Structured Catalyst for Methane Reforming
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Solution Overview
Problem
Conventional steam methane reforming processes face challenges in efficiently transferring heat to the reactive zone of the catalyst bed, leading to slow heat transfer and large heat resistance, particularly in tubular reformers where heat transfer is the rate-limiting step.
Innovation Solution
A structured catalyst is developed using an electrically conductive macroscopic structure with a ceramic coating, manufactured by extrusion or 3D printing and sintering, which allows for uniform electrical resistance heating, enabling efficient thermal conduction and reducing carbon formation by creating a coherent oxide layer that supports catalytically active material.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Temperature
If conventional heat transfer methods (convection, conduction, radiation) are used in tubular reformers, then heat can be transferred to the catalyst bed, but heat transfer is slow and encounters large heat resistance, making it the rate-limiting step
Solution Approach 1:
The patent replaces conventional thermal convection and conduction heating mechanisms with electrical resistance heating. The catalyst support structure itself is made electrically conductive, allowing direct electrical heating of the catalyst bed, thereby eliminating the slow heat transfer limitations of conventional methods and enabling rapid temperature control.
Solution Approach 2:
The catalyst support structure serves dual functions: it provides mechanical support for the catalytically active material and simultaneously acts as an electrically conductive element for self-heating. This self-service capability allows the catalyst bed to generate its own heat directly where needed, eliminating the need for external heat transfer through reactor walls.
2Reliability
If a ceramic coating is applied to the macroscopic structure to support catalytically active material, then carbon formation is reduced and catalytic activity is enhanced, but the structure complexity increases
Solution Approach 1:
The patent employs a composite structure consisting of an electrically conductive macroscopic support (such as metal foam or sintered metal) coated with a ceramic layer. The ceramic coating provides chemical stability and resistance to carbon formation, while the conductive support enables electrical heating. This composite approach combines the advantages of different materials to achieve both thermal management and chemical resistance.
Solution Approach 2:
The ceramic coating is applied selectively to specific regions of the macroscopic structure where catalytically active material needs to be supported. This localized coating approach ensures that the ceramic layer is present only where needed for catalytic function and carbon resistance, rather than coating the entire structure uniformly, thereby reducing unnecessary complexity.
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
This solution enables rapid and uniform heating of the catalytically active material, reducing pressure drop and carbon formation, resulting in a compact reactor design with efficient heat transfer and fast startup capabilities, while maintaining a controlled temperature profile to optimize the steam methane reforming reaction.
Implementation Method 1
the macroscopic structure is arranged to conduct an electrical current to supply energy to the chemical reaction
Implementation Method 2
The close contact between the catalytically active material and the macroscopic structures enables efficient heating of the catalytically active phase from thermal conduction within the material of the resistance heated macroscopic structure and the ceramic coating supported on the macroscopic structure
Implementation Method 3
The macroscopic structure and the ceramic coating have been sintered in an oxidizing atmosphere in order to form chemical bonds between the ceramic coating and the macroscopic structure
Data Source
AI summary
The invention relates to a structured catalyst for catalyzing steam methane reforming reaction in a given temperature range T upon bringing a hydrocarbon feed gas into contact with the structured catalyst. The structured catalyst comprises a macroscopic structure, which comprises an electrically conductive material and supports a ceramic coating. The macroscopic structure has been manufactured by 3D printing or extrusion and subsequent sintering, wherein the macroscopic structure and the ceramic coating have been sintered in an oxidizing atmosphere in order to form chemical bonds between the ceramic coating and the macroscopic structure. The ceramic coating supports catalytically active material arranged to catalyze the steam methane reforming reaction, wherein the macroscopic structure is arranged to conduct an electrical current to supply an energy flux to the steam methane reforming reaction. The invention moreover relates to methods of manufacturing the structured catalyst and a system using the structured catalyst.