physical, Inorganic and Structural Chemistry.
Stockholm University, Faculty of Science, Department of Physical, Inorganic and Structural Chemistry.
Stockholm University, Faculty of Science, Department of Physical, Inorganic and Structural Chemistry.
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2008 (English)In: Chemistry of Materials, ISSN 0897-4756, E-ISSN 1520-5002, Vol. 20, no 9, 3218-3223 p.Article in journal (Refereed) Published
Abstract [en]

It was found that either polymorph B or polymorph C of zeolite beta can be obtained from the same structure directing agent: 4,4-dimethyl-4-azonia-tricyclo[5.2.2.02,6]undec-8-ene hydroxide. The synthesis occurs through a consecutive process where polymorph B is first formed and then transformed into polymorph C. It is possible to produce a zeolite highly enriched in polymorph B, provided that the transformation of this phase into polymorph C is slowed down up to the point where polymorph C is only detected at trace levels. The structure of polymorph B was determined for the first time by electron crystallography with SAED and HRTEM from areas of unfaulted polymorph B crystals.

Place, publisher, year, edition, pages
2008. Vol. 20, no 9, 3218-3223 p.
Identifiers
URN: urn:nbn:se:su:diva-15423DOI: 10.1021/cm8002244ISI: 000255623400061OAI: oai:DiVA.org:su-15423DiVA: diva2:181943
Available from: 2008-12-02 Created: 2008-12-02 Last updated: 2010-05-14Bibliographically approved
In thesis
1. 3D Electron crystallography: Real space reconstruction and reciprocal space tomography
Open this publication in new window or tab >>3D Electron crystallography: Real space reconstruction and reciprocal space tomography
2010 (English)Doctoral thesis, comprehensive summary (Other academic)
Abstract [en]

Electron crystallography is an important technique for studying micro- and nano-sized materials. It has two important advantages over X-ray crystallography for structural studies: 1) crystals millions of times smaller than those needed for X-ray diffraction can be studied; 2) it is possible to; focus the electrons to form an image. The local atomic arrangement can be seen directly by high-resolution transmission electron microscopy (HRTEM). The crystallographic structure factor phases, which are lost in recording diffraction patterns, are present in HRTEM images and can be determined experimentally. The main disadvantages of electron crystallography compared to X-ray diffraction are that the data are difficult to collect, often incomplete and suffer from dynamic scattering. New methods need to be developed to overcome these problems. In this work, structure determination of several unique and complex porous materials including zeolites and mesoporous silica is demonstrated. None of the structures of these materials could be solved by X-ray crystallography. New techniques are also developed in order to overcome the disadvantages of electron crystallography. The new techniques include a digital sampling method for collecting precession electron diffraction data and a rotation method for automatic collection of complete 3D electron diffraction data. A number of practical issues concerning data collection and data processing are described and the data quality is analysed.

Place, publisher, year, edition, pages
Stockholm: Department of Materials and Environmental Chemistry (MMK), Stockholm University, 2010. 72 p.
Keyword
Electron crystallography, Electron microscopy, Porous materials
National Category
Chemical Sciences
Research subject
Structural Chemistry
Identifiers
urn:nbn:se:su:diva-39034 (URN)978-91-7447-044-4 (ISBN)
Public defence
2010-06-08, Magnélisalen, Kemiska övningslaboratoriet, Svante Arrhenius väg 16 B, Stockholm, 10:00 (English)
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Note
At the time of the doctoral defense, the following papers were unpublished and had a status as follows: Paper 4: Submitted.Available from: 2010-05-17 Created: 2010-05-06 Last updated: 2010-05-14Bibliographically approved

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