Abstract
The environment, location and interaction of the Ce 3+ ions in the micropores of Al- and Zr-pillared clays have been studied by UV–vis-diffuse reflectance spectroscopy (UV–vis-DRS). The DRS spectra show that the chemical environment of the Ce 3+ ions in cerium exchanged clay is different from that of the Al- and Zr-pillared clays. The Al–Ce pillared clays (Al–Ce-PM) show four distinct absorption bands at 224, 263, 294 and 342 nm in the UV region which are attributed to 4f → 5d interconfigurational transitions of Ce 3+ ions associated with alumina pillars. The O 2− → Ce 3+ charge transfer band observed at 263 nm for Ce-exchanged and Al–Ce-PM clays is blue shifted by 10 nm for Ce–Zr-pillared clays (Ce–Zr-PM) due to fully hydrated Ce 3+ ions. The Ce 3+ ions are incorporated in the Al- and Zr-pillars possibly as AlCeO 3 and Ce x Zr 1− x O 2 particles upon heat treatment.
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