Boron ITQ-21 Molecular Sieve Synthesis and Catalytic Use
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Solution Overview
Problem
Existing molecular sieves do not include a boron-containing ITQ-21 crystal structure, limiting the development of unique catalysts and adsorption/separation materials.
Innovation Solution
A new crystalline germanosilicate molecular sieve, boron ITQ-21, is synthesized using an N,N-diethyl-5,8-dimethyl-2-azonium bicyclo [3.2.2] nonane cation as a structure directing agent, allowing for the formation of boron-containing ITQ-21 with a specific crystal structure.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If a conventional molecular sieve structure is used, then the synthesis process is straightforward, but the catalytic properties and adsorption capabilities are limited
Solution Approach 1:
The patent creates a composite molecular sieve structure by incorporating boron into the ITQ-21 framework, combining silicon and germanium atoms with boron atoms to form a novel crystalline structure. This composite approach at the atomic level enables unique catalytic and adsorption properties that neither conventional molecular sieves nor simple mixtures could achieve, directly resolving the contradiction between versatility and structural complexity.
Solution Approach 2:
The invention changes the chemical composition parameters of the molecular sieve by introducing boron atoms at specific framework positions, altering the electronic and steric properties of the crystal structure. This parameter change in composition (adding boron) transforms the conventional molecular sieve into a new material with enhanced adaptability for catalysis and adsorption, while maintaining a defined crystal structure.
2Adaptability or versatility
If boron is incorporated into the ITQ-21 structure, then unique catalytic and adsorption properties are achieved, but the synthesis becomes more difficult
Solution Approach 1:
The patent uses a specific organic structure-directing agent (SDA) as an intermediary during synthesis. This SDA mediates the incorporation of boron into the ITQ-21 framework by organizing the reaction components and guiding the formation of the desired crystal structure. The intermediary agent makes the complex boron-containing structure synthesis feasible by providing a template that directs atomic assembly, thus resolving the contradiction between achieving unique properties and maintaining ease of manufacture.
3Adaptability or versatility
If the crystal structure is changed to create new molecular sieves, then new catalysts and adsorption materials are developed, but the synthesis process becomes fraught with difficulties
Solution Approach 1:
The patent applies preliminary action by pre-organizing the reaction components and using a structure-directing agent before the actual crystal formation. The SDA is introduced in advance to establish the desired structural framework, and reaction conditions are pre-optimized to facilitate boron incorporation. This preliminary preparation simplifies the overall synthesis process despite the complexity of creating a new crystal structure, resolving the contradiction between developing new capabilities and maintaining ease of manufacture.
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
The boron ITQ-21 molecular sieve offers unique catalytic properties for organic compound conversion reactions and serves as an effective adsorption/separation material, expanding the capabilities of molecular sieves in industrial applications.
Implementation Method 1
subjecting the reaction mixture to crystallization conditions sufficient to form crystals of the boron molecular sieve
Implementation Method 2
The boron containing ITQ-21 molecular sieve is then treated to remove the SDA, which can be achieved by calcination or by ozone treatment
Implementation Method 3
The boron containing ITQ-21 molecular sieve is then treated to remove the SDA, which can be achieved by calcination or by ozone treatment
Data Source
AI summary
A novel synthetic crystalline molecular sieve material, designated boron ITQ-21, is provided. The boron ITQ-21 can be synthesized using an N,N-diethyl-5,8-dimethyl-2-azonium bicyclo [3.2.2] nonane cation as a structure directing agent. The boron ITQ-21 may be used in organic compound conversion reactions and/or sorptive processes.