| abstract |
A process is described for preparing an inorganic material having hierarchical porosity in the fields of microporosity and mesoporosity, said material consisting of at least two elementary spherical particles having a maximum diameter of 200 microns, each of said spherical particles comprising metallic particles present within a mesostructured matrix based on silicon oxide, having microporous walls with a thickness between 1 and 60 nm, said process comprising the steps: a) the preparation of a solution containing zeolite nanocrystals of maximum nanometre size equal to 60 nm based on silicon and/or precursor elements of proto-zeolitic entities based on silicon, b) the mixing in solution of said metallic particles or of at least one metallic precursor of said metallic particles, of a surfactant and of said solution obtained according to a) such that the ratio of the volumes of inorganic material to organic material Vinorganic/Vorganic is between 0.29 and 0.50, c) atomization, via aerosol, of said solution obtained in step b) in order to result in the formation of spherical droplets, d) the drying of said particles, g) the removal of said structuring agent and of said surfactant. |