Ferromagnetic Carbon Catalyst Support via Cellulose Impregnation
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Solution Overview
Problem
Current catalyst carrier materials, such as those made from activated carbon or carbon nanofibres/nanotubes, face issues with mechanical strength, controlled chemical composition, and porosity, leading to instability and high costs, especially when using precious metals, and difficulties in separation and recycling.
Innovation Solution
A process involving impregnation of cellulose or cellulose-like bodies with metal compounds, followed by thermal treatment in an inert atmosphere to produce ferromagnetic carbon bodies with increased porosity and graphitic layers, encapsulating metals like iron, nickel, or cobalt, which are then used as catalyst supports with enhanced mechanical strength and surface area.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Area of stationary object
If activated carbon is used as carbon carrier, then it provides high porosity and surface area, but it has poor mechanical strength and uncontrolled chemical composition
Solution Approach 1:
The patent combines carbon carrier material with a structurally stable matrix material to form a composite catalyst body. The carbon material provides high surface area and porosity, while the matrix material provides mechanical strength and structural stability, resolving the contradiction between surface area and mechanical strength.
Solution Approach 2:
The patent controls the chemical composition by adjusting parameters such as carbon content, matrix material composition, and pore structure during the preparation process. This allows optimization of both surface area and mechanical strength through parameter control rather than using natural activated carbon with uncontrolled composition.
2Area of stationary object
If carbon nanofibres or nanotubes are used, then they provide high surface area, but they have difficulty in manufacturing bodies with controllable dimensions and poor mechanical strength
Solution Approach 1:
The patent uses porous carbon materials with controlled pore structures rather than carbon nanofibres or nanotubes. The porous structure provides high surface area while the material can be formed into bodies with controllable dimensions and improved mechanical strength through the matrix composite approach.
3Strength
If coconut shell carbon is used for fixed catalyst bed, then it provides high mechanical strength, but it has small accessible surface area
Solution Approach 1:
The patent creates a composite where carbon material (providing surface area) is combined with matrix material (providing mechanical strength). This allows achieving both high accessible surface area and high mechanical strength simultaneously, unlike using coconut shell carbon alone.
4Reliability
If precious metals are used as catalytically active materials, then they provide high catalytic activity, but they are expensive and difficult to separate when carrier particles disintegrate
Solution Approach 1:
The patent optimizes the mechanical strength and structural stability parameters of the catalyst body through controlled composition and preparation methods. This prevents particle disintegration during use and separation processes, thereby preventing precious metal loss while maintaining high catalytic activity.
Solution Approach 2:
The patent ensures that the catalytically active precious metals are securely anchored on specific active sites within the composite structure. This localized placement maintains high catalytic activity while the overall structural stability prevents metal loss during operation and separation.
5Ease of manufacture
If natural materials are used to manufacture activated carbon, then they are readily available, but the characteristics are hard to control and chemical composition is uncontrolled
Solution Approach 1:
The patent uses synthetic or semi-synthetic carbon materials with controlled composition rather than natural materials. Preparation parameters such as carbonization temperature, activation conditions, and matrix material composition are precisely controlled to achieve desired characteristics and chemical composition, sacrificing ease of manufacture for manufacturing precision.
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 ferromagnetic carbon bodies exhibit improved mechanical strength, controlled chemical composition, and increased porosity, enabling stable catalytic performance and efficient separation, while being cost-effective due to the use of renewable materials like cellulose and sugar.
Implementation Method 1
heating the impregnated bodies in an inert and substantially oxygen-free atmosphere at a temperature above 700°C, thereby reducing at least part of the at least one metal compound to the corresponding metal or metal alloy
Implementation Method 2
The use of such relatively long and straight carbon filaments as bodies with controllable dimensions is difficult
Data Source
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AI summary
The invention is directed to the production of metal-carbon containing bodies, which process comprises impregnating cellulose, cellulose- like or carbohydrate bodies with an aqueous solution of at least one metal compound, followed by heating the impregnated bodies in an inert and substantially oxygen-free atmosphere, thereby reducing at least part of the at least one metal compound to the corresponding metal or metal alloy.