Catalyst Monoliths via Extruded Fiber Stacking
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Solution Overview
Problem
Current catalysts for hydrocarbon reforming, particularly in the presence of CO2, face limitations such as high reactor pressure drop, low specific surface area, and low mechanical stability due to their production methods, which restrict optimal performance.
Innovation Solution
A method for producing a three-dimensional porous catalyst monolith of stacked catalyst fibers using a suspension paste containing nickel-magnesium mixed oxide and magnesium spinel, with specific crystallite sizes and proportions, extruded through nozzles to form fibers, then dried and calcined, allowing for a regularly structured monolith with high surface area and mechanical strength.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If conventional extrusion or tableting methods are used to produce catalyst shaped bodies, then the production process is simple and well-established, but the catalyst exhibits high reactor pressure drop, low specific surface area, and low mechanical stability
Solution Approach 1:
The catalyst body is segmented into stacked disc-shaped layers with through-channels, creating a modular structure that reduces pressure drop while maintaining mechanical stability. Each disc layer can be independently produced and then stacked to form the complete catalyst body.
Solution Approach 2:
The catalyst discs incorporate through-channels creating a porous structure that significantly reduces reactor pressure drop. The porous design allows fluid to flow through the catalyst body more easily while maintaining high catalytic activity on the internal surfaces.
2Manufacturing precision
If catalyst shaped bodies are designed for optimal geometry, then reactive surface area and thermal conductivity are improved, but mechanical stability and production feasibility are compromised
Solution Approach 1:
The optimized geometry is achieved by segmenting the catalyst into stacked discs rather than producing a single monolithic shape. This segmentation allows each disc to be structurally sound while the overall assembly achieves optimal flow and thermal characteristics.
Solution Approach 2:
The catalyst uses a composite structure combining disc-shaped elements with through-channels, integrating multiple functional features (mechanical strength, flow channels, catalytic surfaces) into a unified design that achieves optimal performance across all parameters.
3Area of stationary object
If the catalyst structure is optimized for high specific surface area, then catalytic activity is improved, but reactor pressure drop increases and mechanical stability decreases
Solution Approach 1:
The through-channels create a porous structure that provides high specific surface area for catalytic reactions while simultaneously reducing pressure drop by allowing efficient fluid flow through the catalyst body. The porous design eliminates the trade-off between surface area and flow resistance.
4Ease of manufacture
If conventional extrusion methods are used, then production is straightforward, but the catalyst exhibits low crushing strength and poor mechanical stability
Solution Approach 1:
The catalyst is produced as segmented disc layers rather than a single extruded piece. Each disc can be produced using simplified extrusion or molding, then stacked and bonded to form the complete structure. This segmentation allows each component to achieve optimal mechanical strength for its function.
Solution Approach 2:
The stacked disc structure creates a composite catalyst body where multiple individually-strengthened components work together. The bonding between discs and the internal through-channel structure collectively enhance the overall mechanical stability and crushing strength of the catalyst assembly.
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 resulting catalysts exhibit improved mechanical stability, increased specific surface area, and reduced reactor pressure drop, enhancing catalytic performance and process efficiency in hydrocarbon reforming reactions.
Implementation Method 1
b) extruding the paste of step a) through one or more nozzles to form fibers, and depositing the extruded fibers to form a three-dimensional porous catalyst monolith precursor
Implementation Method 2
c) drying the porous catalyst monolith precursor to remove the liquid diluent
Implementation Method 3
d) calcining the porous catalyst monolith precursor to form the porous catalyst monolith
Data Source
Figure 1~2
AI summary
A method for producing a three-dimensional porous catalyst monolith of stacked catalyst fibers, comprising the following steps: a) Preparing a suspension paste in a liquid diluent of a reforming catalyst, and which suspension can furthermore comprise a binder material, all particles in the suspension having an average particle size in the range of from 0.5 to 500 μm, b) extruding the paste of step a) through one or more nozzles to form fibers, and depositing the extruded fibers to form a three-dimensional porous catalyst monolith precursor, c) drying the porous catalyst monolith precursor to remove the liquid diluent, d) calcining the porous catalyst monolith precursor to form the porous catalyst monolith.