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Insights into the formation of microporous materials by in situ X-ray scattering techniques

Sankar, G; Bras, W; (2009) Insights into the formation of microporous materials by in situ X-ray scattering techniques. In: CATALYSIS TODAY. (pp. 195 - 203). ELSEVIER SCIENCE BV

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Abstract

Here we demonstrate the power of in situ scattering techniques in the understanding of formation of nanoporous aluminosilicate and aluminophosphate materials. We utilised a number of X-ray techniques, in particular, in situ energy dispersive X-ray diffraction (EDXRD) and small angle and wide angle X-ray scattering (SAXS/WAXS) techniques for this purpose. The in situ SAXS measurements show the formation of homogeneous precursors in the size of ca. 10 nm, prior to the crystallization of LTA. The crystal size is estimated by fitting the SAXS patterns with an equation for a cubic particle, and it is revealed that the final crystal size of the LTA depends on the synthesis temperature. Whereas, the crystallisation of CoAlPO-5, occurs through the formation of poly-dispersed particles with an average size of the precursor particle of ca. 50 nm. Also shown the effect of temperature and structure directing organic cations on the production of CoAlPO-5 materials. (C) 2009 Elsevier B.V. All rights reserved.

Type:Proceedings paper
Title:Insights into the formation of microporous materials by in situ X-ray scattering techniques
Event:Workshop of the European-Synchrotron-Radiation-Facility
Location:Grenoble, FRANCE
Dates:2008-02
DOI:10.1016/j.cattod.2009.05.010
Keywords:Microporous materials, In situ, X-ray scattering, Catalytic materials, MOLECULAR-SIEVE CATALYSTS, NANOSIZED ZEOLITE-A, SMALL-ANGLE, SELECTIVE OXIDATION, HYDROTHERMAL SYNTHESIS, SYNCHROTRON-RADIATION, NANOCRYSTAL GROWTH, CORDIERITE GLASS, SOLID CATALYSTS, COPPER CATALYST
UCL classification:UCL > School of BEAMS > Faculty of Maths and Physical Sciences > Chemistry

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