Carbon Dioxide Reduction to Solid Carbon via Two-Stage Reaction
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Current methods for producing solid carbon, such as carbon nanotubes, are costly due to reliance on hydrocarbons and lack efficient utilization of abundant carbon oxides like carbon dioxide, which are often wasted and require expensive capture and sequestration processes.
Innovation Solution
A two-stage reaction process using carbon dioxide and a hydrogen-containing reducing agent to convert carbon monoxide into solid carbon, with water vapor recycling and condensation to control reaction conditions and catalysts like iron-based stainless steel, enabling the production of various solid carbon morphologies, including carbon nanotubes, at reduced costs.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Loss of energy
If hydrocarbons are used as carbon source for solid carbon production, then production cost is high, but carbon oxide utilization is poor
Solution Approach 1:
The patent converts carbon dioxide, which is typically a waste product requiring expensive capture and sequestration, into a valuable carbon source for producing solid carbon materials. By using carbon dioxide as feedstock instead of hydrocarbons, the process transforms an environmental burden into an economic opportunity, simultaneously reducing disposal costs and producing high-value carbon products.
2Object-affected harmful factors
If carbon dioxide capture and sequestration is implemented, then carbon dioxide emission is reduced, but production cost increases significantly
Solution Approach 1:
Instead of merely capturing and sequestering carbon dioxide as a waste management solution, the patent utilizes carbon dioxide as a feedstock for producing solid carbon materials. This approach converts the cost center of carbon capture into a value-generating process, where the same infrastructure that captures carbon dioxide also produces marketable carbon products, thereby reducing or eliminating sequestration costs.
Solution Approach 2:
The process enables carbon dioxide to serve dual purposes: it is captured from emissions and simultaneously utilized as a carbon source for product formation. The system essentially uses the captured carbon dioxide itself as the raw material for production, eliminating the need for separate sequestration infrastructure and reducing overall costs.
3Productivity
If conventional hydrocarbon pyrolysis is used, then solid carbon production is achieved, but carbon oxide waste is generated
Solution Approach 1:
Conventional pyrolysis starts with hydrocarbons and produces carbon oxides as waste products. The patent inverts this approach by starting with carbon oxides and producing solid carbon as the desired product. This fundamental reversal of the chemical transformation direction eliminates waste generation and creates a closed-loop process where carbon oxides that would normally be discarded become the primary feedstock.
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 effectively converts abundant carbon oxides into valuable solid carbon products, reducing production costs and eliminating disposal costs for carbon dioxide, while offering control over the morphology and purity of the solid carbon products.
Implementation Method 1
reacting a first feed mixture comprising carbon dioxide with a hydrogen-containing reducing agent under first reaction conditions and converting at least a portion of the first feed mixture to a first tail gas comprising carbon monoxide and water vapor
Implementation Method 2
condensing at least a portion of the water from the first tail gas to form a dried first tail gas
Implementation Method 3
reacting the dried first tail gas under second reaction conditions and converting at least a portion of the carbon monoxide in the dried first tail gas to solid carbon
Data Source
Figure 1
Figure 2
Figure 3
AI summary
A two-stage reaction process includes reacting gaseous carbon dioxide with a reducing agent to form carbon monoxide and water. At least a portion of the water is condensed to form a dry tail gas. The dry tail gas, with the possible addition of a reducing agent, reacts to convert at least a portion of the carbon monoxide to solid carbon and water. Other methods include reacting a feed gas mixture to form a reaction mixture, condensing water from the reaction mixture to form a dried reaction mixture, mixing the dried reaction mixture with a recirculating gas to form a catalytic converter feed gas mixture, flowing the catalytic converter feed gas mixture through a catalytic converter to form solid carbon and a tail gas mixture containing water, and flowing the tail gas mixture through a heat exchanger.