| 摘要 |
Process for the manufacture of a mesoporous product comprising the following successive steps:
a) preparation of a slip comprising:
a solvent,an additive,more than 4%, as percentage by volume based on the slip, of a powder formed of ceramic particles,b) oriented freezing of the slip, so as to form a block comprising ice crystals separated by walls,c) removal of the ice crystals from said frozen slip block, optionally removed from the mold, so as to obtain a porous preform,d) removal of the additive, so as to obtain a preformed mesoporous product,the additive and the amount of additive being chosen so that the additive is present in a mesopore-forming micellar phase in said walls,more than 25% by volume of said ceramic particles exhibiting a size less than twice the size of the micelles of said mesopore-forming micellar phase. |
| 主权项 |
1. A process for the manufacture of a mesoporous product comprising the following successive steps:
a) preparation of a slip comprising:
a solvent,an additive,more than 4%, as percentage by volume based on the slip, of a powder formed of ceramic particles, b) optionally, observation of a waiting time, c) optionally, pouring the slip into a mold and/or removal of air bubbles present in the slip, d) oriented freezing of the slip, so as to form a block comprising ice crystals separated by walls, e) optionally, removal of said frozen slip block from the mold, f) removal of the ice crystals from said frozen slip block, optionally removed from the mold, preferably by sublimation, so as to obtain a porous preform, g) removal of the additive, so as to obtain a preformed mesoporous product or “preform”, h) optionally, sintering of the porous preform obtained at the end of step f) or g), so as to obtain a sintered mesoporous product, i) optionally, machining and/or impregnating said sintered mesoporous product, it being possible for the ceramic particles to be partially or completely replaced by equivalent amounts of precursors of particles, the process being adjusted in order for said precursors of particles to be converted into ceramic particles before step g), the additive, referred to as “mesopore-forming additive”, and the amount of additive being chosen so that the additive is present in a mesopore-forming micellar phase in said walls, preferably in an organized mesopore-forming micellar phase, more than 25% by volume of said ceramic particles exhibiting a size less than twice the size of the micelles of said mesopore-forming micellar phase. |
