REDUCTION OF NO WITH NH3 ON Fe-Cr OXIDES CATALYST

A catalyst consisting of a mixture of Fe₂O₃ and Cr₂O₃ (5/1 atomic ratio of Fe:Cr) supported on alumina pellets was examined for the complete reduction of NO with NH₃ to N₂ in an isothermal flow reactor. The reduction of NO was determined at various inlet concentrations of NO (approximating utility boiler emissions) and NH₃, and catalyst bed temperatures. In the absence of O₂, NO reduced completely to N₂ without N₂O formation. Correlation of the kinetic data considering both external and internal reactant mass transfer provided the following rate expression for the reduction of NO, r = 7.71 × 10⁴ exp. ( - 12,300/RT) P^0.9_NO P^0.1_NH3, moles / g.cat-sec atm.