Plasma-Catalytic CO2 Methanation via Dielectric Barrier Discharge
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Solution Overview
Problem
Conventional thermochemical routes for carbon dioxide methanation require high temperatures, leading to energy inefficiency and the need for additional heating, which negates the advantages of plasma-catalytic processes.
Innovation Solution
A dielectric barrier discharge (DBD) device generates plasma to facilitate the conversion of carbon dioxide and hydrogen into methane using a catalyst comprising nickel on an alumina support, operating at low temperatures and ambient pressure without external heating.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If conventional thermochemical routes are used for carbon dioxide methanation, then high carbon dioxide conversion and methane selectivity can be achieved, but high temperature operation (200-500°C) is required leading to high energy expenditure
Solution Approach 1:
The invention changes the temperature parameter from conventional high temperatures (200-500°C) to low temperatures (below 100°C) by introducing plasma activation. This parameter change enables the reaction to proceed at ambient or near-ambient conditions, dramatically reducing energy expenditure while maintaining high carbon dioxide conversion and methane selectivity through the synergistic effect of plasma and nickel catalyst
Solution Approach 2:
The invention replaces the thermal activation mechanism with plasma activation. Instead of using thermal energy to drive the methanation reaction, the patent uses non-thermal plasma to generate reactive species that activate carbon dioxide and hydrogen molecules, enabling the reaction to proceed on the nickel catalyst surface at low temperatures without requiring high thermal energy input
2Productivity
If additional heating apparatus is used in plasma-catalytic processes, then carbon dioxide methanation can be achieved, but the competitive advantage of plasma (energy efficiency) is negated
Solution Approach 1:
The invention extracts and removes the additional heating apparatus from the plasma-catalytic system. By demonstrating that plasma activation alone is sufficient to enable high-rate carbon dioxide methanation on nickel catalyst at low temperatures, the patent eliminates the need for external heating devices, thereby maintaining the energy efficiency advantage of plasma technology while achieving productive methane synthesis
3Reliability
If conventional thermal catalysis is used, then carbon dioxide methanation can proceed, but the thermodynamically inert character of carbon dioxide cannot be overcome without high energy input
Solution Approach 1:
The invention introduces plasma as an intermediary that mediates between the thermodynamically inert carbon dioxide and the nickel catalyst. The plasma generates highly reactive intermediates (radicals, excited species) that can overcome the kinetic barriers of CO2 activation without requiring high thermal energy input, enabling reliable carbon dioxide conversion at low temperatures by providing an alternative reaction pathway through plasma-generated reactive intermediates
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 achieves high carbon dioxide conversion, methane selectivity, and energy efficiency, reducing energy consumption and enabling integration with renewable energy sources like wind and solar power.
Implementation Method 1
catalysis-assisted non-thermal plasma technology, which opens the prospect of energy-efficient carbon dioxide conversion, has been widely used to circumvent the inherent barriers of the thermal catalytic process. The energetic electrons can activate molecules via excitation, dissociation and ionization.
Implementation Method 2
a dielectric barrier discharge, DBD, device arranged to generate a plasma
Implementation Method 3
nickel and ruthenium have been demonstrated as the most effective metals in the thermochemical hydrogenation of carbon dioxide into methane
Implementation Method 4
carbon dioxide could be hydrogenated to value-added chemicals such as carbon monoxide, methane, methanol, ethanol, olefins and other hydrocarbons
Data Source
AI summary
An apparatus for forming methane from carbon dioxide and hydrogen is described. The apparatus comprises: a dielectric barrier discharge, DBD, device arranged to generate a plasma; and a passageway having an inlet for the carbon dioxide and the hydrogen and an outlet for the methane and including therein a catalyst comprising nickel and alumina. The passageway extends, at least in part, through the DBD device wherein, in use, the carbon dioxide is exposed to the catalyst in the presence of the hydrogen in the generated plasma, thereby forming the methane from at least some of the carbon dioxide and the hydrogen. A method, a use and a catalyst are also described.