COx Reduction Reactor Membrane Assembly for Gas-Phase Feed
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Solution Overview
Problem
Conventional electrochemical reactors face challenges in efficiently transporting COx to the catalyst surface due to low solubility in aqueous solutions and competing water reduction reactions, limiting industrial-scale production of valuable chemical products.
Innovation Solution
A novel electrochemical reactor design uses gas-phase COx supply and an ion-conducting polymer surrounding the COx conversion catalyst to minimize hydrogen formation, achieving efficient transport and high product production rates.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If COx is supplied dissolved in aqueous solution to conventional electrochemical reactors, then the reactor can operate with liquid-phase electrochemical reduction, but the transport of COx to the catalyst surface is poor due to low solubility
Solution Approach 1:
The patent changes the physical state of COx from dissolved liquid-phase to gas-phase supply, fundamentally altering the concentration parameter. Gas-phase COx provides much higher effective concentration at the catalyst surface compared to dissolved COx, directly resolving the solubility limitation and enabling high productivity.
Solution Approach 2:
The patent employs gas-phase flow dynamics to deliver COx to the catalyst surface. By using gas-phase COx supply with controlled flow rates, the system achieves efficient mass transport without being constrained by aqueous solubility, leveraging pneumatic principles to overcome the concentration limitation.
2Reliability
If conventional electrochemical reactors use aqueous electrolytes, then ionic conduction is enabled, but competing water reduction reactions occur that lead to hydrogen production instead of desired chemical products
Solution Approach 1:
The patent changes the ion conductor from aqueous electrolyte to solid polymer electrolyte. This parameter change eliminates water from the electrolyte phase, thereby eliminating the competing water reduction reaction that produces hydrogen, while maintaining ionic conduction through the solid polymer membrane.
Solution Approach 2:
The patent introduces a solid polymer electrolyte as an intermediary between the gas-phase COx supply and the catalyst. This intermediary enables ionic conduction without involving aqueous water, thus preventing hydrogen formation while still allowing the electrochemical reduction of COx to proceed.
3Productivity
If gas-phase COx is supplied to achieve efficient transport, then productivity increases, but the reactor design becomes more complex compared to conventional liquid-phase systems
Solution Approach 1:
The solid polymer electrolyte serves multiple functions simultaneously: it acts as the ion conductor, the physical barrier preventing water access, and the structural support for the catalyst layer. This multi-functionality reduces the number of separate components needed, thereby reducing overall device complexity despite the gas-phase operation.
Solution Approach 2:
The patent uses composite structures combining solid polymer electrolyte with catalyst particles. This composite approach integrates multiple functions within a single material system, simplifying the reactor design by eliminating the need for separate aqueous electrolyte reservoirs and gas-liquid separation components.
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 reactor achieves high energy efficiency, high current density, fast response time, and robustness, while providing flexibility in producing a variety of chemical products.
Implementation Method 1
The ion conducting polymer surrounding the COx conversion catalyst minimizes the competing hydrogen formation reaction
Implementation Method 2
Electrochemical reduction of COx (CO2, CO, or combinations thereof) combines just three inputs: COx, a source of protons, and electricity, and converts them into fuels, chemicals, and other products
Data Source
AI summary
A platform technology that uses a novel membrane electrode assembly, including a cathode layer, an anode layer, a membrane layer arranged between the cathode layer and the anode layer, the membrane conductively connecting the cathode layer and the anode layer, in a COx reduction reactor has been developed. The reactor can be used to synthesize a broad range of carbon-based compounds from carbon dioxide and other gases containing carbon.