fig3
From: Recent advances in shape selectivity of MFI zeolite and its effect on the catalytic performance

Figure 3. Schematic diagram of Cr2O3 distribution on ZSM-5 and directional (A), nondirectional (B) spatial pathway of aromatics generation of intermediate species C1* in ZSM-5 zeolite channels. The figure is used with permission from Elsevier[38].