Fig. 6. Relative fractions of framework-interacting Cu-species formed in He-activated Cu-CHA as a function of the catalyst composition (Z[Cu(ii)OH]: grey; ZCu(i): red; Z2Cu(ii): orange), evaluated from multi-component EXAFS fits (darker colours with error bars) and by MCR-ALS analysis of in situ XANES (lighter colours). Sample composition is indicated using (Cu/Al; Si/Al) labels.
