The influence of the amount of pseudo-boehmite binder on the catalytic properties of dealuminated mordenite(MOR)catalyst for Friedel-Crafts alkylation was investigated.Solid-state 27Al MAS NMR spectroscopy,temperature-programmed desorption of ammonia(NH3-TPD),BET surface area measurement and catalyst particle mechanical strength were used to characterize the catalysts.It was observed that the addition of pseudo-boehmite binder results in slight changes in texture parameters of the catalyst but an obvious increase in its mechanical strength.Some soluble Al species from the binder might migrate into the mordenite framework during calcination so as to produce some acid sites of moderate intensity,which consequently increases the acid amount of the catalyst.Among these catalysts studied,the catalyst bound with 10 wt.%pseudo-boehmite binder showed the best catalytic performance in terms of yield and stability,which can be attributed to its maximum medium strong acid amount and its structural properties which is favorable for fast diffusion of products.