Carbon Oxide Conversion to Solid Carbon via Iron Catalyst
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Solution Overview
Problem
Current methods for capturing and sequestering carbon dioxide are economically costly and inefficient, as they rely on hydrocarbons rather than carbon oxides, which are abundant and inexpensive, and lack effective means to convert CO2 into valuable solid carbon products like carbon nanotubes.
Innovation Solution
A catalytic conversion process that concentrates carbon oxides, reacts them with reducing agents in the presence of an iron-based catalyst to produce solid carbon, with controlled water vapor partial pressure to influence the morphology of the carbon products, allowing for the formation of various allotropes and morphologies of solid carbon, including carbon nanotubes.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If conventional methods use hydrocarbons as carbon sources for solid carbon production, then solid carbon can be produced, but the process becomes economically costly and less efficient
Solution Approach 1:
The invention changes the carbon source parameter from hydrocarbons to carbon oxides (CO2 and CO), which are abundant and inexpensive. This parameter change fundamentally alters the economic and efficiency characteristics of the process while maintaining the ability to produce solid carbon products through catalytic conversion
Solution Approach 2:
The invention employs inexpensive catalysts such as iron, nickel, cobalt, and their alloys that can be used without requiring expensive support structures. These catalysts are readily available and can be deployed in simple reactor configurations, eliminating the need for costly additional supports and reducing overall manufacturing costs
2Ease of manufacture
If carbon oxides are used as carbon sources, then cost is reduced, but effective conversion into valuable solid carbon products like carbon nanotubes was previously unachieved
Solution Approach 1:
The invention introduces metal catalysts as intermediaries that facilitate the conversion of carbon oxides into solid carbon products. These catalysts mediate the chemical reaction between carbon oxides and reducing agents, enabling the formation of high-quality solid carbon structures including carbon nanotubes, graphite, and amorphous carbon that would not form directly from carbon oxides alone
Solution Approach 2:
The invention controls reaction parameters including temperature (400-900°C), pressure, and the partial pressure of water vapor to influence the morphology and crystallinity of the solid carbon products. By adjusting these parameters, the process achieves manufacturing precision comparable to or exceeding conventional hydrocarbon-based methods while using inexpensive carbon oxide feedstocks
3Manufacturing precision
If water vapor partial pressure is controlled during carbon oxide conversion, then carbon product morphology can be influenced, but process complexity increases
Solution Approach 1:
The invention incorporates water vapor management as an integrated part of the reaction process, where water produced during carbon oxide reduction is condensed and removed, and the resulting dry gas is recycled back to the reactor. This feedback loop naturally controls water vapor partial pressure without requiring complex external control systems, achieving morphology control through a self-regulating process
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 process provides a cost-effective and efficient method for converting carbon oxides into solid carbon products, such as carbon nanotubes, reducing atmospheric CO2 emissions and offering a valuable product for commercial use, while minimizing costs by using inexpensive catalysts and eliminating the need for additional supports.
Implementation Method 1
reacting them with reducing agents in the presence of an iron-based catalyst to produce solid carbon
Implementation Method 2
reacts them with reducing agents in the presence of an iron-based catalyst to produce solid carbon
Implementation Method 3
At least a portion of the water vapor produced in the catalytic converter is condensed and removed from the reaction product gas stream
Data Source
AI summary
Methods of capturing or sequestering carbon include introducing a reaction gas stream to a catalytic converter to convert a portion of the carbon in the carbon oxide to solid carbon and a tail gas stream containing water vapor, removing the solid carbon from the catalytic converter for use, disposal, or storage, and recycling at least a portion of the tail gas stream to the catalytic converter. Methods may also include removing a portion of the water from the tail gas stream. The tail gas stream includes a portion of the initial process gas stream and at least a portion of water vapor produced in the catalytic converter. Methods may also include removing water vapor from various streams and reacting the carbon oxide with a reducing agent in the presence of a catalyst. Systems for capturing or sequestering carbon from a gaseous source containing carbon oxides are also described.