Preparation of mesoporous alumina with large pore size and their supported rhenium oxide catalysts in metathesis of 1-butene and 2-butene to propene

Abstract

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 1-butene and 2-butene to propene than rhenium oxide on conventional alumina with small pore size (5 nm). At 60°C 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/MA19 were far longer than that of Re₂O₇/Al₂O₃, being about 70 h and 20 h, respectively.