NDLI: Zeolites H-[Ga]ZSM-5 and H-ZSM-5. A comparative study of the introduction of transition-metal cations by a solid-state reaction

Content Provider	Royal Society of Chemistry (RSC)
Author	Slinkin, A. A. Borbely, G. Beyer, G. K. Kucherov, A. V.
Copyright Year	1989
Abstract	A comparative electron spin resonance study of the solid-state reaction of Cu, Fe, Cr or V compounds with H-ZSM-5 and H-[Ga]ZSM-5 has been carried out. The protonic (acid) sites in H-[Ga]ZSM-5 are less powerful and less thermostable ‘traps’ for migrating cationic species than those in H-ZSM-5. In contrast to the case of H-ZSM-5, the sites in H-[Ga]ZSM-5 are not strong enough to stabilize the isolated vanadyl species. However CuII, FeIII and Crv ions which migrate from the outer surface of the zeolite crystals are coordinated in the cationic positions of H-[Ga]ZSM-5. The majority of the ions in H-[Ga]ZSM-5, like those in H-ZSM-5, are located as isolated coordinatively unsaturated cationic species accessible to gas-phase molecules. The presence of superhyperfine splitting in the e.s.r. spectra of Crv provides evidence of an electronic interaction between the unpaired electron of Crv and the nuclear spin of lattice Al3+ or Ga3+ ions.
Starting Page	2737
Ending Page	2747
Page Count	11
File Format	PDF
ISSN	03009599
Volume Number	85
Issue Number	9
Journal	Journal of the Chemical Society, Faraday Transactions 1
DOI	10.1039/F19898502737
Language	English
Publisher	Royal Society of Chemistry
Access Restriction	Open
Subject Keyword	Gallium Spin (physics) Crv ZSM-5 Electron paramagnetic resonance Zeolite Vanadyl ion Crystal structure
Content Type	Text
Resource Type	Article
Subject	Chemistry

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