The catalytic activity of three different types of Cu 2+ exchanged zeolites (Cu ZSM 5, Cu Y, Cu M) for the NO direct decomposition, especially the effects of the preparation and reaction conditions on the catalytic activity have been studied.

Copper ion exchange technology is different from the traditional Ag~+-Na~+ and K~+-Na~+ ion exchange technology, because the doped copper in copper ion exchange waveguides not only results in refractive index change for ion exchange layer which comes into being waveguide, but also produces blue-green luminescence properties.