Ferrierite-Coated Zeolite Core for Stable Methyl Acetate Synthesis
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Solution Overview
Problem
Conventional zeolite catalysts used in dimethyl ether carbonylation reactions suffer from rapid inactivation due to coke generation and by-product formation, limiting their selectivity and stability, especially at low carbon monoxide to dimethyl ether molar ratios.
Innovation Solution
A zeolite-based compound with high crystallinity is developed, featuring a core/shell structure where the zeolite core is supplemented with a ferrierite surface-portion, enhancing its crystallinity and stability, and used as a catalyst for improved methyl acetate production.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If conventional zeolite catalysts are used for dimethyl ether carbonylation, then the reaction can proceed, but the catalyst is rapidly inactivated due to coke generation and by-product formation
Solution Approach 1:
The patent uses a composite material consisting of a zeolite core (mordenite, ZSM-5, or zeolite-Y) coated with a ferrierite shell. This core-shell structure combines the advantages of different zeolite types: the inner core provides high selectivity for methyl acetate production, while the outer ferrierite shell prevents coke formation and by-product generation, thereby maintaining catalyst stability and extending catalyst lifetime without sacrificing activity.
2Manufacturing precision
If mordenite zeolite is used as catalyst, then high selectivity is achieved at low temperature, but the catalyst is rapidly inactivated
Solution Approach 1:
The patent applies local quality by creating a heterogeneous structure where different regions of the catalyst have different functions. The inner core region (mordenite, ZSM-5, or zeolite-Y) is optimized for high selectivity in methyl acetate production, while the outer shell region (ferrierite) is optimized for preventing deactivation by blocking coke formation sites. This spatial division of functional qualities allows simultaneous achievement of high selectivity and catalyst stability.
3Productivity
If conventional zeolite catalysts are used, then carbonylation reaction occurs, but hydrocarbon by-products are generated and selectivity is limited
Solution Approach 1:
The composite core-shell structure enables simultaneous optimization of productivity and selectivity. The inner zeolite core maintains high reaction activity for carbonylation, while the outer ferrierite shell acts as a selective barrier that prevents side reactions leading to hydrocarbon by-products. This results in enhanced productivity with improved selectivity for the desired methyl acetate product.
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 zeolite-based compound with high crystallinity maintains stable activation and increases the selectivity of methyl acetate and methanol, even at lower carbon monoxide to dimethyl ether ratios, leading to enhanced ethanol yield and reduced hydrocarbon by-products, while allowing for easy synthesis and recycling of methanol.
Implementation Method 1
synthesizing ferrierite on a surface of the seed using the seed as a structure-directing agent
Implementation Method 2
used as a catalyst for producing methyl acetate
Data Source
AI summary
The present disclosure provides a zeolite-based compound having a high crystallinity, a method for producing the zeolite-based compound, and a method for producing methyl acetate using the zeolite-based compound. The zeolite-based compound includes a zeolite-based core; and a surface-portion formed on at least a portion of a surface of the zeolite-based core and made of ferrierite.