Monolithic Catalyst with SBA-16 Membrane for Fischer-Tropsch Synthesis
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Solution Overview
Problem
Conventional Fischer-Tropsch synthesis catalysts in powder form face challenges such as large pressure drop in fixed-bed reactors and damage to their porous structure when reshaped into spherical or cylindrical forms, leading to reduced catalytic performance.
Innovation Solution
A monolithic catalyst with a mesoporous silica SBA-16 molecular sieve membrane grown in-situ on a metal matrix, acting as a carrier for cobalt and an additive, which reduces pressure drop and maintains catalytic performance while being suitable for industrial reactors.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If powder catalysts are used for Fischer-Tropsch synthesis, then catalytic activity is achieved, but pressure drop across the catalyst bed becomes large
Solution Approach 1:
The catalyst is segmented into individual cells with a monolithic structure, where each cell contains the active catalyst material. This segmentation allows gas to flow through multiple parallel pathways simultaneously, reducing the pressure drop across the catalyst bed while maintaining high catalytic activity through the distributed active sites within each cell.
Solution Approach 2:
The invention employs a thin-walled monolithic structure with optimized cell thickness to create a flexible yet structurally sound catalyst bed. The thin walls reduce flow resistance and pressure drop while the monolithic integrity maintains structural stability during operation.
2Shape
If molecular sieve powders are reshaped into spherical or cylindrical forms, then industrial shape requirements are met, but the porous structure is damaged and catalytic performance is reduced
Solution Approach 1:
The catalyst is pre-formed into the desired industrial shapes (spherical, cylindrical, cloverleaf, or gear wheel) during the monolithic structure fabrication process itself, rather than reshaping powder catalysts later. This preliminary action ensures the porous structure is already optimized for catalysis before the final shape is achieved, eliminating the damage that would result from post-forming reshaping operations.
Solution Approach 2:
The invention creates a composite monolithic structure combining the metal matrix support with the molecular sieve coating in a single integrated form. This composite approach allows the catalyst to be manufactured in industrial shapes while maintaining the porous molecular sieve structure intact, as both materials are formed together rather than assembled from separate powder components.
3Productivity
If molecular sieve powders are used as carrier, then catalytic function is provided, but the porous structure is damaged during reshaping operations
Solution Approach 1:
The invention merges the carrier structure and the catalytic function into a single integrated monolithic component. The molecular sieve coating is applied directly to the metal matrix support in a continuous process, creating a unified structure where the carrier and catalyst work together without requiring separate handling or reshaping operations that would damage the porous structure.
Solution Approach 2:
The molecular sieve forms a thin film coating on the metal matrix support, creating a flexible yet structurally sound layer that maintains its porous integrity. This thin film approach preserves the porous structure's catalytic properties while providing the necessary mechanical strength for industrial application.
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 monolithic catalyst improves mass transfer, increases catalyst activity, and facilitates uniform gas distribution, reducing equipment and operation costs, with enhanced CO conversion and selectivity compared to traditional powder catalysts.
Implementation Method 1
placing the metal matrixes in a molecular sieve solution of mesoporous silica SBA-16 and crystallizing the mesoporous silica SBA-16 for 5 to 120 hrs at a temperature of between 70 and 150° C. in a reaction still; allowing the mesoporous silica SBA-16 to grow in-situ on a surface of the metal matrixes
Implementation Method 2
The molecular sieve membrane is mesoporous silica SBA-16 which is disposed on a surface of the metal matrix and is a carrier of the cobalt and the additive
Implementation Method 3
Monolithic catalyst for Fischer-Tropsch synthesis and a method for preparing the monolithic catalyst
Data Source
AI summary
A monolithic catalyst, including cobalt, a metal matrix, a molecular sieve membrane, and an additive. The metal matrix is silver, gold, copper, platinum, titanium, molybdenum, iron, tin, or an alloy thereof. The molecular sieve membrane is mesoporous silica SBA-16 which is disposed on the surface of the metal matrix and is a carrier of the active component and the additive. The thickness of the carrier is between 26 and 67 μm. The additive is lanthanum, zirconium, cerium, rhodium, platinum, rhenium, ruthenium, titanium, magnesium, calcium, strontium, or a mixture thereof. A method for preparing the monolithic catalyst is also provided.