Selective removal of NO by NH₃ on natural zeolite from Young-il, Korea with various copper loadings(CuNZA) has been studied in a packed bed flow reactor system with simulated flue gas. Two orders of magnitude in-crease in the reaction rate were achieved by the addition of copper ions to the catalyst. The first order, irreversible kinetic model with respect to NO concentration adequately fits experimental data for this reaction system as did for synthetic mordenite zeolite system(CuHM)over the low reaction temperature(200-300℃)covered, independent fo the copper level. The optimum copper content is aboue 3wt%. It is expected that CuNZA catalyst will have stronger sulfur tolerance than CuHM because of its typical physical properties such as surface area, pore size distribution and Si/Al ratio.