Cobalt Methane Synthesis Catalyst Direct CO2 Conversion
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
The Fischer-Tropsch process typically requires carbon monoxide, which is less reactive than carbon dioxide, leading to inefficient energy consumption and high operating costs when using the reverse water gas shift reaction to convert carbon dioxide into carbon monoxide.
Innovation Solution
A cobalt-based Fischer-Tropsch synthesis catalyst is used to directly convert carbon dioxide and hydrogen into methane at lower temperatures, eliminating the need for the reverse water gas shift reaction and reducing energy consumption.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If the reverse water gas shift reaction is used to convert carbon dioxide to carbon monoxide, then carbon dioxide can be utilized in Fischer-Tropsch process, but the reaction requires exceptionally high temperatures (in excess of 900°C) and consumes excessive energy
Solution Approach 1:
The patent changes the reaction parameters by using a cobalt-based catalyst that enables carbon dioxide conversion to methane at lower temperatures (200-400°C) rather than the exceptionally high temperatures (in excess of 900°C) required for the reverse water gas shift reaction. This parameter change in temperature, facilitated by the specific catalyst, significantly reduces energy consumption while maintaining carbon dioxide utilization capability
Solution Approach 2:
The cobalt-based Fischer-Tropsch synthesis catalyst acts as an intermediary that facilitates the direct conversion of carbon dioxide and hydrogen to methane. This catalyst mediates the reaction, providing an alternative pathway that avoids the need for the energy-intensive reverse water gas shift reaction while still achieving carbon dioxide conversion
2Adaptability or versatility
If the reverse water gas shift reaction is used to convert carbon dioxide to carbon monoxide, then carbon dioxide can be utilized in Fischer-Tropsch process, but the process becomes operationally complex and costly
Solution Approach 1:
The patent extracts and eliminates the reverse water gas shift reaction step from the process sequence. By using a cobalt-based catalyst that enables direct carbon dioxide to methane conversion, the patent removes the need for the separate carbon dioxide to carbon monoxide conversion step, thereby simplifying the overall process architecture and reducing operational complexity
Solution Approach 2:
The patent merges the carbon dioxide conversion and hydrocarbon synthesis steps into a single integrated reaction process. Instead of separate steps for converting carbon dioxide to carbon monoxide and then to hydrocarbons, the cobalt-based catalyst enables direct conversion of carbon dioxide and hydrogen to methane in one step, simplifying the process
3Productivity
If conventional Fischer-Tropsch catalysts are used, then carbon monoxide can be converted to hydrocarbons, but carbon dioxide is less reactive and requires special treatment
Solution Approach 1:
The patent changes the catalyst parameters by using cobalt-based Fischer-Tropsch synthesis catalyst with specific composition (cobalt in the range of 1 wt % to 35 wt %) that is optimized for carbon dioxide activation. This catalyst parameter change enables direct conversion of carbon dioxide to hydrocarbons, overcoming the reactivity issue without requiring pre-treatment of carbon dioxide
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 methane selectivity and efficient conversion of carbon dioxide to methane at lower temperatures, reducing energy costs and operational complexity.
Implementation Method 1
contacting a gaseous mixture comprising hydrogen and carbon dioxide with a supported methane synthesis catalyst, the supported methane synthesis catalyst comprising cobalt in the range of 1 wt % to 35 wt %
Data Source
AI summary
The present disclosure relates generally to processes for the production of methane from hydrogen and carbon dioxide. In particular, the disclosure provides for a process for providing a product composition comprising methane. The process includes contacting a gaseous mixture comprising hydrogen and carbon dioxide with a supported methane synthesis catalyst, the supported methane synthesis catalyst comprising cobalt in the range of 1 wt % to 35 wt % on an elemental basis, to provide the product composition with a methane selectivity of at least 75%.