Hollow catalyst carrier and hollow catalyst made of transition-alumina and process for production thereof

摘要

A hollow catalyst carrier and hollow catalyst made of a transition-alumina (e.g. gamma -alumina) which comprises a calcined product having a pipe-like or multi-cell structure and having a very large void ratio (i.e. not less than 3%), a very large specific surface area (i.e. not less than 5 m2/g), a bulk density of 0.8 to 1.8 g/cm3, a compressive strength in the extrusion direction of not less than 20 kg/cm2 and at least one hole in the extrusion direction, and a process for the production thereof by subjecting a powder containing a rehydratable alumina to an extrusion molding, rehydrating the molded product and followed by calcining. The hollow catalyst carrier and hollow catalyst have excellent properties for carrying the catalytically active components thereon and have an excellent mechanical strength.