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Acidic and Basic Sites in Nax aNd Nay fAujasites Investigated By Nh3, Co2 and Co Molecular Probes

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The acid-base properties of samples ofNaY and NaX faujasites have been investigated by adsorbing different probe molecules and measuring IR spectra. In the case of the NaY sample, only Na+ ions were found to be involved in the adsorption of CO2 and CO, confirming the overwhelming Lewis acid character of this material. In contrast, carbonate-like species were formed by adsorbing carbon dioxide on the NaX sample, due to the reaction of basic framework oxygen atoms with CO2 molecules polarised on neighbour Na+ ions. The spectroscopic analysis of NaX also showed evidence of Bronsted acid hydroxyls and OH groups bonded to extra-framework Al atoms. Ammonia adsorption revealed that the amount of Brønsted acid hydroxyls is significantly lower than the Lewis acid Na+ countercations. Moreover, small oxide particles, carrying carbonate-like species on their surface, are present in the zeolitic cavities. These particles could be responsible for the basic reactivity towards CO observed after outgassing the NaX sample at high temperature.

Affiliations: 1: Dipartimento di Chimica IFM, Università di Torino, Via P. Giuria 7, 10125 Torino, Italy; 2: Center for Advanced Research of Energy Technology, Hokkaido University, Sapporo 060, Japan


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