“…In order to obtain an efficient PET glycolysis catalyst, we screened a series of representative metal ions (Nb, 26 Ti, 27 Zn, 28,29 Sn (ref. [30][31][32]) with Lewis acidity and doped them in SBA-15 to depolymerize PET. It is important to note here that after doping with different metal ions, the textural properties and acid strength of these catalysts are similar.…”