Behaviour of dinitrogen species adsorbed on a Co/Al2O3 catalyst with or without coadsorbed hydrogen studied by infrared spectroscopy

Abstract

The adsorption of nitrogen over an alumina-supported cobalt catalyst has been studied by means of infrared spectroscopy. An infrared band due to dinitrogen species adsorbed over the catalyst appears at 2214 cm^–1 at 93 K. The band shifts to lower frequency by ca. 20 cm^–1 in the presence of strongly adsorbed hydrogen, while it shifts to higher frequency by 50 cm^–1 when hydrogen is weakly adsorbed on the catalyst. The effects of the coexistence of hydrogen over the catalyst are discussed.