SSZ-102 Molecular Sieve Synthesis via Dication Templating
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Solution Overview
Problem
There is a need for crystalline molecular sieves with ESV framework topology and a SiO2/Al2O3 mole ratio between 5 to 12, which have not been effectively synthesized using existing methods.
Innovation Solution
The synthesis of crystalline molecular sieve SSZ-102 is achieved by contacting sources of silicon, aluminum, and an N,N'-dimethyl-1,4-diazabicyclo[2.2.2]octane dication under crystallization conditions, with specific mole ratios of SiO2/Al2O3, M/SiO2, Q/SiO2, OH/SiO2, and H2O/SiO2, to form crystals with ESV framework topology.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If existing synthesis methods are used for ESV framework molecular sieves, then molecular sieves with SiO2/Al2O3 ratio between 15-30 can be obtained, but molecular sieves with SiO2/Al2O3 ratio between 5-12 cannot be effectively synthesized
Solution Approach 1:
The patent changes the chemical composition parameters of the synthesis gel, specifically using a SiO2/Al2O3 ratio of 5-12 which is lower than conventional methods. This parameter change enables the formation of molecular sieves with the desired low SiO2/Al2O3 ratio that cannot be achieved by existing synthesis methods
Solution Approach 2:
The patent introduces an N,N'-dimethyl-1,4-diazabicyclo[2.2.2]octane dication as a structure directing agent (intermediary) that mediates the crystallization process. This intermediary enables the formation of ESV framework topology with the specific low SiO2/Al2O3 ratio by directing the assembly of silica and alumina units during synthesis
2Manufacturing precision
If conventional structure directing agents are used, then synthesis processes are simpler, but molecular sieves with unique ESV framework topology and specific composition cannot be obtained
Solution Approach 1:
The N,N'-dimethyl-1,4-diazabicyclo[2.2.2]octane dication acts as a specialized intermediary that templates the formation of the ESV framework topology. Its specific molecular structure and dicationic nature enable it to direct the assembly of aluminosilicate units into the desired framework, achieving precise topology control
Solution Approach 2:
The patent specifies precise compositional parameters including SiO2/Al2O3 ratio of 5-12, M/SiO2 ratio of 0.40-0.90, Q/SiO2 ratio of 0.15-0.35, OH/SiO2 ratio of 0.70-1.20, and H2O/SiO2 ratio of 15-35. These parameter changes are necessary to achieve the unique ESV framework with the desired properties
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 production of SSZ-102 with unique properties, as characterized by X-ray diffraction patterns, suitable for applications in gas separations, catalysis, and pollution control, such as reducing oxides of nitrogen in automobile exhaust.
Implementation Method 1
contacting under crystallization conditions: (1) at least one source of silicon; (2) at least one source of aluminum; (3) at least one source of an element selected from Groups 1 and 2 of the Periodic Table; (4) hydroxide ions; and (5) an N,N'-dimethyl-1,4-diazabicyclo[2.2.2]octane dication as a structure directing agent
Data Source
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AI summary
A new crystalline molecular sieve designated SSZ-102 having ESV framework topology is disclosed. SSZ-102 is synthesized using an N,N'-dimethyl-1,4-diazabicyclo[2.2.2]octane dication as a structure directing agent.