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Study of the reductive solid-state ion exchange of indium into an NH4-beta zeolite

✍ Scribed by R.M. Mihályi; H.K. Beyer; V. Mavrodinova; Ch. Minchev; Y. Neinska

Publisher
Elsevier Science
Year
1998
Tongue
English
Weight
156 KB
Volume
24
Category
Article
ISSN
1387-1811

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✦ Synopsis

The incorporation of indium() cations into zeolite beta by reductive solid-state ion exchange has been studied by TPR/TPO techniques, FTIR spectroscopy and a catalytic test reaction (isomerization of m-xylene). Among the hydroxyl groups observed in zeolite beta, those vibrating at 3610 cm-1 (bridged hydroxyls) were found to be preferentially involved in the exchange process, resulting in In+ lattice cations. Reoxidation leads to the formation of cationic InO+ species. After pyridine adsorption, In+ and InO+ can be distinguished by typical IR bands at 1446 and 1455 cm-1, respectively. Details of the redox behavior of the cationic indium species are reported.

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