| abstract |
The invention concerns a method for preparing an amorphous mesoporous and macroporous alumina, comprising at least one step of dissolving an acid precursor of aluminium, a step of adjusting the pH by adding, to the suspension obtained in step a), at least one basic precursor, a step of co-precipitating the suspension obtained at the end of step b) by adding, to the suspension, at least one basic precursor and at least one acid precursor, a filtering step, a drying step, a shaping step and a heat treatment step. The invention also concerns an amorphous mesoporous and macroporous alumina with a bimodal porous structure having: a specific surface area S BET greater than 100 m 2 /g, a mesoporous median diameter by volume determined by mercury intrusion porosimetry greater than or equal to 18 nm, a macroporous volume median diameter determined by mercury intrusion porosimetry of between 100 and 1200 nm, terminals included; a mesoporous volume as measured by mercury intrusion porosimetry, greater than or equal to 0.7 ml/g, and a total porous volume as measured by mercury porosimetry greater than or equal to 0.8 ml/g. |