Carbon monoxide adsorption on low-silica zeolites: from single to dual and to multiple cation sites.
Infrared spectra of CO adsorbed on the Al-rich Na-A zeolite were analysed by using a combined theoretical and experimental approach, showing that such spectra cannot be interpreted by assigning each IR band to CO interacting with a specific type of single cation site. This concept, which usually works well for high-silica zeolites, should not be uncritically extended to Al-rich zeolites that are crowded with cations in configurations which lead to preferential formation of CO adsorption complexes involving more than one cation site.
Otero Areán
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C
Departamento de Química, Universidad de las Islas Baleares, E-07122, Palma de Mallorca, Spain.
Rodríguez Delgado
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López Bauçà
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C
Vrbka
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Nachtigall
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P