Infra-red Study of Nitric Oxide Adsorption on Magnesium Oxide

Abstract

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–1, 1100–1250 cm–1, and 1350–1450 cm–1. These absorption bands were assigned to several surface species: NO–2 ions with various configurations and NO– and N2O2–2 ions, co-ordinated to Mg2+ ions. The adsorption (3.3 × 1013 molecule cm–2, at 10.4 × 103 N m–2 of NO) occurs in limited surface zones.