Fig. 4: Influence of HCN on NH3-SCR activity and catalyst structure. | Nature Catalysis

Fig. 4: Influence of HCN on NH3-SCR activity and catalyst structure.

From: Tailoring the active sites in Cu-SSZ-13 as a catalyst for the selective catalytic reduction of NH3 to minimize HCHO and HCN emissions

Fig. 4

a, Conversion of NOx (dashed lines) and NH3 (solid lines) in the presence of HCN for Cu-SSZ-13 (7/1.3) (black lines) and Cu-SSZ-13 (14/1.3) (red lines) during NH3-SCR of NOx. b, Spatially resolved operando XANES measurements at the Cu K edge for Cu-SSZ-13 (7/1.3) (black lines) and Cu-SSZ-13 (14/1.3) (red lines) during steady-state SCR conditions in the presence of HCN at 300 °C. Position 1 was towards the inlet of the capillary reactor and position 5 was towards the outlet. The gas composition was 350 ppm NO, 350 ppm NH3, 100 ppm HCN, 0.5% H2O and 10% O2 in He.

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