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.

LanguageEnglish
Pages213-230
Number of pages18
JournalColloids and Surfaces A: Physicochemical and Engineering Aspects
Volume102
Issue numberC
DOIs
StatusPublished - 13 Sep 1995

Fingerprint

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.

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