AMORPHOUS MESOPOROUS AND MACROPOROUS ALUMINA WITH AN OPTIMIZED PORE DISTRIBUTION, AND PROCESS FOR ITS PREPARATION

摘要

The invention concerns a process for the preparation of an amorphous mesoporous and macroporous alumina, comprising at least one step for dissolving an acidic precursor of aluminium, a step for adjusting the pH by adding at least one basic precursor to the suspension obtained in step a), a step for co-precipitation of the suspension obtained at the end of step b) by adding at least one basic precursor and at least one acidic precursor to the suspension, a filtration 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 pore structure having:a specific surface area S_BET of more than 100 m²/g;a median mesopore diameter, by volume determined by mercury intrusion porosimetry, of 18 nm or more;a median macropore diameter, by volume determined by mercury intrusion porosimetry, in the range 100 to 1200 nm, limits included;a mesopore volume, as measured by mercury intrusion porosimetry, of 0.7 mL/g or more;and a total pore volume, as measured by mercury porosimetry, of 0.8 mL/g or more.