The reduction of NO by carbonaceous solid has been studied in a packed bed reactor. After an initial transient, a steady rate of NO reduction is observed with N₂, CO and CO₂ as the dominant products. Kinetic parameters of the reaction were obtained for various NO and CO concentrations, temperatures, and carbon types. The reaction rate per unit total surface area is found to be first order in NO, to have an apparent activation energy of 44 kcal/mole for temperatures higher than 873K, to be enhanced by the presence of CO, and to vary by approximately an order of magnitude between graphite and coal chars.