Infrared studies on the interaction of N2O adsorbed in transition metal ion-exchanged zeolites A

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Abstract

The suitability of nitrous oxide as probe for the characterization of sorption sites inside transition metal ion-exchanged zeolites A has been tested by FTIR spectroscopy. The ν3 and the ν1 fundamentals of non-dissociatively bound N2O appear in the 2300-2200 cm−1 and 1300-1200 cm−1 regions, the former being exclusively shifted upscale, the latter being situated on both sides of the gasphase frequency. The bands are tentatively assigned to surface compounds of N2O in linear arrangement with the interacting cation. The ν3 fundamental is supposed to indicate the different sorption species, while the ν1 vibration is sensitive to the orientation of adsorbed N2O. Zeolite CuA deviates from the other zeolites, which might be due to autoreduction.

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