Reaction of Nitrogen Oxides with Potassium-doped Carbons Modified with Ce and Mn under Simulated Exhaust Gases

Abstract

Reduction of NO was examined over the potassium-doped active carbon modified with Ce and Mn (K, Ce, Mn/C) in the presence and/or absence of O₂. NO is reduced at temperatures above 473K even in the absence of O₂, while the reduction of NO is enhanced at 473K in the presence of O₂. Twenty-five percent of NO was steadily reduced at 473K in the reaction of NO with K, Ce, Mn/C under simulated exhaust gas containing oxygen (2%). The NO conversions on both K, Ce/C and K, Mn/C were less than 10% under the same condition. Therefore, co-existence of Ce and Mn acts attractively for the steady reduction of NO to N₂ with carbon.