Reduction of Nitrogen Mouoxide by Active Carbon Fibers Impregnated with Metalic Salts

Abstract

Reduction of NO into N₂ was examined in a fixed bed flow reactor at 200∼350°C and W/F=1/50∼1/200 g°min/ml over PAN-ACF, Pitch-ACF and active carbon, and their Cu a nd Fe salts (5 wt%) supporting forms. PAN-ACF reduced NO at a conversion of 30% in the very initial stage at 350°C, but it lost activity rapidly to 10% within 3 h. Supporting the salts enhanced the reduction to give the stationary conversion of 55∼60%. Addition of O₂ to the reactant gases markedly increased the NO conversion to 82∼100% at 250°C, producing a large amount of CO₂ at the same time. Copper (II) acetate supported on PAN-ACF exhibited the highest reactivity at smaller carbon consumption. CO and propylene in the reactant gas suppressed the consumption of carbon with slight decrease of NO conversion. Copper (I) salts appeared to be reduced into copper(II) oxide on PAN-ACF at the reaction temperature to give the catalytic actibity. Best dispersion of the oxide from copper acetate on PAN-ACF may be the main reason for its best activity and selectivity