SOFC Reactor for Methane Conversion and Hydrogen Removal
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Solution Overview
Problem
Current processes for converting methane to aromatic hydrocarbons are limited by thermodynamic equilibrium, which restricts methane conversion efficiency, and existing methods either remove hydrogen from the reaction chamber or rely on external hydrogen oxidation, leading to inefficiencies and additional steps.
Innovation Solution
A solid oxide fuel cell (SOFC) reactor is used to convert methane to aromatic hydrocarbons by in situ reacting hydrogen with oxygen ions to produce steam, shifting the equilibrium and enhancing conversion efficiency, while also generating electricity and suppressing carbon deposition.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If conventional catalytic reforming is used to convert methane to aromatic hydrocarbons, then aromatic products can be obtained, but methane conversion is limited by thermodynamic equilibrium
Solution Approach 1:
The patent combines the catalytic reforming reaction with a fuel cell oxidation reaction in a single integrated reactor system. The anode compartment performs methane-to-aromatics conversion while simultaneously oxidizing hydrogen at the anode surface, merging two functions (chemical conversion and energy generation) into one system to overcome thermodynamic limitations
Solution Approach 2:
The fuel cell reaction continuously removes hydrogen from the reaction zone by oxidizing it at the anode, maintaining a continuous shift in equilibrium toward higher conversion. This continuous removal of product (hydrogen) drives the reaction forward without interruption, enabling sustained high conversion rates
2Productivity
If hydrogen is removed from the reaction chamber using external methods, then methane conversion can be improved, but process complexity and additional steps are required
Solution Approach 1:
The hydrogen removal function is merged with the energy generation function by using the anode to simultaneously catalyze aromatic formation and oxidize hydrogen. This integration eliminates the need for separate hydrogen removal equipment, simplifying the overall process while maintaining high conversion efficiency
Solution Approach 2:
The anode surface automatically performs hydrogen oxidation as part of its catalytic function, making the system self-sufficient for hydrogen management. The fuel cell reaction inherently handles hydrogen removal without requiring external intervention or additional processing steps
3Loss of energy
If external hydrogen oxidation is used, then hydrogen can be removed from the system, but energy efficiency is reduced due to separate processing steps
Solution Approach 1:
The oxidation of hydrogen is merged with the main reaction process by occurring simultaneously at the anode surface. This co-location eliminates energy losses associated with transporting hydrogen to separate oxidation units and recovers energy directly at the source, improving overall energy efficiency
Solution Approach 2:
Hydrogen oxidation occurs continuously and simultaneously with the reforming reaction at the anode, maintaining continuous energy recovery without interruption. This continuous coupled action maximizes energy utilization efficiency by immediately converting hydrogen energy to electrical energy as it is produced
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 approach significantly increases methane conversion beyond thermodynamic limits, achieves high hydrogen removal rates, simplifies aromatics separation, and generates electricity, making the process more efficient and cost-effective.
Implementation Method 1
oxygen is transferred from one side of the walls to the other side to promote or inhibit a chemical reaction
Implementation Method 2
produced hydrogen is reacted in situ with oxygen ions transferred from the cathode compartment to produce steam
Implementation Method 3
produced hydrogen is reacted in situ with oxygen ions transferred from the cathode compartment to produce steam
Implementation Method 4
A solid oxide fuel cell (SOFC) reactor is used to convert methane to aromatic hydrocarbons by in situ reacting hydrogen with oxygen ions to produce steam, shifting the equilibrium and enhancing conversion efficiency, while also generating electricity
Implementation Method 5
Heat may be supplied to the reaction zone
Data Source
AI summary
A fuel cell reactor, preferably a solid oxide fuel cell (SOFC) reactor, for performing direct conversion of a hydrocarbon-containing gas to a higher hydrocarbons product is confined by walls, where reactants are flown in the anode compartments and air is introduced to the cathode compartments, and where oxygen is transferred from one side of the walls to the other side to promote or inhibit a chemical reaction. The process for direct conversion of a hydrocarbon-containing gas to a higher hydrocarbons product takes place in the anode compartment of the reactor, in which produced hydrogen, limiting the conversion to the equilibrium, is reacted in situ with oxygen ions transferred from the cathode compartment to produce steam, thereby removing the equilibrium-limiting hydrogen from the reaction.