COx Electrolyzer Anode Hydrogen Oxidation Mechanism
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Solution Overview
Problem
Current technologies for managing carbon dioxide emissions are inefficient, particularly in converting CO2 into useful products, and often require high temperatures and precious metal catalysts.
Innovation Solution
The system employs electrochemical carbon oxide reduction and hydrogen oxidation reactions using a COx electrolyzer with an anode, cathode, and membrane, where hydrogen produced by a water electrolyzer is fed to the anode for oxidation, and CO2 is reduced at the cathode to produce carbon-containing products.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If high temperatures and precious metal catalysts are used for CO2 conversion, then conversion efficiency is improved, but system complexity and cost increase
Solution Approach 1:
The patent replaces thermal catalytic conversion with electrochemical conversion. Instead of using high temperatures and precious metal catalysts, the invention uses electrochemical reactions at the cathode to convert CO2 into carbon-containing products, substituting a mechanical/thermal system with an electrochemical system that operates under milder conditions
Solution Approach 2:
The invention changes the operating parameters from high temperature thermal processes to ambient or moderate temperature electrochemical processes. By controlling electrical potential and current at the electrodes, the system achieves CO2 conversion without requiring the extreme temperatures and precious metal catalysts of conventional approaches
2Productivity
If high temperatures are used for CO2 conversion, then reaction rate is improved, but energy consumption increases
Solution Approach 1:
The patent replaces thermal energy input with electrical energy input. Instead of heating the system to high temperatures to achieve acceptable reaction rates, the invention uses electrochemical reactions driven by electrical potential applied to the electrodes, enabling CO2 conversion at much lower temperatures while maintaining productivity
Solution Approach 2:
The invention changes the energy input parameter from thermal energy (temperature) to electrical energy (voltage and current). This parameter change allows the reaction to proceed at ambient or moderate temperatures with controlled energy consumption through electrochemical pathways
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 achieves efficient conversion of CO2 into products like carbon monoxide and hydrocarbons with improved energy efficiency and reduced need for precious metal catalysts, offering a more effective management of carbon dioxide emissions.
Implementation Method 1
feeding water to a water electrolyzer to produce hydrogen (H2)
Implementation Method 2
feeding at least a portion of the H2 produced by the water electrolyzer to the anode of the COx electrolyzer to undergo hydrogen oxidation reaction at the anode
Implementation Method 3
the hydrogen oxidation reaction produces hydrogen ions that migrate through the membrane to the cathode
Implementation Method 4
feeding a carbon oxide to the cathode of the COx electrolyzer to undergo a reduction reaction, thereby producing the carbon-containing product
Data Source
AI summary
Provided herein are systems and methods for electrochemical COx reduction and hydrogen oxidation reactions to promote the reduction of carbon oxides (COx). Embodiments of the systems and methods may be used to produce carbon monoxide (CO) and water. In various embodiments, a reaction between carbon dioxide (CO2) and hydrogen gas (H2) occurs at the anode of a CO2 reduction electrolyzer, promoting the production of reduction products (e.g., CO). In some embodiments, the methods may utilize a feed stream of H2 gas from various sources. In some embodiments, a water electrolyzer upstream of the COx reduction electrolyzer is a source of H2 gas. In some embodiments, the systems and methods include downstream integration processes and related apparatus. In some embodiments, the downstream integration processes include Fischer-Tropsch processes.