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The role of copper-oxide nanoparticles inside a host ZSM5 zeolite, identified by UV-Visible-NIR diffuse reflectance spectroscopy on the reactivity in NO reduction to N2in the presence of propane/O2or ammonia/O2is discussed. These species lead to an enhancement in the rate of alkane depletion in the reduction of NO in the presence of propane/O2, whereas they cooperate with isolated ions at exchangeable sites in determining the overall catalytic behaviour in NO reduction in the presence of ammonia/O2. Also the stability of these species depends on the type of reductant.