Thermal collapse of SAPO-34 molecular sieve towards a perfect glass

Beitrag in einer Fachzeitschrift


Details zur Publikation

Autor(en): Wondraczek L, Gao G, Moencke D, Selvam T, Kuhnt A, Schwieger W, Palles D, Kamitsos EI
Zeitschrift: Journal of Non-Crystalline Solids
Verlag: Elsevier
Jahr der Veröffentlichung: 2013
Band: 360
Seitenbereich: 36-40
ISSN: 0022-3093


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.



FAU-Autoren / FAU-Herausgeber

Kuhnt, Andreas
Professur für Technische Chemie (Reaktionstechnik)
Schwieger, Wilhelm Prof. Dr.
Professur für Technische Chemie (Reaktionstechnik)


Autor(en) der externen Einrichtung(en)
Friedrich-Schiller-Universität Jena
National Hellenic Research Foundation (NHRF) / Εθνικό Ίδρυμα Ερευνών


Zitierweisen

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.

BibTeX: 

Zuletzt aktualisiert 2018-08-08 um 18:40