Thermal collapse of SAPO-34 molecular sieve towards a perfect glass
Wondraczek L, Gao G, Moencke D, Selvam T, Kuhnt A, Schwieger W, Palles D, Kamitsos EI (2013)
Publication Status: Published
Publication Type: Journal article
Publication year: 2013
Journal
Publisher: Elsevier
Book Volume: 360
Pages Range: 36-40
DOI: 10.1016/j.jnoncrysol.2012.10.001
Abstract
Controlled collapse of a silicoaluminophosphate molecular sieve CHA-type SAPO-34 by thermal aging was studied in a multi-method approach. Structural changes and the mechanism of order-disorder-order transitions during collapse were followed for varying annealing conditions between 1000 and 1100 degrees C. Collapse of SAPO-34 occurs via the formation of an intermediate amorphous state by the loss of long-range order but preservation to a high degree of short-range order and macroscopic morphology. This intermediate amorphous state with low entropy may be classified as a "perfect glass". Prolonged aging in the collapse regime results in the precipitation of crystalline AlPO4 while the SiO2 species initially remain in an amorphous phase. Further increasing the aging temperature leads to virtually complete recrystallization and, ultimately, melting. (c) 2012 Elsevier B.V. All rights reserved.
Authors with CRIS profile
Lothar Wondraczek
Andreas Kuhnt Professur für Technische Chemie (Reaktionstechnik) Wilhelm Schwieger Professur für Technische Chemie (Reaktionstechnik)
Andreas Kuhnt Professur für Technische Chemie (Reaktionstechnik) Wilhelm Schwieger Professur für Technische Chemie (Reaktionstechnik)
Involved external institutions
Friedrich-Schiller-Universität Jena
Germany (DE)
National Hellenic Research Foundation (NHRF) / Εθνικό Ίδρυμα Ερευνών
Greece (GR)
Germany (DE)
National Hellenic Research Foundation (NHRF) / Εθνικό Ίδρυμα Ερευνών
Greece (GR)
How to cite
APA:
Wondraczek, L., Gao, G., Moencke, D., Selvam, T., Kuhnt, A., Schwieger, W.,... Kamitsos, E.I. (2013). Thermal collapse of SAPO-34 molecular sieve towards a perfect glass. Journal of Non-Crystalline Solids, 360, 36-40. https://dx.doi.org/10.1016/j.jnoncrysol.2012.10.001
MLA:
Wondraczek, Lothar, et al. "Thermal collapse of SAPO-34 molecular sieve towards a perfect glass." Journal of Non-Crystalline Solids 360 (2013): 36-40.
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