Organotemplate-Free Zeolite Beta Synthesis via Seed Crystals
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Solution Overview
Problem
The existing methods for producing zeolitic materials with a BEA framework structure, such as zeolite Beta, rely on organic templates, which lead to lengthy crystallization periods, high production costs, energy consumption, and environmental pollution due to the need for high-temperature calcination for template removal, limiting their applications.
Innovation Solution
A process for producing organotemplate-free zeolitic materials with a BEA framework structure using seed crystals, which eliminates the need for organic templates, reducing crystallization time and energy consumption, and avoiding harsh thermal treatments, allowing for direct synthesis under mild conditions.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If organic templates are used in the synthesis of zeolitic materials with BEA framework structure, then the crystallization process can proceed, but the crystallization period becomes excessively long (66-72 hours)
Solution Approach 1:
The patent removes organic template compounds from the synthesis system entirely, extracting the problematic element that causes long crystallization periods. By using a template-free synthesis approach with controlled pH and specific SiO2/Al2O3 ratios, the patent achieves crystallization in significantly reduced time without requiring tetraalkylammonium salts or other organic structure-directing agents.
Solution Approach 2:
The patent changes key synthesis parameters including maintaining pH between 9-11, using SiO2/Al2O3 molar ratios of 10-50, and controlling temperature between 80-150°C. These parameter modifications enable faster crystallization kinetics and reduce the required crystallization time from 66-72 hours to 2-48 hours while maintaining zeolite Beta framework formation.
2Reliability
If organic template compounds are used in synthesis, then zeolitic framework can be formed, but production costs increase due to expensive fine chemicals
Solution Approach 1:
The patent extracts and eliminates expensive organic template compounds (such as tetraethylammonium and dibenzylmethylammonium salts) from the synthesis process. By replacing these costly fine chemicals with simple inorganic bases like NaOH or KOH, the patent dramatically reduces material costs while maintaining reliable zeolite Beta framework formation through controlled pH and composition parameters.
Solution Approach 2:
The patent replaces expensive, complex organic templates with inexpensive, readily available inorganic bases. These cheap alternatives (NaOH, KOH) can be easily handled and disposed of without requiring costly removal steps, making the overall manufacturing process more economically viable while achieving the same structural outcome.
3Reliability
If organic templates are used in synthesis, then zeolitic structure can be created, but energy consumption increases due to high-temperature calcination required for template removal
Solution Approach 1:
The patent removes organic template compounds from the synthesis system, thereby eliminating the need for high-temperature calcination steps (200-930°C) that are normally required to remove templates. By using template-free synthesis with inorganic bases, the patent avoids energy-intensive thermal treatment while still creating the desired zeolitic framework structure through controlled hydrothermal crystallization.
Solution Approach 2:
The patent skips the entire calcination step by never introducing organic templates in the first place. This allows the synthesis process to proceed directly from mixing reagents to crystallization and filtration, bypassing the energy-intensive template removal stage entirely and reducing overall energy consumption while maintaining structural integrity.
4Reliability
If high-temperature calcination is performed for template removal, then organic templates can be eliminated, but harmful gases and waste products are produced
Solution Approach 1:
The patent extracts and eliminates organic template compounds from the synthesis process, thereby preventing the formation of harmful gases and waste products that would result from their decomposition during calcination. By using only inorganic reagents (NaOH, KOH, silicates, aluminates), the patent ensures that no organic decomposition products are generated, making the process environmentally friendly from the outset.
Solution Approach 2:
The patent converts the potential harm of template decomposition into a benefit by simply not using templates in the first place. The synthesis process is designed from the beginning to be template-free, transforming what would have been a harmful post-synthesis removal step into a beneficial pre-synthesis design choice that prevents pollution at the source.
5Reliability
If harsh thermal treatment is applied for template removal, then organic templates can be destroyed, but the zeolite architecture may be damaged
Solution Approach 1:
The patent removes organic templates from the synthesis system, eliminating the need for harsh thermal treatment that could damage the zeolite framework. By using template-free synthesis, the patent preserves the zeolite architecture throughout the process, avoiding framework collapse, phase transformations, or loss of crystallinity that would result from high-temperature calcination.
Solution Approach 2:
The patent cushions against potential framework damage by designing a synthesis process that never introduces vulnerable organic templates. The gentle hydrothermal conditions (pH 9-11, 80-150°C) used in template-free synthesis inherently protect the forming zeolite framework from the mechanical and thermal stresses of subsequent template removal, ensuring structural integrity from the start.
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 process significantly reduces production time and costs, preserves the zeolite architecture, and enables the production of novel zeolitic materials with enhanced properties suitable for catalytic applications, while minimizing environmental impact.
Implementation Method 1
seed crystals are often used as nucleating agents for improving the rate of crystallization
Implementation Method 2
crystallizing the mixture
Data Source
AI summary
The present invention relates to an organotemplate-free synthetic process for the production of a zeolitic material having a BEA framework structure comprising YO2 and optionally comprising X2O3, wherein said process comprises the steps of (1) preparing a mixture comprising seed crystals and at least one source for YO2; and (2) crystallizing the mixture; wherein Y is a tetravalent element, and X is a trivalent element, wherein the zeolitic material optionally comprises at least one alkali metal M, wherein when the BEA framework additionally comprises X2O3, the mixture according to step (1) comprises at least one source for X2O3, and wherein the seed crystals comprise zeolitic material having a BEA framework structure, preferably zeolite Beta.