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Synthesis and structure of polymorph B of zeolite Beta
Stockholms universitet, Naturvetenskapliga fakulteten, Institutionen för fysikalisk kemi, oorganisk kemi och strukturkemi.
Stockholms universitet, Naturvetenskapliga fakulteten, Institutionen för fysikalisk kemi, oorganisk kemi och strukturkemi.
Stockholms universitet, Naturvetenskapliga fakulteten, Institutionen för fysikalisk kemi, oorganisk kemi och strukturkemi.
Vise andre og tillknytning
2008 (engelsk)Inngår i: Chemistry of Materials, ISSN 0897-4756, E-ISSN 1520-5002, Vol. 20, nr 9, s. 3218-3223Artikkel i tidsskrift (Fagfellevurdert) 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.

sted, utgiver, år, opplag, sider
2008. Vol. 20, nr 9, s. 3218-3223
Identifikatorer
URN: urn:nbn:se:su:diva-15423DOI: 10.1021/cm8002244ISI: 000255623400061OAI: oai:DiVA.org:su-15423DiVA, id: diva2:181943
Tilgjengelig fra: 2008-12-02 Laget: 2008-12-02 Sist oppdatert: 2017-12-13bibliografisk kontrollert
Inngår i avhandling
1. 3D Electron crystallography: Real space reconstruction and reciprocal space tomography
Åpne denne publikasjonen i ny fane eller vindu >>3D Electron crystallography: Real space reconstruction and reciprocal space tomography
2010 (engelsk)Doktoravhandling, med artikler (Annet vitenskapelig)
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.

sted, utgiver, år, opplag, sider
Stockholm: Department of Materials and Environmental Chemistry (MMK), Stockholm University, 2010. s. 72
Emneord
Electron crystallography, Electron microscopy, Porous materials
HSV kategori
Forskningsprogram
strukturkemi
Identifikatorer
urn:nbn:se:su:diva-39034 (URN)978-91-7447-044-4 (ISBN)
Disputas
2010-06-08, Magnélisalen, Kemiska övningslaboratoriet, Svante Arrhenius väg 16 B, Stockholm, 10:00 (engelsk)
Opponent
Veileder
Merknad
At the time of the doctoral defense, the following papers were unpublished and had a status as follows: Paper 4: Submitted.Tilgjengelig fra: 2010-05-17 Laget: 2010-05-06 Sist oppdatert: 2010-05-14bibliografisk kontrollert

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