Abstract

Nitric oxide adsorption over nickel-exchanged A-type zeolites has been investigated by gravimetry, e.s.r. and i.r. spectroscopy. Depending upon the nickel content of the zeolite and its dehydration process, four different nickel—nitrosyl complexes have been observed. They differ in structure as well as stability. Spin concentrations and gravimetric measurements agree well with an overall stoichiometry of one NO molecule per nickel ion in all cases.

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