BEA Zeolite Composition for High Acidity Without Crystallinity Loss
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Solution Overview
Problem
Existing methods for dealuminating zeolites, such as acid treatment and steam treatment, often result in reduced acid strength and crystallinity due to aluminum elution and structural defects.
Innovation Solution
A BEA type zeolite with specific characteristics in NH3-TPD and X-ray diffraction spectra, along with controlled SiO2/Al2O3 molar ratio, ensuring high acid strength and crystallinity through controlled dealumination.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Quantity of substance
If dealumination is carried out by acid treatment and/or steam treatment to increase SiO2/Al2O3 molar ratio, then the SiO2/Al2O3 molar ratio increases, but acid strength decreases and crystallinity decreases
Solution Approach 1:
The invention changes the chemical composition parameters by controlling the SiO2/Al2O3 molar ratio within a specific range (50-200) and adjusting the Al content in the framework (0.05-0.5 mmol/g). This parameter optimization allows achieving both high SiO2/Al2O3 ratio and maintained acid strength/crystallinity, resolving the contradiction between increasing molar ratio and maintaining reliability.
Solution Approach 2:
The invention introduces a specific compositional range as an intermediary condition between dealumination treatment and the desired properties. By controlling Al content and SiO2/Al2O3 ratio within defined parameters, the patent acts as a mediator that prevents excessive dealumination effects (which cause crystallinity loss) while still achieving the desired high molar ratio and acid strength.
2Quantity of substance
If aluminum is dealuminated from the framework structure to increase SiO2/Al2O3 molar ratio, then the SiO2/Al2O3 molar ratio increases, but defects are generated in the crystal structure and crystallinity decreases
Solution Approach 1:
The invention optimizes the Al content parameter in the framework to a specific range (0.05-0.5 mmol/g) which prevents excessive dealumination. This controlled parameter change allows increasing SiO2/Al2O3 ratio while maintaining crystallinity by avoiding the generation of structural defects that occur with aggressive dealumination.
Solution Approach 2:
The invention applies partial dealumination rather than complete removal of aluminum. By controlling the Al content to remain within 0.05-0.5 mmol/g, the patent achieves sufficient SiO2/Al2O3 ratio increase for desired applications while avoiding excessive action that would generate crystallinity defects.
3Quantity of substance
If acid treatment is used to dealuminize zeolite to increase SiO2/Al2O3 molar ratio, then the SiO2/Al2O3 molar ratio increases, but acid strength lowers
Solution Approach 1:
The invention changes the compositional parameters by controlling SiO2/Al2O3 ratio (50-200) and Al content (0.05-0.5 mmol/g) to achieve a balance. This optimized parameter range maintains acid strength while achieving the desired increase in SiO2/Al2O3 molar ratio, preventing the acid strength loss that occurs with conventional aggressive acid treatment.
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 proposed BEA type zeolite maintains high acid strength and crystallinity across a broad range of SiO2/Al2O3 ratios, suitable for various applications.
Implementation Method 1
ammonia-temperature programmed desorption method (NH3-TPD method)... peak caused by adsorption towards acid points
Implementation Method 2
ammonia-temperature programmed desorption method... being raised at 10°C/min... in an X-ray diffraction spectrum measured by an X-ray diffraction method
Implementation Method 3
in an X-ray diffraction spectrum measured by an X-ray diffraction method using a CuKα line, a ratio A/B of maximum diffraction intensity A of peaks of the BEA type zeolite
Data Source
Figure 1~2
Figure 3~4
Figure 5~6
AI summary
Provided is a BEA type zeolite having high acid strength and high crystallinity in a broad range of SiO2/Al2O3 molar ratio. One of the present invention is a BEA type zeolite wherein the BEA type zeolite has a top of a peak caused by adsorption towards acid points of the BEA type zeolite in a range of 340°C or higher and 500°C or lower in an NH3-TPD spectrum being raised at 10°C/min according to an ammonia-temperature programmed desorption method (NH3-TPD method), and wherein in an X-ray diffraction spectrum measured by an X-ray diffraction method using a CuKα line, a ratio A/B of maximum diffraction intensity A of peaks of the BEA type zeolite to diffraction intensity B of a (111) plane of Si as a standard reference material 640c distributed by The National Institute of Standards and Technology is 25 or higher.