Receiued 2 I st June, 1973 An i.r. study of nitric oxide adsorption on high area MgO (previously degassed at 800°C) at room temperature is reported. The adsorption of NO onto MgO produces i.r. bands at 800-900 cm-I, 110@1250crn-', and 1350-1450cm-'. These absorption bands were assigned to several surface species : NO; ions with various configurations and NOand N202-ions, co-ordinated to Mg2+ ions. The adsorption (3.3 x l O I 3 molecule cm-2, at 10.4 x lo3 N m-2 of NO) occurs in limited surface zones.
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