Process for preparing an inorganic monolith with multi-scale porosity

Abstract

The present invention relates to a process for preparing a multi-scale porosity inorganic monolith comprising: a) an emulsification step of an oily phase in an acidic aqueous phase, in which: a1) the aqueous phase comprises at least one acid, at least one surfactant and at least one inorganic precursor; a2) the oily phase is added to the mixture obtained in step a1); a3) the mixture obtained in step a2 is subjected to mechanical rotary agitation, preferably at a rotational speed greater than 100 revolutions per minute, in order to obtain an emulsion; b) a polycondensation step of the emulsion obtained in step a3, preferably for 1 to 20 days, in order to obtain a gel; c) a drying step of the gel obtained in step b);d) a first calcination stage at a temperature between 160°C and 200°C, with a heating rate between 0.5 and 3°C / min, the plateau being maintained for a period of 2 to 6 hours, preferably for 3 hours; and e) a second calcination stage at a temperature between 300°C and 900°C, preferably between 400°C and 800°C, with a heating rate between 0.5 and 2°C / min, the plateau being maintained for 3 to 8 hours, preferably for 7 hours.