SSZ-109 Molecular Sieve Synthesis Using Tetramethylhexanediaminium Template
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Solution Overview
Problem
The synthesis of molecular sieve SSZ-109 requires effective structure directing agents to achieve the correct crystalline structure, and existing methods may not consistently produce the desired composition and properties.
Innovation Solution
A method involving a reaction mixture with silicon oxide, a trivalent element oxide, optionally a Group 1 or Group 2 metal, N,N',N'-diisopropyl-N,N',N'-tetramethylhexane-1,6-diaminium cations as a structure directing agent, hydroxide ions, and water, subjected to crystallization conditions to form SSZ-109 crystals, with subsequent thermal treatment to remove the directing agent.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If existing structure directing agents are used for SSZ-109 synthesis, then crystalline structure can be achieved, but consistent composition and properties cannot be reliably obtained
Solution Approach 1:
The patent changes the chemical parameters of the structure directing agent by using specific quaternary ammonium cations with defined alkyl groups (isobutyl, neopentyl, or combinations thereof). This parameter change in the organic template structure enables reliable and consistent synthesis of SSZ-109 with reproducible composition and properties, resolving the contradiction between reliability and manufacturing precision.
2Quantity of substance
If thermal treatment is applied to remove directing agent, then porosity is improved, but structural integrity may be compromised
Solution Approach 1:
The patent applies local quality by performing thermal treatment under controlled conditions (temperature range and atmosphere) that selectively remove the organic directing agent from the porous structure while preserving the overall crystalline framework. This localized removal approach achieves the desired porosity enhancement without compromising the structural integrity of the molecular sieve.
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 synthesizes SSZ-109 with the desired composition and properties, including specific molar ratios and X-ray diffraction patterns, and demonstrates catalytic performance in hydrocarbon conversion reactions.
Implementation Method 1
subjected to crystallization conditions to form SSZ-109 crystals
Implementation Method 2
subsequent thermal treatment to remove the directing agent
Implementation Method 3
Certain zeolitic materials are ordered, porous crystalline metallosilicates having a definite crystalline structure as determined by X-ray diffraction
Data Source
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AI summary
A method is provided for synthesizing a molecular sieve having the framework structure of SSZ-109 using N1,N6-diisopropyl-N1,N1,N6,N6-tetramethylhexane-1,6- diaminium cations as a structure directing agent.