Fig. 3: Operando XANES measurements along the catalyst bed during NH3-SCR of NOx. | Nature Catalysis

Fig. 3: Operando XANES measurements along the catalyst bed during NH3-SCR of NOx.

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. 3

a–d, Spatially resolved XANES data collected at the Cu K edge for Cu-SSZ-13 (7/1.3) (a and c) and Cu-SSZ-13 (14/1.3) (b and d) catalysts under steady-state SCR conditions in the absence (black lines) and presence (red lines) of formaldehyde at 300 °C (a and b) and 450 °C (c and d). Position 1 (Pos 1) was towards the beginning of the catalyst bed in the quartz capillary microreactor and position 5 was towards the end of the catalyst bed. The gas composition was 350 ppm NO, 350 ppm NH3, 0–100 ppm HCHO, 0.5% H2O and 10% O2 in He.

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