An exhaust gas denitrifying system having a noise-reduction structure includes a reactor in which a chemical reaction that converts nitrogen oxides included in exhaust gas into nitrogen by denitrifying the nitrogen oxides using a catalyst takes place. The reactor includes a catalytic filter unit coated with a catalyst and provided with a plurality of through-holes through which exhaust gas passes; and a noise-reducing unit for removing noise from the exhaust gas denitrified by the catalytic filter unit. The reactor denitrifies the nitrogen oxides, and simultaneously reduces the noise, thus reducing the size of the exhaust gas denitrifying system.
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