ALUMINA PELLETS, CATALYST SUPPORTS, CATALYSTS OR ABSORBENT CONTAINING SAME AND METHODS FOR PREPARING SAME

摘要

The invention concerns alumina pellets, obtained by dehydrating aluminium hydroxide or oxy-hydroxide, sintering the alumina thus obtained, subjecting the pellets to hydrothermal treatment and calcining, characterised in that: they have a specific surface ranging between 90 and 220 m<2>/g; they have a V37 ANGSTROM ranging between 40 and 65 ml/g, preferably between 45 and 60 ml/g; they have a V200 ANGSTROM not less than 12 ml/100g, preferably not less than 15 ml/100g, more preferably not less than 18 ml/100g; and they have a specific surface / V200 ANGSTROM ratio not more than 10, preferably not more than 8.5, more preferably not more than 7. The invention also concerns a catalyst support, an adosrbent material and a catalyst made of such pellets. The invention furthr concerns methods for preparing said pellets.