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A) 6K Mössbauer spectra of α-Fe(IV)=O in *BEA (red) and CHA (black). B) 6K Mössbauer spectra after the reaction of α-Fe(IV)=O with CH4 in *BEA (red) and CHA (black). Mössbauer parameters and speciation parameters are in the tables in the Figure. Reproduced from ref 32. Copyright 2021 Science.
