No abstract

Nitrogen monoxide (NO) introduced into partially and fully lithium ion (Li + )-exchanged A-type zeolite was studied by X-band EPR measurements. Two types of NO species, NO monoradical and NO-NO biradical, were detected for the partially ion-exchanged zeolite, while the latter was less detectable for the fully ion-exchanged one. The EPR parameters of the NO monoradical provided evidence that the electrostatic field associated with Li + ions in A-type zeolites is weaker than that with Na + ions. It was found that the molecular distance of NO biradical formed in partially Li + -exchanged zeolite was shorter than that in sodium ion-exchanged A-type zeolite.