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Mesoporous γ-aluminas with large pore size (up to 19 nm,denoted as MA19) are prepared from dispersed pseudo-boehmite using pluronic P123 as template.It is found that these mesoporous alumina supported rhenium oxide catalysts were more active and have far longer working life-span in gas-phase metathesis of l-butene and 2-butene to propene than rhenium oxide on conventional alumina with small pore size (5 nm).At 60℃ and atmospheric pressure with WHSV=1 h-1,the similar stable conversions of butene (ca.55％) for all the 13 wt％ Re2O7/alumina catalysts were obtained near the chemical equilibrium,and the stable working life-spans of Re2O7/MA 19 were far longer than that of Re2O7/Al2O3,being about 70 h and 20 h,respectively.