fig9

Figure 9. (A) Schematic of the cation exchanged ZSM-5 (H⁺@ZSM-5: fully proton exchanged ZSM-5, Sur-H⁺@ZSM-5: surface proton exchanged ZSM-5, Na⁺@ZSM-5: fully sodium exchanged ZSM-5, respectively; (B) TPA yield of the ZSM-5-based catalysts and their acidic site concentration plot. These figures are quoted with permission from Kang et al.^[93]; (C) Mechanism of PET methanolysis over MgO/NaY catalyst; (D) Correlation of DMT yield with strong BS on catalyst. These figures are quoted with permission from Tang et al.^[97]. TPA: Terephthalic acid; PET: polyethylene terephthalate; DMT: dimethyl terephthalate; BS: basic sites.