Membrane Reactor for CO2 Electrochemical Reduction
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Solution Overview
Problem
Existing electrolytic cells for electrochemical reduction of CO2 have low conversion efficiencies and flux, limiting their commercial application.
Innovation Solution
A membrane reactor design featuring a porous conductive layer with a trickle bed structure, a solid electrolyte separator, and specific catalyst materials, which enhances proton and electron transfer rates, and includes a fuel cell for efficient electrochemical reduction of CO2 to form useful products.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If electrolytic cells are used for electrochemical reduction of CO2, then the system is simple and operation conditions are mild, but conversion efficiency and flux are low
Solution Approach 1:
The patent employs a porous conductive layer as the cathode structure, which provides high surface area and enhanced mass transport pathways. The porous structure allows CO2 to diffuse efficiently to catalytic sites while maintaining electrical conductivity, thereby significantly improving conversion efficiency and flux compared to conventional electrolytic cells
Solution Approach 2:
The invention uses composite materials combining conductive polymers with metal catalysts in the porous cathode structure. This composite approach integrates the advantages of both materials: the conductive polymer provides electron transport and structural framework, while metal catalysts enhance CO2 reduction activity, resulting in high conversion efficiency while maintaining simple system fabrication
2Temperature
If electrolytic cells are used for electrochemical reduction of CO2, then operation conditions are mild, but flux is low
Solution Approach 1:
The porous conductive layer provides extensive internal surface area and interconnected pores that facilitate rapid CO2 diffusion and transport to active catalytic sites. This structure enables high flux of CO2 reduction products while maintaining mild operating conditions, as the enhanced mass transport occurs through the porous architecture rather than requiring extreme temperatures or pressures
3Device complexity
If conventional electrolytic cells are used, then system complexity is low, but conversion efficiency is low
Solution Approach 1:
The porous conductive cathode structure increases the effective surface area for CO2 reduction reactions without significantly increasing overall device complexity. The porous architecture naturally provides numerous reaction sites and improved mass transport, achieving high conversion efficiency while maintaining a relatively simple cell design
Solution Approach 2:
The invention changes the physical and chemical parameters of the cathode by using conductive polymers with specific electrical conductivity ranges (10^-6 to 10^6 S/cm) and controlled porosity. These parameter optimizations enhance electron transport and reactant diffusion, thereby improving conversion efficiency without requiring complex system modifications
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 membrane reactor achieves high conversion efficiency of CO2, with current efficiencies and conversion rates exceeding 80%, enabling the production of valuable organic substances and reducing energy consumption.
Implementation Method 1
a solid electrolyte separator (260) disposed in the cavity (20)
Implementation Method 2
The plurality of cathode catalyst particles (2204) are used to electrochemically reduce the CO2 gas
Implementation Method 3
enhances proton and electron transfer rates
Data Source
AI summary
A membrane reactor used for electrochemically converting a carbon dioxide gas into an expected product includes a cavity, a solid electrolyte membrane separator, a cathode, an anode, and a fuel cell. The solid electrolyte membrane separator is disposed in the cavity and divides the cavity into two chambers defined as a cathode chamber and an anode chamber. The cathode is disposed in the cathode chamber, and the anode is disposed in the anode chamber. The fuel cell is disposed outside the cavity to provide an electrolytic voltage. The fuel cell includes a fuel inlet, an oxidant inlet, and a reaction product outlet. The expected product includes a hydrogen gas and an oxygen gas. The hydrogen gas used as a fuel is fed in the fuel inlet, and the oxygen gas used as an oxidant is fed in the oxidant inlet for the fuel cell to produce electrical power.