The invention relates to a method for reducing the concentration of nitrogen oxides (10) in a flue gas stream (12) of a combustion reaction (18) by selective catalytic reduction, SCR, with the following method steps: a) providing a catalyst precursor (14), b) producing a catalyst (16) from the catalyst precursor (14), wherein the catalyst (16) produced comprises nanoparticles, c) feeding the catalyst (16) produced to the flue gas stream (12), d) feeding ammonia (22), NH3, or an ammonia precursor to the Flue gas flow (12) as reducing agent (22), and e) reducing the concentration of nitrogen oxides (10) of the flue gas flow (12) by means of a first SCR by means of the catalyst (16) and the reducing agent (22) in the flue gas flow (12), the method step b) comprises feeding the catalyst precursor (14) to the combustion reaction (18) or feeding the catalyst precursor (14) to a supporting combustion reaction (20). In this way, a method is made available which has a high degree of efficiency in reducing the concentration of nitrogen oxides in the flue gas flow.
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