Zeolites with hierarchical porosity
View Patent ↗The present invention concerns zeolites with hierarchical porosity having a molar ratio Si/Al of between 1 and 1.4, inclusive, of which the average diameter, as a number, is between 0.1 μm and 20 μm, having controlled and optimized crystallinity, and having mesoporosity such that the mesoporous outer surface area is between 40 m 2 ·g −1 and 400 m 2 ·g −1 . The present invention also concerns the method for preparing said zeolites with hierarchical porosity.
1. A hierarchically porous zeolite in the form of crystals having at least the following characteristics:
Si/AI mole ratio of between 1 and 1.4, limits inclusive,
a numerical mean diameter of the crystals of between 0.1 μm and 20 μm, limits inclusive, and
mesoporosity such that the mesoporous outer surface area is between 40 m 2 ·g −1 and 400 m 2 ·g −1 ,
wherein the hierarchically porous zeolite comprises a pure zeolite phase, and has a micropore volume Vμp which satisfies the equation Vμp=Vμp R ±15%, where Vμp R represents the micropore volume measured, under the same conditions, for a zeolite of the same chemical nature and of the same crystal structure, but having a mesopore outer surface area which is less than 40 m 2 ·g −1 .
2. The zeolite according to claim 1 , wherein the zeolite is an FAU zeolite, or an LTA zeolite.
3. The zeolite according to claim 1 , wherein the zeolite is a zeolite X, zeolite MSX, zeolite LSX, or zeolite EMT.
4. The zeolite according to claim 1 , wherein the zeolite is a zeolite X.
5. The zeolite according to claim 1 , wherein the zeolite is a zeolite MSX.
6. The zeolite according to claim 1 , wherein the zeolite is a zeolite LSX.
7. The zeolite according to claim 1 , wherein the zeolite is an LTA zeolite.
8. The zeolite according to claim 1 , wherein the micropore volume Vμp satisfies the equation Vμp=Vμp R ±10%.
9. The zeolite according to claim 1 , wherein the micropore volume Vμp satisfies the equation Vμp=Vμp R ±5%.
10. The zeolite according to claim 1 , wherein the mesoporous outer surface area is between 60 m 2 ·g −1 and 200 m 2 ·g −1 .
11. The zeolite according to claim 1 , wherein the numerical mean diameter of the crystals is between 0.1 μm and 10 μm.
12. The zeolite according to claim 1 , wherein the numerical mean diameter of the crystals is between 0.5 μm and 10 μm.
13. The zeolite according to claim 1 , wherein the numerical mean diameter of the crystals is between 0.5 μm and 5 μm.