Copper Tricopper Catalysts for Ambient Methane Oxidation
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Solution Overview
Problem
Current methods for converting methane to methanol are resource-intensive and costly, requiring high temperatures and pressures, and face challenges in achieving high yields and selectivity due to the inertness of the C—H bond in methane and issues with over-oxidation.
Innovation Solution
Development of copper catalysts with tricopper complexes and specific ligands that facilitate the oxidation of methane to methanol at ambient conditions, using oxidizing agents like hydrogen peroxide, which enables efficient regeneration of the catalyst and selective formation of methanol with high yields.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If conventional high temperature and pressure methods are used to convert methane to methanol, then the reaction can proceed, but the process becomes resource-intensive and costly
Solution Approach 1:
The patent changes the reaction parameters from high temperature and pressure conditions to ambient temperature and pressure conditions by introducing copper-based molecular catalysts. This parameter change enables the reaction to proceed under milder conditions, reducing energy consumption while maintaining productivity
Solution Approach 2:
The patent replaces the mechanical/thermal system (high temperature and pressure equipment) with a chemical catalytic system using copper-based molecular catalysts. This substitution eliminates the need for expensive high-pressure reactors and energy-intensive heating systems
2Productivity
If multiple conversion steps are used to convert methane to methanol, then the conversion can be achieved, but the process complexity and cost increase
Solution Approach 1:
The patent merges multiple conversion steps into a single direct oxidation step by using copper-based molecular catalysts. Instead of requiring separate steps for steam reforming, syngas generation, and methanol synthesis, the catalyst enables direct conversion of methane to methanol in one reaction step
Solution Approach 2:
The patent extracts and isolates the key catalytic function from the complex multi-step process. By identifying and utilizing the specific copper-based catalyst system, the invention removes the need for intermediate processing steps and directly achieves the desired transformation
3Productivity
If strong oxidation conditions are used to convert methane to methanol, then the reaction proceeds, but over-oxidation occurs reducing selectivity
Solution Approach 1:
The patent applies local quality by designing catalysts with specific ligand environments around the copper center. These ligands create a localized chemical environment that controls the oxidation strength, enabling sufficient oxidation of methane while preventing over-oxidation of the product methanol
Solution Approach 2:
The copper-based catalyst acts as an intermediary that mediates the oxidation process. It activates oxygen in a controlled manner and transfers oxygen atoms to methane selectively, preventing direct uncontrolled oxidation that would lead to over-oxidation and loss of selectivity
4Use of energy by moving object
If ambient conditions are used for methane oxidation, then energy consumption is reduced, but the C—H bond inertness prevents effective conversion
Solution Approach 1:
The patent replaces thermal energy input with chemical catalysis. Instead of using heat to overcome the C—H bond inertness, the copper-based catalysts provide an alternative reaction pathway with lower activation energy, enabling conversion at ambient temperatures
Solution Approach 2:
The copper-based catalyst acts as a mediator that facilitates the breaking of the inert C—H bond at ambient conditions. The catalyst provides a mechanism for oxygen activation and transfer that bypasses the high energy barrier associated with direct thermal oxidation
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 copper catalyst system achieves high catalytic efficiencies and selectivity for methanol production from methane, with yields greater than 75% and minimal over-oxidation, providing a viable pathway for converting natural gas to liquid fuels under ambient conditions.
Implementation Method 1
oxidation of hydrocarbons
Implementation Method 2
using oxidizing agents like hydrogen peroxide, which enables efficient regeneration of the catalyst
Implementation Method 3
copper catalysts with tricopper complexes and specific ligands that facilitate the oxidation of methane to methanol
Data Source
AI summary
This invention relates to molecular catalysts and chemical reactions utilizing the same, and particularly to molecular catalysts for efficient catalytic oxidation of hydrocarbons, such as hydrocarbons from natural gas. The molecular catalytic platform provided herein is capable of the facile oxidation of hydrocarbons, for example, under ambient conditions such as near room temperature and atmospheric pressure.