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TS-1/SiO 2 extrudate was post-treated with mixed solution of tetrapropyl ammonium hydroxide(TPAOH)and various ammonium salts solution(NH4F,(NH4)3PO4,(NH42CO3,(NH4)2SO4,NH4CH3CO2,NH4NO3,NH4Cl and(NH4)2TiF6).The obtained hierarchical TS-1 catalysts were cha