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 N₂O^2–₂ 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.