摘要： Effects of hydrochloride acid dealumination of mordenite catalysts on the synthesis of 1-phenyl-1-xylyl ethane (PXE) were investigated. The structure and acidities of catalysts were characterized by techniques of XRD, BET, XRF, FT-IR, 27Al NMR and NH3-TPD. The catalytic performances of the acid-treated MOR zeolites were discussed using the alkylation of o-xylene and styrene. The results showed that the strength of remaining Br?nsted acid sites increased although the total number of acid sites decreased after dealumination, and the micropores of HMOR slightly enlarged followed by the formation of secondary mesopores. Additionally, the modified HMOR zeolites showed longer catalyst life with retaining styrene conversion. Among the catalysts employed in this study, the modified mordenite that was dealuminated by HCl (2 M) could be used repeatedly without significantly loss of activity and selectivity during six catalytic runs, which have been related to its acidity and structural properties.