“…In various studies on the so called ex-framework Fe-ZSM-5 [20] it was never excluded that these particles are of importance to the N 2 O decomposition catalysis. Also the presence of Al in these particles appeared likely, and this led indirectly to the proposal that Al in vicinity of Fe is beneficial for the catalysis [35]. Because of the different nature of the nano-particles in steamed ZSM-5 catalysts and TUD-1 catalysts, conclusions related to the former system cannot be made.…”