*BEA Zeolite Synthesis Using Dicationic Pyrrolidinium Template
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Solution Overview
Problem
There is a need for new zeolites with desirable properties, as well as new structure directing agents and more efficient methods for the synthesis of new or modified zeolites.
Innovation Solution
A method for making crystalline materials of *BEA framework type using a synthesis mixture comprising water, sources of silicon and aluminum oxides, 1,1-(pentane-1,5-diyl)bis(1-propylpyrrolidinium) dication as a structure directing agent, and hydroxide ions, heated under crystallization conditions to form crystals, which can then have the structure directing agent removed.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Area of stationary object
If conventional synthesis methods are used to prepare *BEA framework type zeolites, then the crystallization process requires long time periods, but the external surface area of the resulting zeolites is limited
Solution Approach 1:
The patent changes the chemical parameters of the synthesis mixture by introducing a specific structure directing agent (1,1-(pentane-1,5-diyl)bis(1-propylpyrrolidinium) dication) and adjusting the molar ratios of components (SiO2/Al2O3, Q/SiO2, OH/SiO2, H2O/SiO2). These parameter changes enable the formation of zeolite crystals with higher external surface area and shorter crystallization time compared to conventional methods.
Solution Approach 2:
The structure directing agent (Q) acts as an intermediary compound that mediates the crystallization process. The specific dicationic pyrrolidinium compound serves as a template that directs the formation of *BEA framework type zeolites with enhanced external surface area and controls the crystallization kinetics to reduce processing time.
2Productivity
If existing structure directing agents are used for zeolite synthesis, then the synthesis method lacks efficiency, but new structure directing agents require development and optimization
Solution Approach 1:
The patent optimizes the synthesis method by establishing specific molar ratio ranges for the synthesis mixture components (SiO2/Al2O3: 10-200, Q/SiO2: 0.01-1.0, OH/SiO2: 0.05-1.5, H2O/SiO2: 1-80). These parameter optimizations improve synthesis efficiency while maintaining manageable method complexity through systematic formulation.
3Reliability
If conventional synthesis mixtures are used, then zeolites with improved properties cannot be obtained, but modified compositions require precise control of multiple parameters
Solution Approach 1:
The patent modifies the synthesis mixture composition by incorporating a specific structure directing agent and defining precise molar ratio ranges for all components. This systematic parameter control ensures reliable production of zeolites with improved properties while providing clear guidelines for composition control to manage manufacturing precision requirements.
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 allows for the efficient preparation of *BEA framework type zeolites with improved properties, such as higher external surface area and shorter crystallization times compared to existing methods.
Implementation Method 1
heating said synthesis mixture under crystallization conditions including a temperature of from 100 to 200° C. for a time sufficient to form crystals of said material
Data Source
AI summary
The present disclosure relates to a method of making crystalline materials of *BEA framework type. The present disclosure also relates to crystalline materials of *BEA framework type obtainable by said method and uses thereof. The method of making includes using 1,1-(pentane-1,5-diyl)bis(1-propylpyrrolidinium) dication as a structure directing agent for forming the crystalline materials of *BEA framework type.