Monolithic SiC Catalyst Structure for Synthetic Gas Reforming
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Solution Overview
Problem
Conventional pellet-type catalysts used in the reforming process for producing synthetic gas are prone to damage due to mechanical impact, thermal expansion, and coke formation, leading to flow resistance and performance deterioration.
Innovation Solution
A catalyst structure with a substrate having flow paths partitioned by partition walls, where the catalytic material is coated on the partition walls, utilizing a metal oxide carrier and metal active particles, and the substrate is made of materials with high thermal conductivity such as silicon carbide or silicon nitride.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a pellet-type catalyst is used in the reforming process, then the catalytic activity is maintained, but the catalyst is damaged into pieces due to mechanical impact, thermal expansion, and coke formation, causing flow resistance and performance deterioration
Solution Approach 1:
The catalyst is segmented into two functional parts: a monolithic substrate providing structural integrity and flow channels, and catalytic material coated on the inner walls for chemical activity. This segmentation prevents the entire catalyst structure from breaking into pieces while maintaining catalytic function.
Solution Approach 2:
The monolithic substrate acts as an intermediary between the reaction gas and the catalytic material. It provides a mechanically strong framework that prevents direct contact and mechanical damage between catalyst particles, while still allowing gas flow and heat transfer through its porous structure.
2Reliability
If a pellet-type catalyst is used, then the catalytic function is provided, but a temperature gradient is formed within the reactor due to low thermal conductivity, promoting catalyst performance deterioration and coke formation
Solution Approach 1:
The monolithic substrate has a porous structure with controlled porosity (30-70%) that allows efficient heat and mass transfer through the catalyst layer. The pores enable reaction gas to penetrate deep into the catalyst structure while facilitating heat distribution, reducing temperature gradients.
Solution Approach 2:
The catalyst system combines a monolithic substrate material (providing mechanical strength and thermal stability) with catalytic material (providing chemical activity). This composite structure integrates the advantages of both materials: structural integrity and high thermal conductivity from the monolith, and catalytic function from the coated material.
3Temperature
If the catalytic material is coated on the partition walls of the substrate, then the heat transfer performance is improved and temperature gradient is reduced, but the pressure loss and flow resistance of the reaction gas may increase
Solution Approach 1:
The catalytic material is applied locally on the inner walls of the flow channels rather than as bulk pellets. This localized coating provides catalytic activity only where needed for gas contact, maintaining open flow paths through the center of the channels and minimizing pressure drop while still achieving effective catalysis.
Solution Approach 2:
The porosity of the monolithic substrate is optimized (30-70%) to balance heat transfer efficiency and gas flow resistance. By controlling the pore size and distribution parameters, the structure allows sufficient heat conduction to reduce temperature gradients while maintaining low flow resistance for the reaction gas.
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 catalyst structure improves heat transfer performance, reduces temperature gradients, pressure loss, and flow resistance, while enhancing long-term durability by preventing sintering of active metals.
Implementation Method 1
the substrate includes silicon carbide (SiC), silicon nitride (Si3N4), a metallic silicon (Si)-silicon carbide (SiC) composite, a metallic silicon (Si)-silicon nitride (Si3N4) composite, or a combination thereof
Implementation Method 2
reforming the reaction gas through an endothermic reaction to prepare the synthetic gas
Data Source
AI summary
A catalyst structure for preparing synthetic gas includes a substrate including flow paths partitioned by partition walls, and catalytic material disposed on the surface of the partition walls of the substrate and including a metal oxide carrier and metal active particles supported on the metal oxide carrier, wherein the substrate includes silicon carbide (SIC), silicon nitride (Si3N4), a metallic silicon (Si)-silicon carbide (SIC) composite, a metallic silicon (Si)-silicon nitride (Si3N4) composite, or a combination thereof.