Electrochemical Methane Conversion to Methanol at Low Temperatures
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Solution Overview
Problem
Conventional methods for converting methane to methanol are inefficient and costly due to high temperatures, low product yield, and the need for expensive oxidants or oxygen separation, limiting their practicality for large-scale production.
Innovation Solution
An electrochemical method using an electrochemical device with an anode and cathode electrodes and an electrolyte membrane, where organic compounds are oxidized by metal oxide cations at low temperatures, generating methanol and hydrogen without the need for oxygen separation, and the catalysts are regenerated electrochemically.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If conventional high temperature steam reforming and Fischer-Tropsch reaction are used to convert methane to methanol, then the conversion process can proceed, but the efficiency is only about 50-65% and the process is costly
Solution Approach 1:
The invention changes the temperature parameter from conventional high temperature (400-700°C) to low temperature (20-160°C), and changes the reaction mechanism from thermal catalysis to electrochemical oxidation, achieving over 90% conversion efficiency with minimal energy loss
Solution Approach 2:
The invention replaces the conventional thermal-mechanical conversion system (steam reforming at high temperature followed by Fischer-Tropsch reaction) with an electrochemical system using metal oxide cations as catalysts, eliminating the need for high temperature and pressure equipment
2Productivity
If methane is oxidized over solid catalysts at temperatures greater than 400°C, then the reaction can proceed, but methane is quite inert and requires high temperatures, and methanol is produced as an intermediate product limiting yield and selectivity
Solution Approach 1:
The invention changes the temperature parameter from >400°C to 20-160°C by introducing electrochemical activation of methane using metal oxide cations (Mn³⁺, Fe³⁺, Co³⁺, Ni³⁺, Ru³⁺, Rh³⁺, Ir³⁺, Pt³⁺) which can activate methane at low temperatures through electron transfer mechanisms
Solution Approach 2:
The invention introduces metal oxide cations as intermediary catalysts that facilitate the oxidation of methane to methanol at low temperatures, and introduces electrochemical regeneration as an intermediary process to continuously regenerate the metal oxide cations from their reduced forms
3Temperature
If strong oxidants such as N2O, hydrogen peroxide, and ozone are used to convert methane to methanol at lower temperatures, then the conversion can occur, but such oxidants are not practical for high volume production due to cost
Solution Approach 1:
The invention uses inexpensive, readily available metal salts (manganese sulfate, iron sulfate, cobalt sulfate, nickel sulfate, ruthenium chloride, rhodium chloride, iridium chloride, platinum chloride) as catalyst precursors that can be electrochemically regenerated, replacing expensive strong oxidants like N2O, H2O2, and O3
Solution Approach 2:
The invention discards the conventional approach of using consumable strong oxidants and instead implements a regeneration system where metal oxide cations are continuously regenerated from their reduced forms through electrochemical oxidation at the anode, making the process economically viable for large-scale production
4Device complexity
If direct conversion of methane to methanol is attempted, then the process is simpler, but oxygen separation from air is required and product yield and selectivity are low
Solution Approach 1:
The invention makes the electrolyte membrane serve multiple functions: it separates the anode and cathode compartments, enables ion transport for electrochemical regeneration, and facilitates the overall conversion process without requiring separate oxygen separation equipment
Solution Approach 2:
The invention introduces a electrolyte membrane as an intermediary component that enables the direct conversion process to achieve high yield and selectivity by facilitating the electrochemical regeneration of metal oxide cations and separating reaction compartments, eliminating the need for complex oxygen separation equipment
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 method allows for efficient and cost-effective conversion of methane to methanol at low temperatures, eliminating the need for oxygen separation and achieving high product yield, with the potential for scalable production and reduced NOx emissions.
Implementation Method 1
one or more organic compounds selected from the group consisting of alkanes, alkenes, alkynes, and aromatics is provided to the anode electrode, water is provided to the cathode electrode, and the electrochemical device is electrochemically overcharged at a temperature less than or equal to about 160° C., thereby producing a compound selected from the group consisting of alcohols, aldehydes, organic acids, and mixtures thereof
Implementation Method 2
H2 gas and hydroxide ions at the cathode electrode
Implementation Method 3
an electrochemical device having an anode electrode, a cathode electrode, and an electrolyte membrane disposed between the electrodes
Data Source
AI summary
A method for producing organic liquid fuels and other valuable products in which an organic compound is provided to an anode electrode having a metal oxide catalyst disposed on an anode side of an electrolyte membrane, thereby producing an organic liquid fuel and/or other valuable organic product and electrons on the anode side. The electrons are conducted to a cathode electrode disposed on a cathode side of the electrolyte membrane, thereby transforming water provided to the cathode side to H2 gas and hydroxide ions. The method is carried out at a temperature less than or equal to about 160° C., preferably at room temperature.