Carbonaceous materials are not suitable catalysts for direct NO decomposition in exhaust aftertreatment

Abstract

Carbonaceous materials have been suggested as catalysts for direct NO decomposition. In contrast to previous reports, it is demonstrated herein that even graphitic carbon nitride (g-CN) (stable in air up to 600 °C; valence band potential of 1.9 V) is not a catalyst but instead reacts stoichiometrically with NO to form isocyanic acid at temperatures higher than 450 °C.