Abstract
The solid-state ion exchange of Rh chloride with highly dealuminated Y zeolite has been studied by in situ FTIR spectroscopy. Thermal treatment in vacuum and calcination in oxygen up to 600°C results in an exchange limited to ca. 25% at temperatures higher than 400°C. The ion exchange can be performed much more effectively (over 50%) and at lower temperatures (100–150°C) in the presence of CO in the gas phase. A linear correlation has been found between the formation of well-defined Rh(CO) +2 species and the simultaneous loss of acid hydroxyl groups for samples treated at different conditions. From these results a model is proposed with the formation of Rh subcarbonyls, the migration of these species to the cation positions of the zeolite and, finally, the formation of the stable well-defined Rh(CO) +2 species at these positions as essential steps of the ion exchange in the presence of CO.
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Schlegel, L., Miessner, H. & Gutschick, D. Solid-state ion exchange of rhodium chloride with highly dealuminated Y-type zeolite DAY by thermal treatment and in the presence of carbon monoxide. Catal Lett 23, 215–226 (1994). https://doi.org/10.1007/BF00811356
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DOI: https://doi.org/10.1007/BF00811356