Abstract. It is shown that Ag/Al 2 O 3 is a unique catalytic system for H 2 -assisted selective catalytic reduction of NO x by NH 3 (NH 3 -SCR) with both Ag and alumina being necessary components of the catalyst. The ability of Ag/Al 2 O 3 and pure Al 2 O 3 to catalyse SCR of mixtures of NO and NO 2 by ammonia is demonstrated, the surface species occurring discussed, and a "Fast SCR"-like mechanism of the process is proposed. The possibility of catalyst surface blocking by adsorbed NO x and the *Revised Manuscript Click here to view linked References 2 influence of hydrogen on desorption of NO x were evaluated by FTIR and DFT calculations.

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