Catalytic Performance of Micro-/micro-mesoporous H-ZSM-5 Zeolites for Alkylation of Toluene with Methanol

The effects of acid or alkali treatments as well as acid-alkali treatment on the physicochemical properties and catalytic performances in the alkylation of toluene with methanol over H-ZSM-5 zeolites with different Si/Al ratios were investigated. The zeolites before and after the treatment were characterized by XRD, NH3-TPD, BET and TEM. The results indicated that the acid and alkali treatment had the great effects on the acidity and pore structure of the zeolites, which can directly influence the catalytic activities of the zeolites. Acid treatment can greatly influence the acidity and catalytic activities of H-ZSM-5 with lower Si/Al ratios, while alkali treatment only had the great effects on H-ZSM-5 with higher Si/Al ratios-The combination of acid and alkali treatment can adjust the acidity and pore structures of the zeolites simultaneously, and then enhance the catalytic activity in the alkylation of toluene with methanol.