Infrared study of hydrogen adsorption on MgO, CaO and SrO. Possible mechanism in promoting O –2 formation
Abstract
Hydrogen adsorption on high-surface-area alkaline-earth oxides has been studied by i.r. spectroscopy at 300 and 78 K. In the former case heterolytic dissociation of H2 molecules produces hydride and hydroxy groups which are partially reversible upon evacuation. Low-temperature hydrogen adsorption appears to be undissociative. The active sites are cation–anion couples in low coordination on the surface.
On the basis of i.r. evidence a mechanism is proposed for the interaction of oxygen with preadsorbed hydrogen envisaging an electron-transfer process from H– ions to oxygen molecules to give O–2 paramagnetic species.
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