A Kinetic Study on the Reaction of Carbon with NO

抄録

The emission of NOx from coal-fired industrial boilers and automobile engines has become a serious environmental problem all around the world. The demand of an economical denitrification method is in great urgent especially in some developing countries. The methods of using various kinds of carbon to absorb and adsorb the flue-gas-NOx have been studied for years. In this study, sodium compounds were used as catalyst for the reaction of carbon and NO. Experiments were performed over the temperature range 400-700°C and the NO concentration range 50-1000ppm. With changing the parameters of temperature and NO concentration the activation energy, reaction order and the rate constant of the reaction with each kind of catalyst was calculated respectively. In this study, two kinds of sodium compounds, Na₂CO₃ and NaOH were tested. For the reaction with Na₂CO₃ as catalyst, the activation energy is determined to be 80 [kJ] and the reaction order of NO is 0.8. When NaOH was used as catalyst, the reaction system becomes complex, because NaOH is not steady under our experimental conditions. The activation energy was found to shift from 33 [kJ] to 120 [kJ] at 500°C, indicating some reactions of NaOH at 500°C. The over all reaction order of NO in this reaction system is determined to be 0.9.