Electrochemical Methane Oxidation Cell Using Palladium Catalyst
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Current methods for converting methane to methanol are energy and capital intensive, making it difficult to employ at remote locations, and require expensive stoichiometric oxidants that are not easily regenerated, limiting their commercialization.
Innovation Solution
An electrochemical cell using a transition metal catalyst, such as palladium, in an acidic medium with oxygen as the oxidant, allowing for the conversion of methane to methanol at low temperatures and pressures, replacing expensive stoichiometric oxidants with O2 and achieving high selectivity and efficiency.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If current industrial methods for upgrading methane to methanol via syn gas are used, then methane can be converted to methanol, but the process becomes energy and capital intensive
Solution Approach 1:
The patent replaces the conventional thermal syn gas process with an electrochemical system that uses electrical energy to drive methane oxidation. The electrochemical cell uses a solid electrode to generate reactive oxygen species that oxidize methane to methanol, eliminating the need for high-temperature thermal processing and complex syngas conversion equipment.
Solution Approach 2:
The patent changes the operating parameters from high-temperature thermal conditions to mild electrochemical conditions. The process operates at significantly lower temperatures and pressures by using electrochemical potential to drive the reaction, thereby reducing energy consumption while maintaining productivity.
2Productivity
If stoichiometric oxidants are used for methane oxidation, then high conversion can be achieved, but the cost and disposal of oxidants becomes prohibitive
Solution Approach 1:
The patent implements a self-regenerating oxidant system where oxygen from air or pure O2 is reduced at the cathode to generate hydrogen peroxide or other reactive oxygen species. These species continuously oxidize methane at the anode, and the oxygen is regenerated from atmospheric or gaseous sources, eliminating the need to transport and dispose of stoichiometric chemical oxidants.
Solution Approach 2:
The patent introduces reactive oxygen species (such as hydrogen peroxide, superoxide, or hydroxyl radicals) as intermediaries that mediate the oxidation of methane. These intermediaries are generated in situ through electrochemical reduction of oxygen at the cathode, providing a sustainable oxidizing agent that avoids the costs associated with external stoichiometric oxidants.
3Manufacturing precision
If high-valent late transition metal elements in concentrated acid are used, then controlled oxidation with high selectivity is achieved, but the system faces hurdles in achieving high methane conversion and finding inexpensive regenerable oxidants
Solution Approach 1:
The patent employs a dual-function electrochemical cell where the same system simultaneously achieves high selectivity through controlled electrochemical oxidation and high conversion through continuous operation. The electrochemical approach allows precise control of oxidation state while maintaining high throughput by continuously supplying methane and regenerating oxidants.
Solution Approach 2:
The patent implements continuous operation of the electrochemical cell, maintaining steady-state conditions that allow both high selectivity and high conversion. The continuous supply of electrical energy enables sustained generation of reactive oxygen species, allowing the system to maintain high methane conversion rates while preserving selectivity through controlled electrochemical potential.
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 process achieves high methane conversion with >80% faradaic efficiency and produces methanol at temperatures as low as 80°C, enabling efficient utilization of stranded natural gas at remote locations with reduced operational costs.
Implementation Method 1
applying an electrical current between the anode and the cathode, thereby forming a product in which the carbon-hydrogen bond has been converted to a carbon-oxygen bond
Implementation Method 2
in an electrochemical cell comprising an anode and a cathode, combining a medium, the compound, and a transition metal catalyst
Implementation Method 3
combining a medium, the compound, and a transition metal catalyst, thereby forming a mixture; wherein the compound is an aliphatic compound or an aromatic compound, and the catalyst comprises a transition metal atom or ion
Implementation Method 4
applying an electrical current between the anode and the cathode, thereby forming a product
Data Source
AI summary
Disclosed are methods for the electrochemical oxidation of a C—H bond in a compound to give a C—O bond or C—S bond. The oxidation of methane to methanol is described, as well as an electrochemical cell for performing the reaction.