A physico-chemical study of Ga-ZSM-5 zeolite
- 1 January 1989
- journal article
- research article
- Published by Royal Society of Chemistry (RSC) in Journal of the Chemical Society, Faraday Transactions 1: Physical Chemistry in Condensed Phases
- Vol. 85 (10) , 3215-3220
- https://doi.org/10.1039/f19898503215
Abstract
X-Ray powder diffraction, scanning electron microscopy, ion-exchange capacity, methylene blue adsorption measurements and i.r. spectral data of absorbed nitrogen dioxide, pyridine and acetylacetone have been used to characterize the Ga-ZSM-5 zeolite. Ion-exchange capacity studies have shown that the Ga3+ is incorporated into the zeolitic framwork over a wide range of Ga3+ contents. Staining of the zeolitic crystals by methylene blue has been used to assess the simultaneous formation of silicalite and Ga-ZSM-5 zeolite and compare with that found in the formation of the Fe3+ and Al3+ forms of the zeolite. The order of tenacious metal isomorphous substitution into the framework is Fe3+ > Ga3+ > Al3+. Methylene blue adsorption studies show the order of greatest Brønsted acidity is Al-ZSM-5 > Ga-ZSM-5 > Fe-ZSM-5.Keywords
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