Small angle X-ray scattering from MCM-41 and its synthesis gels : optimisation of the synthesis parameters
(1995) In Colloids and Surfaces A: Physicochemical and Engineering Aspects 102(C). p.213-230- 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... (More)
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.
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- author
- Edler, K. J. LU ; Dougherty, J. ; Durand, R. ; Iton, L. ; Kirton, G. ; Lockhart, G. ; Wang, Z. LU ; Withers, R. and White, J. W.
- publishing date
- 1995-09-13
- type
- Contribution to journal
- publication status
- published
- keywords
- Characterisation, Mesoporous molecular sieve, Synthesis
- in
- Colloids and Surfaces A: Physicochemical and Engineering Aspects
- volume
- 102
- issue
- C
- pages
- 18 pages
- publisher
- Elsevier
- external identifiers
-
- scopus:0002256775
- ISSN
- 0927-7757
- DOI
- 10.1016/0927-7757(95)03241-5
- language
- English
- LU publication?
- no
- id
- 248f6381-6189-45ac-9466-1c7ec04f2c46
- date added to LUP
- 2022-07-12 15:53:59
- date last changed
- 2022-08-12 12:56:00
@article{248f6381-6189-45ac-9466-1c7ec04f2c46, abstract = {{<p>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 m<sup>2</sup> g<sup>-1</sup> 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.</p>}}, author = {{Edler, K. J. and Dougherty, J. and Durand, R. and Iton, L. and Kirton, G. and Lockhart, G. and Wang, Z. and Withers, R. and White, J. W.}}, issn = {{0927-7757}}, keywords = {{Characterisation; Mesoporous molecular sieve; Synthesis}}, language = {{eng}}, month = {{09}}, number = {{C}}, pages = {{213--230}}, publisher = {{Elsevier}}, series = {{Colloids and Surfaces A: Physicochemical and Engineering Aspects}}, title = {{Small angle X-ray scattering from MCM-41 and its synthesis gels : optimisation of the synthesis parameters}}, url = {{http://dx.doi.org/10.1016/0927-7757(95)03241-5}}, doi = {{10.1016/0927-7757(95)03241-5}}, volume = {{102}}, year = {{1995}}, }