SSZ-98 Molecular Sieve Synthesis Using Alternative Cations
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Solution Overview
Problem
Current methods for synthesizing molecular sieve SSZ-98 rely on N,N'-dimethyl-1,4-diazabicyclo[2.2.2]octane dications as structure directing agents, which may not be as effective or versatile as other cations in controlling the crystallization process.
Innovation Solution
The use of 1,1-diethylpyrrolidinium cations, 1-butyl-1-methylpiperidinium cations, 1,1-diethyl-4-methylpiperidinium cations, and 8-(pyridin-2-yl)-5,8-diazaspiro[4.5]decan-5-ium cations as structure directing agents in a reaction mixture comprising silicon oxide, aluminum oxide, a Group 1 or 2 metal, hydroxide ions, and water, under controlled crystallization conditions to form SSZ-98 crystals.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If N,N'-dimethyl-1,4-diazabicyclo[2.2.2]octane dications are used as structure directing agents, then molecular sieve SSZ-98 can be synthesized, but the synthesis effectiveness and versatility are limited
Solution Approach 1:
The patent changes the chemical parameters of the structure directing agent by replacing N,N'-dimethyl-1,4-diazabicyclo[2.2.2]octane dications with alternative cations including 1,1-diethylpyrrolidinium, 1-butyl-1-methylpiperidinium, 1,1-diethyl-4-methylpiperidinium, and 8-(pyridin-2-yl)-5,8-diazaspiro[4.5]decan-5-ium cations. This parameter change expands the versatility of available structure directing agents while maintaining their ability to effectively control the crystallization process and direct the formation of SSZ-98 molecular sieve with ERI framework topology.
2Adaptability or versatility
If alternative cations are used as structure directing agents, then the versatility of synthesis methods is improved, but the complexity of selecting the appropriate cation increases
Solution Approach 1:
The patent demonstrates that multiple different cation types can serve the same universal function of directing SSZ-98 crystallization. The alternative cations (1,1-diethylpyrrolidinium, 1-butyl-1-methylpiperidinium, 1,1-diethyl-4-methylpiperidinium, and 8-(pyridin-2-yl)-5,8-diazaspiro[4.5]decan-5-ium) all perform the same structure-directing role despite their structural differences, providing universality in function while expanding the range of available agents.
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
These alternative cations effectively direct the synthesis of SSZ-98, allowing for the production of molecular sieves with specific molar ratios and pore structures, enhancing the catalytic and adsorptive properties of the material.
Implementation Method 1
subjecting the reaction mixture to crystallization conditions sufficient to form crystals of the molecular sieve
Data Source
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AI summary
A method is disclosed for synthesizing molecular sieve SSZ-98 using a structure directing agent selected from one or more of 1,1-diethylpyrrolidinium cations, 1-butyl-1-methylpiperidinium cations, 1,1-diethyl-4-methylpiperidinium cations, and 8-(pyridin-2-yl)-5,8-diazaspiro[4.5]decan-5-ium cations.