C - Chemistry – Metallurgy – 01 – B
Patent
C - Chemistry, Metallurgy
01
B
C01B 37/00 (2006.01) B01D 53/56 (2006.01) B01D 53/86 (2006.01) B01D 53/94 (2006.01) B01J 21/06 (2006.01) B01J 23/10 (2006.01) B01J 29/04 (2006.01) B01J 35/00 (2006.01) C01F 17/00 (2006.01) C01G 23/04 (2006.01) C01G 23/047 (2006.01) C01G 25/02 (2006.01)
Patent
CA 2394144
The invention concerns a method for preparing a controlled mesoporous or mesostructured material, heat stable and at least partly crystallised, said method comprising steps which consist in: (A) forming an initial dispersion comprising: (1) at least partly crystalline colloidal particles of nanometric dimensions, whereof at least 50 % of the population has a mean diameter ranging between 1 and 40 nm, and (2) a texturizer; (B) concentrating the resulting dispersion so as to obtain a solid by texturization and gradual aggregation of the colloidal particles; and (C) eliminating the texturizer in the resulting solid. The invention also concerns the partly crystalline and heat stable mesostructured products obtained by said method. The invention further concerns mesostructured materials, at least partly crystalline and heat stable, consisting essentially of a cerium, zirconium and/or titanium oxide. Said materials can be used in particular in catalysis.
L'invention concerne un procédé de préparation d'un matériau mésoporeux ordonné ou mésostructuré, thermiquement stable et au moins partiellement cristallisé, ledit procédé comprenant les étapes consistant à: (A) former une dispersion initiale comprenant; (1) des particules colloïdales de dimensions nanométriques au moins partiellement cristallines, dont au moins 50 % de la population possède un diamètre moyen compris entre 1 et 40 nm; et (2) un agent texturant; (B) concentrer la dispersion obtenue de façon à obtenir un solide par texturation et consolidation progressive des particules colloïdales; et (C) éliminer l'agent texturant dans le solide obtenu. L'invention concerne également les matériaux mésostructurés, partiellement cristallins et thermiquement stables préparés selon ce procédé. L'invention concerne aussi des matériaux mésostructurés, au moins partiellement cristallins et thermiquement stables, composés essentiellement d'un oxyde de cérium, de zirconium et/ou de titane. Les matériaux de l'invention peuvent être utilisés notamment dans le domaine de la catalyse.
Chane-Ching Jean-Yves
Cobo Frederic
Rhodia Chimie
Robic
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