CHA Zeolite Synthesis via Cycloalkyl-Ethyl Template Combination
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Solution Overview
Problem
There is a need for a cost-effective process to produce zeolitic materials with a CHA-type framework structure, as existing methods are expensive and inefficient, particularly in terms of reaction times and catalytic performance.
Innovation Solution
A process involving a combination of cycloalkylammonium compounds and ethyltrimethylammonium cations is used to synthesize zeolitic materials, reducing reaction times and enhancing catalytic properties, particularly in selective catalytic reduction (SCR) applications.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If expensive organotemplates like 1-adamantyltrimethylammonium are used, then the CHA-type zeolitic material can be synthesized, but the production cost increases significantly
Solution Approach 1:
The patent replaces expensive, complex organotemplates (1-adamantyltrimethylammonium) with cheaper, simpler alternatives (cycloalkylammonium compounds combined with ethyltrimethylammonium). This substitution maintains the ability to synthesize CHA-type zeolitic materials while significantly reducing production costs, embodying the principle of using inexpensive substitutes to achieve the same functional outcome
Solution Approach 2:
The patent employs a composite templating system combining cycloalkylammonium compounds (cyclopentylammonium or cyclohexylammonium) with ethyltrimethylammonium compounds. This composite approach allows the simpler, cheaper cycloalkylammonium to work effectively when combined with ethyltrimethylammonium, achieving reliable CHA-type synthesis without requiring expensive single-component templates
2Reliability
If conventional synthesis methods are used, then CHA-type zeolitic material is produced, but the reaction time is excessively long
Solution Approach 1:
The patent changes the chemical parameters of the templating system by using cycloalkylammonium compounds (cyclopentylammonium or cyclohexylammonium) combined with ethyltrimethylammonium compounds. This parameter change in the template structure and composition accelerates the crystallization kinetics, reducing reaction time from conventional extended periods to 24-72 hours while maintaining reliable CHA-type product formation
Solution Approach 2:
The ethyltrimethylammonium compound acts as an intermediary that enhances the effectiveness of the cycloalkylammonium template. This combination creates a synergistic effect where the simpler cycloalkylammonium template, when paired with ethyltrimethylammonium, achieves effective template direction with faster reaction rates, mediating between template simplicity and synthesis efficiency
3Reliability
If existing synthesis approaches are employed, then zeolitic material is obtained, but the catalytic performance in SCR applications is insufficient
Solution Approach 1:
The patent uses simpler, cheaper cycloalkylammonium compounds (cyclopentylammonium or cyclohexylammonium) combined with ethyltrimethylammonium to synthesize CHA-type zeolitic materials with superior catalytic performance. This substitution achieves both cost reduction and enhanced SCR catalytic activity, demonstrating that simpler templates can produce higher-performance catalysts
Solution Approach 2:
The patent optimizes the compositional parameters of the templating system by combining cycloalkylammonium compounds with ethyltrimethylammonium compounds. This parameter optimization produces CHA-type zeolitic materials with improved catalytic properties for SCR applications, achieving better catalytic performance through controlled variation of template composition rather than complex synthesis procedures
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 process significantly reduces production costs and improves the physical and chemical properties of the zeolitic materials, leading to enhanced catalytic performance in SCR applications.
Implementation Method 1
a process for the preparation of a zeolitic material having a CHA-type framework structure... comprising one or more ethyltrimethylammonium cation-containing compounds, and one or more cycloalkylammonium compounds as structure directing agent
Data Source
Figure 1A
Figure 1B
Figure 1C
AI summary
The present invention relates to a process for the preparation of a zeolitic material having a CHA-type framework structure comprising YO2 and X2O3, wherein said process comprises the steps of: (1) providing a mixture comprising one or more sources for YO2, one or more sources for X2O3, one or more optionally substituted ethyltrimethylammonium cation-containing compounds, and one or more tetraalkylammonium cation R1R2R3R4N+-containing compounds as structure directing agent; (2) crystallizing the mixture obtained in step (1) for obtaining a zeolitic material having a CHA-type framework structure; wherein Y is a tetravalent element and X is a trivalent element, wherein R1, R2, and R3 independently from one another stand for alkyl, wherein R4 stands for cycloalkyl, and wherein the YO2 : X2O3 molar ratio of the mixture in (1) ranges from 2 to 1,000, as well as to zeolitic materials which may be obtained according to the inventive process and to their use.