| Abstract
| - The N2 adsorption occurring at temperatures around room temperature is a particularly surprising phenomenongiven by the copper ion-exchanged MFI-type zeolite (CuMFI). However, the assignment of the active sitesfor N2 adsorption on CuMFI at room temperature is controversial: which ones act as the real active center,the dimeric or monomeric Cu+ sites? We have analyzed the real active site for N2 adsorption by studying theadsorption of CO and N2, and also by spectroscopic methods, such as photoluminescence, X-ray absorptionfine structure, and IR measurements. Clear evidence was observed for the adsorption of N2 molecules on themonomeric Cu+ ions exchanged in the MFI-type zeolite at temperatures around room temperature, whichputs to an end the dispute regarding the dimeric state made up of the monovalent copper ions as being apotential adsorption site.
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