| abstract |
A process for the preparation of an amorphous mesoporous and macroporous alumina: at least once dissolving an acidic precursor of aluminium, adjusting pH by adding at least one basic precursor to the suspension obtained in a), co-precipitation of the suspension obtained from b) by adding at least one basic precursor and at least one acidic precursor to the suspension, filtration, drying, shaping and heat treatment. n An amorphous mesoporous and macroporous alumina with bimodal pore structure:n a specific surface area S BET more than 100 m 2 /g; a median mesopore diameter, by volume determined by mercury intrusion porosimetry, 18 nm or more; a median macropore diameter, by volume determined by mercury intrusion porosimetry, 100 to 1200 nm, limits included; a mesopore volume, as measured by mercury intrusion porosimetry, 0.7 mL/g or more; and a total pore volume, as measured by mercury porosimetry, 0.8 mL/g or more. |