d0 Metal-Oxo Electrocatalyst Ambient Methane Functionalization
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Solution Overview
Problem
Current methods fail to efficiently convert methane (CH4) into liquid chemicals at ambient conditions with minimal infrastructure, and selective electrochemical activation of CH4 has not been demonstrated effectively.
Innovation Solution
The use of a d0 metal-oxo catalyst, specifically vanadium (V)-oxo, in an electrochemical system at room temperature and ambient pressure to functionalize CH4 into methyl bisulfate, achieving low activation energy and high turnover numbers, with the catalyst remaining active in aqueous solutions with low sulfuric acid concentrations.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Temperature
If conventional catalytic methods are used for methane conversion, then high temperatures and pressures are required, but this increases energy consumption and infrastructure requirements
Solution Approach 1:
The invention changes the fundamental reaction parameters by using electrochemical potential instead of thermal energy to drive methane activation. The d0 metal-oxo catalyst enables the reaction to proceed at ambient temperature and pressure by facilitating electron transfer processes that lower the activation energy barrier, thus eliminating the need for high-temperature and high-pressure conditions while reducing energy consumption
Solution Approach 2:
The invention replaces the thermal-mechanical activation system (heating and pressurization equipment) with an electrochemical system. Electricity is used to generate reactive oxygen species and activate the catalyst, substituting mechanical/thermal energy input with electrical energy input, which can be more efficiently controlled and delivered
2Manufacturing precision
If electrochemical activation is used, then selective functionalization can be achieved, but ambient selective electrochemical activation of CH4 has not been demonstrated
Solution Approach 1:
The d0 metal-oxo complex acts as an intermediary that mediates between electricity and methane. It accepts electrons from the electrochemical system and transfers them to methane in a controlled manner, enabling selective activation. The catalyst's specific electronic structure (d0 configuration) allows it to stabilize reaction intermediates and guide the reaction toward desired products while maintaining reliability through its robust coordination sphere
Solution Approach 2:
The invention uses composite catalytic systems combining d0 metal centers (Ti(IV), V(V), Cr(VI)) with oxo ligands and appropriate supporting ligands. This composite structure provides both the electrochemical activity needed for reliable electron transfer and the geometric/electronic properties required for selective methane functionalization, achieving both selectivity and reliability simultaneously
3Force
If d0 metal-oxo catalyst is used at ambient conditions, then low activation energy is achieved, but catalyst stability in aqueous solutions is challenged
Solution Approach 1:
The catalyst design employs local quality protection by creating a hydrophobic pocket or coordinating environment around the sensitive d0 metal-oxo center. The supporting ligands are chosen to provide local stabilization through their electronic and steric properties, protecting the metal-oxo bond from unwanted hydrolysis while allowing substrate access. This local protection strategy maintains catalyst stability in aqueous media without compromising the low activation energy pathway
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 allows for the efficient conversion of methane and natural gas into liquid chemicals at ambient conditions, with high turnover frequencies and Faradaic efficiencies, enabling the potential for on-site liquefaction and conversion of methane at remote locations with minimal infrastructure, reducing greenhouse gas emissions.
Implementation Method 1
Electrokinetic analysis showed a turnover-limiting step (TLS) of one-electron oxidation of vanadium (V)-oxo catalyst
Implementation Method 2
In the TLS, oxygen radical cation was generated in the sulfonic ligand of vanadium (V)-oxo catalyst, which is reactive towards CH4
Implementation Method 3
Electrochemistry could be a possible strategy because electrochemical charge transfer is capable of generating intermediates with high reactivity
Implementation Method 4
use of d0 metal-oxo in an electrochemical system realizes CH4 functionalization at room temperature and ambient pressure with low activation energy
Data Source
AI summary
The present disclosure relates generally to electrocatalytic process for conversion of a hydrocarbon reactant, comprising: introducing the hydrocarbon reactant into an acidic solution in a presence of a catalyst, wherein the catalyst includes a d° transition metal-oxo moiety; and applying an electrical input to the catalyst to convert the hydrocarbon reactant into a product. The present disclosure also relates to a catalyst for conversion of a hydrocarbon reactant, comprising a d° transition metal-oxo moiety and a sulfonic moiety bonded to the d° transition metal.