Carbon Sequestration Catalyst for Dry Reforming
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Solution Overview
Problem
Current dry reforming processes face challenges due to high endothermicity and carbon deposition, which limits industrial applications and greenhouse gas emission reduction.
Innovation Solution
A carbon sequestration and dry reforming process using a two-dimension carbon sequestration catalyst that maximizes carbon deposition and recovery, involving a reactant gas mixture of carbon dioxide and organic materials, with catalysts like iron-based materials and active metals on non-porous supports, to produce synthesis gas and solid carbon particles.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If dry reforming is used to produce synthesis gas, then hydrogen and carbon monoxide are generated, but carbon deposition occurs on the catalyst
Solution Approach 1:
The patent converts the harmful carbon deposition into a beneficial process by using the deposited carbon as a product. The catalyst promotes the Boudouard reaction (2CO → CO2 + C) to deliberately form solid carbon particles, which are then recovered and sold as a valuable product, transforming the previously harmful carbon deposition into a useful output that reduces greenhouse gas emissions.
Solution Approach 2:
The patent implements a recovery system for solid carbon particles deposited on the catalyst. The carbon is mechanically removed from the catalyst surface and collected as a recoverable product. This recovery approach allows the carbon that would otherwise be wasted or cause catalyst deactivation to be captured and utilized, addressing both the carbon deposition problem and creating a valuable byproduct.
2Reliability
If high temperature is used to drive endothermic dry reforming reactions, then reaction feasibility improves, but energy consumption increases
Solution Approach 1:
The patent employs a continuous process where the catalyst is continuously exposed to reactant gases, and the solid carbon formed is continuously removed. This continuous operation allows the exothermic oxidation of carbon to continuously regenerate active catalyst sites, maintaining high reaction feasibility without requiring prolonged high-temperature exposure, thus reducing overall energy consumption while sustaining productivity.
Solution Approach 2:
The patent utilizes the temperature-dependent nature of the Boudouard reaction to optimize performance. By controlling the temperature range and utilizing the exothermic oxidation step, the process achieves favorable equilibrium conditions for carbon formation at lower temperatures than conventional dry reforming, reducing the energy input required while maintaining reaction feasibility and carbon recovery efficiency.
3Productivity
If conventional catalysts are used for dry reforming, then synthesis gas is produced, but catalyst deactivation occurs due to carbon formation
Solution Approach 1:
The patent extracts the solid carbon from the catalyst surface through mechanical removal systems. By continuously taking out the deposited carbon, the catalyst surface is maintained clean and active, preventing the deactivation that would otherwise occur from carbon accumulation. This extraction approach allows the catalyst to maintain its productivity over extended periods.
Solution Approach 2:
The patent employs pre-treatment steps including oxidation of the catalyst surface and controlled carbon deposition phases before actual synthesis gas production begins. These preliminary actions prepare the catalyst surface to favor carbon formation over synthesis gas production initially, allowing subsequent carbon removal to restore activity, thereby extending catalyst lifespan and improving stability during continuous operation.
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 process effectively sequesters carbon, reducing greenhouse gas emissions by maximizing carbon deposition and allowing for the mechanical recovery of solid carbon, enhancing the efficiency of dry reforming reactions and reducing catalyst deactivation.
Implementation Method 1
providing at least one catalyst for dry reforming the reactant gas mixture and sequestering carbon
Implementation Method 2
the CO is also partially converted into solid carbon through the reaction known as Boudouard reaction for CO disproportionation: 2CO(g)→CO2(g)+C(s)
Implementation Method 3
the reduction of carbon dioxide with methane is an endothermic reaction (ΔH298=+247 kJ·mol−1)
Data Source
AI summary
A carbon sequestration and dry reforming process for the production of synthesis gas and sequestered carbon from carbon dioxide. Two-dimension catalysts for sequestering carbon and a process to produce same. A method for activating two dimension catalysts.