Small angle X-ray scattering from MCM-41 and its synthesis gels

optimisation of the synthesis parameters

K. J. Edler, J. Dougherty, R. Durand, L. Iton, G. Kirton, G. Lockhart, Z. Wang, R. Withers, J. W. White

Research output: Contribution to journalArticle

Abstract

We have found optimised conditions for alkaline synthesis of the large pore molecular sieve, MCM-41, by determining small angle X-ray scattering and adsorption isotherms from materials at various stages of the preparation. The presence of highly curved surfaces, sealed structures, and quasicrystalline hexagonal products coexisting with true MCM-41 are all detected by transmission electron microscopy. Calcination must be carried out with care. The product is most crystalline from unstirred preparations which have been heated at 100°C for no longer than three days. Under these conditions, a maximum BET surface area of 1950 m2 g-1 was attained, with evident crystallinity observed by electron diffraction and transmission electron microscopy. In the stirred system, which appears to be in a non-equilibrium state, materials after calcination exhibiting Bragg d-spacings of 35 Å, 37 Å and 38 Å have been identified.

Original languageEnglish
Pages (from-to)213-230
Number of pages18
JournalColloids and Surfaces A: Physicochemical and Engineering Aspects
Volume102
Issue numberC
DOIs
Publication statusPublished - 13 Sep 1995

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Multicarrier modulation
X ray scattering
Calcination
roasting
Gels
gels
Transmission electron microscopy
preparation
transmission electron microscopy
optimization
curved surfaces
Molecular sieves
absorbents
synthesis
products
scattering
Adsorption isotherms
Electron diffraction
crystallinity
isotherms

Keywords

  • Characterisation
  • Mesoporous molecular sieve
  • Synthesis

ASJC Scopus subject areas

  • Surfaces and Interfaces
  • Physical and Theoretical Chemistry
  • Colloid and Surface Chemistry

Cite this

Small angle X-ray scattering from MCM-41 and its synthesis gels : optimisation of the synthesis parameters. / Edler, K. J.; Dougherty, J.; Durand, R.; Iton, L.; Kirton, G.; Lockhart, G.; Wang, Z.; Withers, R.; White, J. W.

In: Colloids and Surfaces A: Physicochemical and Engineering Aspects, Vol. 102, No. C, 13.09.1995, p. 213-230.

Research output: Contribution to journalArticle

Edler, K. J. ; Dougherty, J. ; Durand, R. ; Iton, L. ; Kirton, G. ; Lockhart, G. ; Wang, Z. ; Withers, R. ; White, J. W. / Small angle X-ray scattering from MCM-41 and its synthesis gels : optimisation of the synthesis parameters. In: Colloids and Surfaces A: Physicochemical and Engineering Aspects. 1995 ; Vol. 102, No. C. pp. 213-230.
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AU - Iton, L.

AU - Kirton, G.

AU - Lockhart, G.

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