| abstract |
The invention relates to alumina agglomerates of the type obtained by dehydration of an aluminum hydroxide or oxyhydroxide, agglomeration of the alumina thus obtained, hydrothermal treatment of the agglomerates and calcination, characterized in that: - they have a specific surface between 90 and 220 m / g, preferably between 100 and 200 m2 / g; -they have a V37.ANG. between 40 and 65 ml / g, preferably between 45 and 60 ml / 100g; - they have a V200.ANG. greater than or equal to 12 ml / 100g, preferably greater than or equal to 15 ml / 100g, very preferably greater than or equal to 18 ml / 100g; and - they present a specific surface area ratio / V200.ANG. less than or equal to 10, preferably less than or equal to 8.5, very preferentially less or equal to 7. The invention also relates to a catalyst support, a adsorbent material and a catalyst constituted by such agglomerates. The invention also relates to processes for the preparation of these agglomerates. |