Activated alumina formed body and method for producing the same

Abstract

An activated alumina formed body with a high bulk density and a large macro-pore volume is provided. The activated alumina formed body can be produced by a method comprising the steps of calcining a gibbsite-phase aluminum hydroxide having a median particle size of from about 10 μm to about 35 μm and a packed bulk density of from about 1.05 g/cm 3 to about 1.3 g/cm 3 to obtain an at least partially rehydratable alumina powder; forming the rehydratable alumina powder in the presence of water; maintaining the formed body in the presence of water to rehydrate the formed body; and calcining the rehydrated formed body to obtain an activated alumina formed body. The activated alumina formed body is usable as an adsorbent, a catalyst supporting precious metal or the like.

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       3 . An activated alumina formed body having macro pores with a radius of about 0.3 μm or more, a total volume of the macro pores of about 0.05 cm 3 /g or more, a packed bulk density of about 0.65 g/cm 3  or more, a crushing strength of about 100 daN/cm 2  or more and a BET specific surface area of about 100 m 2 /g or more.