Support effects on iron(III) oxide catalyst in the reduction of nitrogen oxide with hydrogen

Abstract

Catalytic reduction of NO with H₂ has been carried out over Fe₂O₃ dispersed on ten kinds of supports. Among the carrier oxides, Fe₂O₃ on SiO₂ was the most effective catalyst and Fe₂O₃ on SnO₂ was least active. The surface states and adsorption states of NO on supported Fe₂O₂ were studied by means of i.r. and Mössbauer spectroscopies. The intensities of the i.r. bands at 1810 and 1735 cm^-1 of the adsorbed NO on reduced iron sites are discussed in connection with the catalytic activity.