Abstract
Due to their catalytic, adsorptive and exchange properties aluminium-free layered silicate hydrates are interesting supplements to the well-known crystalline porous zeolites and alumophosphates. To create active sites Cerium ions were introduced into the interlayer space of metal silicate hydrates by an ion exchange process. A Ce/Na ion exchange was carried out with a 0.1N Ce(NO 3 ) 3 -solution at room temperature. Two types of air dried Ce-containing layered silicates, ilerite and magadiite, were analysed by XANES and EXAFS spectroscopy at the Ce L III -edge. Both valence states Ce 3+ and Ce 4+ have been detected but Ce 3+ dominated at all. The ratio of Ce 4+ /Ce 3+ at ilerite was larger than that for magadiite. This result leads to the conclusion, that the local order must be higher around cerium in the ilerite.
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