US11046586B2 · US · B2
| Field | Value |
|---|---|
| Publication number | US-11046586-B2 |
| Application number | US-202016852169-A |
| Country | US |
| Kind code | B2 |
| Filing date | Apr 17, 2020 |
| Priority date | Dec 30, 2014 |
| Publication date | Jun 29, 2021 |
| Grant date | Jun 29, 2021 |
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Compositions and methods for preparing mesoporous and/or mesostructured materials from low SAR zeolites are provided herewith. In particular, methods are provided that involve: (a) providing a low SAR zeolite, (b) optionally subjecting the low SAR zeolite to an acid framework modification, and (c) subjecting the framework-modified zeolite to a mesopore formation treatment. The resulting mesoporous zeolites can have bi-modal mesoporosity and higher aluminum contents relative to existing mesoporous zeolites.
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What is claimed is: 1. A low SAR zeolite, wherein said low SAR zeolite is selected from the group consisting of a ZSM-5 having a silica to alumina molar ratio of 17 or less, wherein said low SAR zeolite has a total 20 to 300 A diameter mesopore volume of at least 0.08 cc/g and a dV/log(d) of at least 0.19. 2. The low SAR zeolite of claim 1 , wherein said low SAR zeolite has a mesopore ratio in the range of 0.1 to 0.9. 3. The low SAR zeolite of claim 1 , wherein said low SAR zeolite has a total 20 to 300 Å diameter mesopore volume in the range of 0.10 to 0.70 cc/g. 4. The low SAR zeolite of claim 1 , wherein said low SAR zeolite has a dV/log(d) in the range of 0.3 to 100 and a mesopore ratio in the range of 0.2 to 1.2. 5. A mesoporous zeolite, comprising a ZSM-5 zeolite having a silica to alumina molar ratio of 17 or less, wherein said mesoporous zeolite has a dV/log(d) in the range of 0.3 to 100, a mesopore ratio in the range of 0.2 to 1.2, and a total 20 to 300 A diameter mesopore volume of at least 0.08 cc/g. 6. The mesoporous zeolite of claim 5 , wherein said mesoporous zeolite has a crystalline content of at least 20 weight percent as measured by XRD. 7. The mesoporous zeolite of claim 5 , wherein said mesoporous zeolite has a total 20 to 80 Å diameter mesopore volume of at least 0.05 cc/g. 8. The mesoporous zeolite of claim 5 , wherein said mesoporous zeolite has a total 20 to 300 Å diameter mesopore volume of at least 0.10 cc/g. 9. The low SAR zeolite of claim 5 , wherein said mesoporous zeolite is said ZSM-5 having a silica to alumina molar ratio in the range of 2 to 16.
After-treatment · CPC title
using at least one organic template directing agent; Hexagonal faujasite; Intergrowth products of cubic and hexagonal faujasite · CPC title
Type L · CPC title
of the pentasil type, e.g. types ZSM-5, ZSM-8 or ZSM-11, as exemplified by patent documents US3702886, GB1334243 and US3709979, respectively · CPC title
Faujasite type, e.g. type X or Y · CPC title
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