REACTION OF NITRIC-OXIDE WITH METAL-LOADED CARBON IN THE PRESENCE OF OXYGEN

The effective removal of a low concentration of nitric oxide can be relaized by using carbon as a reducing agent. The C-NO reaction was catalyzed by metal loaded on coal-char both in the presence and in the absence of oxygen. This C-NO reaction was remarkably promoted by the presence of oxygen at temperatures as low as 300-degrees-C. The ratio of the activity for NO(x) decomposition to that for carbon combustion in the coexistence of nitric oxide and oxygen depended on the kind of metal catalyst. The order of catalytic activity was Cu > Ca > Ni > none for the C-NO reaction, but Ca > Cu > Ni > none for the C-O2 reaction. This result suggests a possible means of finding a suitable metal catalyst which can strongly promote only the C-NO reaction. A high conversion for the C-NO reaction in the presence of oxygen was achieved by copper-loaded brown coal-char.