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US 9,108,190 B1Granted
Rapid synthesis of beta zeolites
AssigneeUniversity of Massachusetts
InventorsWei Fan, Chun-Chih Chang, Paul Dornath, Zhuopeng Wang
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Abstract
The invention provides methods for rapidly synthesizing heteroatom containing zeolites including Sn-Beta, Si-Beta, Ti-Beta, Zr-Beta and Fe-Beta. The methods for synthesizing heteroatom zeolites include using well-crystalline zeolite crystals as seeds and using a fluoride-free, caustic medium in a seeded dry-gel conversion method. The Beta zeolite catalysts made by the methods of the invention catalyze both isomerization and dehydration reactions.
Claims18
A method of synthesizing molecular sieves, said method comprising the steps of:
- a) preparing a seed solution comprising aluminosilicate zeolite beta nanocrystals,
- b1) dealuminating said nanocrystals,
- b2) preparing a suspension of the dealuminated nanocrystals without drying,
- c) preparing a solution comprising a structure directing agent and a heteroatom source,
- d) adding the suspension of dealuminated nanocrystals to the solution of step c),
- e) allowing a gel to form,
- f) heating said gel at a temperature and a time sufficient to form a solid,
- g) filtering, washing and drying said solid, and
- h) calcining said solid.
6 more elements
Dependencies are inferred from the claim text.