| abstract |
The present invention provides a mesopore diameter median by volume determined by mercury intrusion porosimetry above 16 nm, a mesopore volume as measured by mercury intrusion porosimetry above 0.5 mL / g, and 0. It relates to amorphous mesoporous alumina with a total pore volume measured by mercury porosimetry of more than 75 mL / g. The invention also provides a) a first step for precipitating at least one basic precursor and at least one acidic precursor, wherein at least one of the basic or acidic precursors comprises aluminum. Including an aqueous reaction medium pH in the range of 8.5 to 10.5, a temperature in the range of 20 ° C to 90 ° C, and a period in the range of 2 minutes to 30 minutes. A first step having a rate of progress of one step; b) a step for heating the suspension; c) at least one basic precursor and at least one acidic precursor in the suspension. A second step for precipitation by addition, wherein at least one of the basic or acidic precursors comprises aluminum, the pH of the reaction medium in the range of 8.5 to 10.5, Temperature in the range of 90 ° C. and period in the range of 2 minutes to 50 minutes Said alumina comprising: a second step having a progress rate of the second step ranging from 87% to 95%; d) a filtration step; e) a drying step; f) a molding step; g) a heat treatment step Relates to a process for preparing |