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. 2020 Aug 24;142(37):15884–15896. doi: 10.1021/jacs.0c06270

Figure 6.

Figure 6

Exposure to NH3/He at 200 °C of Cu-CHA catalyst after step 3. (a) Cu K-edge XANES spectra. (b) Phase-uncorrected k2-weighted FT EXAFS curves. (c) Magnification of CuII 1s →3d transition. (d) UV-Vis-NIR DR spectra. Red thick line: spectrum collected in step 3 (same as Figures 2 and 3); blue thick line: after NH3/He exposure; gray thin lines: intermediates; dashed dark blue line : step 2 (NO/NH3 at 200 °C after pretreatment in O2, same as dark blue in Figures 2 and 3). (e) Illustration of Cu species proposed to be formed upon reaction of the μ-η2,η2-peroxo diamino dicopper(II) complexes with NH3. Atom color code: Cu, green; H, white; O, red; N, blue.