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Reconstructed needle of an aged zeolite Cu‐ZSM‐5 with 5 % Cu (red) and 8 % Al (blue) isoconcentration surfaces shown, bounding box dimensions are 15×15×43 nm3. The Al/Cu and O/Cu ratios across the 8 % Al isoconcentration surface are in good agreement with the stoichiometry of Cu aluminate spinel, CuAl2O4, which is indicated on each graph by the dotted line. Adapted from Ref. 64.
