UV spectroscopic study of oxidized and reduced palladium loaded zeolites |
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| Authors: | E. Garbowski M. Primet M. V. Mathieu |
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| Affiliation: | (1) Institut de Recherches sur la Catalyse, CNRS, 79 Boulevard du Onze Novembre 1918, 69626 Villeurbanne Cedex, France;(2) U.E.R. de Chimie-Biochimie Université Claude Bernard, Lyon I |
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| Abstract: | UV and visible reflectance spectra of Pd(II) ion exchanged zeolites have been recorded before and after hydrogen reduction. The reduction was performed either at 25°C (60% reduction) or at 500°C. Reoxidation by oxygen at 400°C restored the initial Pd(II) ions only in the case of the sample reduced at low temperature. With nitric oxide, reoxidation occurred even at 25°C, regardless of the temperature of reduction, The Pd(II) ions were redispersed in the zeolite lattice through the formation of nitrosyl complexes.
                      Pd(II)  .    25°C ( 60%) 500°C.  400°C   Pd(II)    , . 25°C ; Pd(II) .
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