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  Synthesis of large optically clear silicoaluminophosphate crystals with AFI structure

Demuth, D., Stucky, G., Unger, K., & Schüth, F. (1995). Synthesis of large optically clear silicoaluminophosphate crystals with AFI structure. Microporous and Mesoporous Materials, 3(4-5), 473-487. doi:10.1016/0927-6513(94)00060-9.

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 Creators:
Demuth, D.1, 2, Author              
Stucky, G.D.3, Author
Unger, K.K.1, Author
Schüth, F.1, 2, Author              
Affiliations:
1Institut für Anorganische und Analytische Chemie, Johannes Gutenberg-Universität Mainz, Becherweg 24, 55099 Mainz, Germany, ou_persistent22              
2Research Department Schüth, Max-Planck-Institut für Kohlenforschung, Max Planck Society, ou_1445589              
3Department of Chemistry, University of California-Santa Barbara, Santa Barbara, CA 93106. USA, ou_persistent22              

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Free keywords: SAPO-5; AlPO4-5; Synthesis; Crystal morphology; Particle size
 Abstract: The optimization of the hydrothermal SAPO-5 synthesis using the system A2O3:P2O5:SiO2:TEA (triethylamine): H2O resulted in the formation of large crystals (average size of up to 220 × 50 μm) of hexagonal rod-like morphology and high optical quality in high yields only, if an aluminum oxide hydrate sol or a pseudohydrargillite was used as aluminum source. It was possible to control the morphology and the crystal size of SAPO-5 by the silica source used. Further, it was found that the silica in the synthesis gel drastically influences the rate of crystal growth in the crystallographic c-axis. The amount of pyrogenic silica acid used controls the morphology of the crystals, while the reactivity of the silica determines the crystal size obtained. With powder X-ray diffraction (XRD) and thermogravimetric analysis-differential thermal analysis (TGA-DTA) it was demonstrated that silicon predominantly substitutes for phosphorus sites if a silicon molar fraction (Si/Al+P+Si) of <0.06 is used in the synthesis gel.

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Language(s): eng - English
 Dates: 2000-02-141995-01
 Publication Status: Published in print
 Pages: -
 Publishing info: -
 Table of Contents: -
 Rev. Type: Peer
 Identifiers: DOI: 10.1016/0927-6513(94)00060-9
 Degree: -

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Title: Microporous and Mesoporous Materials
Source Genre: Journal
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Publ. Info: Amsterdam : Elsevier
Pages: - Volume / Issue: 3 (4-5) Sequence Number: - Start / End Page: 473 - 487 Identifier: ISSN: 1387-1811
CoNE: https://pure.mpg.de/cone/journals/resource/954926228401