Zeolite Beta Polymorph-A Enrichment via Hydrothermal Dilution
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Solution Overview
Problem
Conventional methods for producing polymorph-A enriched zeolite beta materials are complex and expensive, often requiring the use of chiral reagents or highly corrosive compounds.
Innovation Solution
A method involving the addition of a parent zeolite beta to a basic solution, followed by dilution and hydrothermal treatment, to produce zeolite beta materials with a greater molar ratio of polymorph-A to polymorph-B, without the need for complex reagents or procedures.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If conventional methods are used to make polymorph-A enriched zeolite beta materials, then the molar ratio of polymorph-A to polymorph-B is increased, but the process complexity and cost increase due to requiring chiral reagents or highly corrosive compounds
Solution Approach 1:
The patent removes the need for complex chiral reagents and highly corrosive compounds from the synthesis process. Instead, it uses a simple basic solution (containing compounds like urea, ammonium hydroxide, or sodium hydroxide) to achieve polymorph-A enrichment, thereby extracting the harmful and complex elements while retaining the desired outcome.
Solution Approach 2:
The patent changes the chemical environment parameters by introducing a basic solution with specific pH conditions (pH 9-14) to the zeolite beta synthesis. This parameter change (making the solution basic) triggers the selective formation or stabilization of polymorph-A, achieving enrichment without complex reagents. The basic conditions alter the crystallization pathway to favor the chiral polymorph.
2Manufacturing precision
If conventional methods are used to make polymorph-A enriched zeolite beta materials, then the molar ratio of polymorph-A to polymorph-B is increased, but the cost increases due to expensive reagents and procedures
Solution Approach 1:
The patent replaces expensive chiral reagents and corrosive compounds with inexpensive, readily available basic compounds such as urea, ammonium hydroxide, or sodium hydroxide. These cheap basic agents achieve the same polymorph-A enrichment effect, dramatically reducing material costs while simplifying the manufacturing process.
3Manufacturing precision
If conventional methods are used to make polymorph-A enriched zeolite beta materials, then the molar ratio of polymorph-A to polymorph-B is increased, but hazardous reagents are required
Solution Approach 1:
The patent converts the potentially harmful use of highly corrosive compounds into a beneficial process by using mild basic solutions. Instead of employing dangerous reagents that require special handling and safety protocols, the invention uses benign basic compounds (urea, ammonium hydroxide, sodium hydroxide) that are safer to handle while still achieving polymorph-A enrichment through pH-controlled crystallization.
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
This method effectively increases the molar ratio of polymorph-A to polymorph-B in the resulting zeolite beta materials, potentially enhancing their chemical properties such as shape selectivity and enantioselectivity, while avoiding the use of costly and hazardous reagents.
Implementation Method 1
adding a parent zeolite beta in a basic solution to form a basic zeolite beta suspension; adding water to the basic zeolite beta suspension to form a dilute basic zeolite beta suspension; hydrothermally treating the dilute basic zeolite beta suspension to form a hydrothermally treated mixture
Implementation Method 2
hydrothermally treating the dilute basic zeolite beta suspension to form a hydrothermally treated mixture
Data Source
AI summary
According to one or more embodiments, a zeolite beta material may be made by a method that may include adding a parent zeolite beta in a basic solution to form a basic zeolite beta suspension, adding water to the basic zeolite beta suspension to form a dilute basic zeolite beta suspension, hydrothermally treating the dilute basic zeolite beta suspension to form a hydrothermally treated mixture, and separating from the hydrothermally treated mixture a solid zeolite beta material consisting essentially of polymorph-A and polymorph-B. The molar ratio of polymorph-A to polymorph-B of the solid zeolite beta material may be greater than molar ratio of polymorph-A to polymorph-B of the parent zeolite beta.