Positions of cations and molecules in zeolites with the faujasite-type framework V. La-exchanged Type X zeolite at 25, 425 and 735°C

La-exchanged Type X zeolite activated at 500° and 600° shows three OH infra-red bands which are not completely removed even after vacuum activation at 730°C. At room temperature, the La atoms occupy sites I′, II and V. At 425 and 735°C in a helium stream the La atoms occupy sites I, I′ and II. The s...

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Bibliographic Details
Published in:Materials research bulletin 1969, Vol.4 (2), p.77-86
Main Authors: Bennett, J.M., Smith, J.V., Angell, C.L.
Format: Article
Language:English
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Summary:La-exchanged Type X zeolite activated at 500° and 600° shows three OH infra-red bands which are not completely removed even after vacuum activation at 730°C. At room temperature, the La atoms occupy sites I′, II and V. At 425 and 735°C in a helium stream the La atoms occupy sites I, I′ and II. The simplest interpretation is that La atoms tend to occupy sites I and II when X zeolite is strictly dehydrated and dehydroxylated, and that they prefer site I′ when some residual molecules are available for bonding.
ISSN:0025-5408
1873-4227
DOI:10.1016/0025-5408(69)90021-X