Method for preparing shaped porous inorganic materials, by reactive extrusion

Method for preparing a porous inorganic material having at least the following steps:

• a) Nucleation, growth, agglomeration and aggregation reactions of precursors of a mixture comprising at least one precursor of the oxide of a metal X in solution in a solvent and a precursor of the oxide of a metal Y at a temperature of between 30 and 70° C., X and Y being, independently, selected from the group consisting of aluminum, cobalt, indium, molybdenum, nickel, silicon, titanium, zirconium, zinc, iron, copper, manganese, gallium, germanium, phosphorus, boron, vanadium, tin, lead, hafnium, niobium, yttrium, cerium, gadolinium, tantalum, tungsten, antimony, europium and neodymium;
• b) mixing of the mixture obtained at the end of step a) at a temperature of between 80 and 150° C., the mixing period being adjusted so as to obtain a paste that exhibits a fire loss of between 20% by weight and 90% by weight at the end of this step;
• c) shaping of the porous inorganic material;
• steps a) to c) being performed within an extruder.