| abstract |
The present invention relates to having a median mesopore diameter by mercury porosimetry of 16 nm or greater, a mesopore volume by mercury porosimetry of 0.5 ml/g or greater, and greater than 0.75 ml/g Grams of amorphous mesoporous alumina with total pore volume measured by mercury porosimetry. The present invention also relates to a process for preparing said alumina, comprising: 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 Aluminium-containing, the pH of the aqueous reaction medium is 8.5 to 10.5, the temperature is 20°C to 90°C for 2 minutes to 30 minutes, the progress state of the first step is 5% to 13%; b) the step of heating the suspension c) a second step of precipitation by adding to the suspension at least one basic precursor and at least one acidic precursor, wherein at least one of the basic or acidic precursors comprises aluminium, the reaction medium has pH is 8.5 to 10.5, temperature is 40°C to 90°C for 2 minutes to 50 minutes, the progress state of the second step is 87% to 95%; d) filtration step; e) drying step; f) forming step; g ) heat treatment step. |