SSZ-82 Borosilicate Zeolite Synthesis Using Organic Structure-Directing Agent
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Solution Overview
Problem
There is a continuous need for new crystalline molecular sieves with desirable properties for gas separation and hydrocarbon conversions, as existing sieves may lack enhanced selectivities and novel internal pore architectures.
Innovation Solution
The development of crystalline molecular sieve SSZ-82, prepared using 1,6-bis(N-cyclohexylpyrrolidinium)hexane dication as a structure directing agent, involves a method that includes hydrothermal crystallization and post-synthesis treatments like heteroatom lattice substitution to achieve the target zeolite composition and structure.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If existing molecular sieves are used, then current catalytic and separation functions are provided, but enhanced selectivities and novel internal pore architectures are not achieved
Solution Approach 1:
The patent changes the chemical composition parameters by incorporating boron into the molecular sieve framework (creating borosilicate zeolite SSZ-82), which fundamentally alters the pore architecture and selectivity properties while maintaining structural stability and catalytic performance
Solution Approach 2:
The invention creates a composite material system by combining boron and silicon in a specific ratio within the zeolite framework, achieving novel pore structures that provide enhanced selectivity while maintaining reliable catalytic and separation functions
2Adaptability or versatility
If new molecular sieve structures are developed, then enhanced selectivities and novel pore architectures are achieved, but synthesis complexity and processing steps increase
Solution Approach 1:
The patent employs preliminary action by using a pre-designed organic structure-directing agent (1,6-bis(N-cyclohexylpyrrolidinium)hexane dication) that guides the formation of the desired borosilicate SSZ-82 pore structure during crystallization, simplifying the synthesis of this complex novel material
Solution Approach 2:
The organic dication acts as an intermediary structure-directing agent that mediates the formation of the complex borosilicate framework, enabling the creation of novel pore architectures through hydrothermal crystallization without requiring overly complex synthesis procedures
3Manufacturing precision
If post-synthesis treatments are applied to achieve target zeolite, then desired composition and structure are obtained, but additional processing time and steps are required
Solution Approach 1:
The patent achieves precise boron content control (0.015-0.050 mol Q per mol YO2) through carefully controlled hydrothermal crystallization conditions, reducing the need for extensive post-synthesis treatment while maintaining manufacturing precision
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
SSZ-82 exhibits unique properties and improved selectivities in hydrocarbon conversion and gas separation processes, demonstrated by its characterization through X-ray diffraction patterns and suitability in catalysts for hydrocarbon reactions and gas separations.
Implementation Method 1
a method for preparing SSZ-82 using a 1,6-bis(N-cyclohexylpyrrolidinium)hexane dication as a structure directing agent
Implementation Method 2
post-synthesis treatments like heteroatom lattice substitution to achieve the target zeolite composition and structure
Implementation Method 3
characterization through X-ray diffraction patterns
Data Source
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AI summary
The present invention is directed to a new crystalline molecular sieve designated SSZ-82, a method for preparing SSZ-82 using a 1,6-bis(N-cyclohexylpyrrolidinium)hexane dication as a structure directing agent, and uses for SSZ-82.