NH<sub>3</sub>‑SCR-DeNO<sub><i>x</i></sub> Activity of Cu-Containing Commercial Zeolite\nY

Commercial zeolite Y with different <i>n</i>(Si)/<i>n</i>(Al) ratios modified with copper cations were\nevaluated\nin the selective catalytic reduction of nitrogen oxide with ammonia\n(NH<sub>3</sub>-SCR-DeNO<sub><i>x</i></sub>). Among the\ninvestigated catalysts, the highest activity was achieved over CuY_CBV100\nwith 7.7 wt % of Cu. The activity of this sample was further confirmed\nin the feed of the tail gases stream from the pilot HNO<sub>3</sub> plant. The highest N<sub>2</sub> selectivity possesses CuY_CBV500\n(3.7 wt % of Cu). To improve catalytic properties, both zeolites were\nmixed before ion exchange with copper, as well as in a more effective\napproach, both Cu-containing catalysts were physically mixed (in different\nweight ratios, 1:1, 1:9, 3:7, 7:3). CuY_CBV100 is more active due\nto the presence of more active sites, available in reduction/oxidation\nhalf-cycles.