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Preparation of hierarchical SSZ-13 by NH4F etching.
- Source :
-
Microporous & Mesoporous Materials . Feb2021, Vol. 314, pN.PAG-N.PAG. 1p. - Publication Year :
- 2021
-
Abstract
- NH 4 -SSZ-13 is etched with an aqueous solution of 40 w /% NH 4 F under different time/temperature conditions to obtain hierarchical derivatives. The etched zeolites are characterized by XRD, SEM, N 2 physisorption, 29Si/27Al/19F MAS NMR, ICP-AES, and their acidity monitored by in situ FTIR spectroscopy using acetonitrile as a probe molecule. The results highlight that the zeolite is very sensitive to high temperature and high liquid-solid ratio treatments leading to substantial crystallinity losses. These two parameters need careful tuning to obtain hierarchical derivatives retaining important characteristics as micropore volume and framework Si/Al ratio. The catalytic activity of the modified SSZ-13 is evaluated in the n-propanol conversion. Image 1 • Zeolite SSZ-13 (CHA-type) is subjected to chemical etching in an aqueous NH 4 F solution to introduce mesopores. • The hierarchical zeolite preserved the parent zeolite properties in terms of framework composition and Brønsted acidity. • The obtained SSZ-13 derivatives show higher coke contents but slower deactivation in the dehydration of n-propanol. [ABSTRACT FROM AUTHOR]
Details
- Language :
- English
- ISSN :
- 13871811
- Volume :
- 314
- Database :
- Academic Search Index
- Journal :
- Microporous & Mesoporous Materials
- Publication Type :
- Academic Journal
- Accession number :
- 148433850
- Full Text :
- https://doi.org/10.1016/j.micromeso.2020.110863