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a) 2D compositional map of the 13C content in needle 3 of a zeolite ZSM‐5 crystal after contacting it with 13C‐labeled methanol at 623 K for 90 minutes (see Figure 5 for details on the needle choice. b) 3 % 13C isoconcentration surface over all 13C (red) and Al (blue) ions. Needle max dimensions of 187×69×68 nm3. c) Compositional histogram across the 13C isoconcentration surface in b. Adapted from Ref. 70.
