Iron-Based Catalyst for Direct CO2 to Olefin Conversion
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Solution Overview
Problem
There is no commercial process for directly converting carbon dioxide to olefins, requiring a novel catalyst and conversion conditions to bypass the need for carbon monoxide as an intermediate.
Innovation Solution
An iron-based catalyst comprising 70 mol% to 97 mol% of porous FeO(OH)x, with x being 1 or 2, and 3 mol% to 30 mol% of an alkaline metal compound, which is used to hydrogenate carbon dioxide directly into olefins, optimizing specific surface area, pore volume, and average pore size for efficient conversion.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If conventional carbon monoxide-based hydrogenation process is used, then the process is well-established and reliable, but it cannot directly convert carbon dioxide to olefins and requires additional conversion steps
Solution Approach 1:
The patent extracts and eliminates the carbon monoxide intermediate step from the conventional process. By using an iron-based catalyst that directly converts carbon dioxide to olefins, the process removes the need for separate carbon monoxide generation and conversion steps, simplifying the overall manufacturing process while achieving the desired direct conversion capability
Solution Approach 2:
The patent changes the catalytic parameters by introducing an iron-based catalyst with specific composition (70-97 mol% porous FeO(OH)x and 3-30 mol% alkaline metal compound). This parameter change enables the catalyst to activate and convert carbon dioxide directly without requiring carbon monoxide as an intermediate, thus simplifying the process while maintaining reliability
2Productivity
If carbon dioxide is converted to olefins via carbon monoxide intermediate, then the conversion pathway is established, but the overall conversion rate remains below 50%
Solution Approach 1:
The patent introduces an iron-based catalyst as a new intermediary that facilitates direct conversion of carbon dioxide to olefins. This catalyst acts as a mediator that enables the reaction to proceed through a different pathway with higher efficiency, achieving conversion rates of 50-80% by eliminating the limitations of the carbon monoxide intermediate route
Solution Approach 2:
The patent employs a composite catalyst system combining porous FeO(OH)x with alkaline metal compounds. This composite material synergistically enhances the conversion efficiency, where the porous structure provides high surface area and the alkaline metal compounds promote carbon dioxide activation, together achieving superior conversion rates and productivity
3Ease of manufacture
If a novel iron-based catalyst is developed for direct carbon dioxide conversion, then direct conversion capability is achieved, but the catalyst composition and preparation method become complex
Solution Approach 1:
The patent utilizes porous FeO(OH)x as the base catalyst material, where the porous structure provides high surface area for reaction sites. This porous framework simplifies the overall catalyst design by providing a stable, easily preparable support structure that facilitates direct carbon dioxide conversion without requiring overly complex compositions
Solution Approach 2:
The patent applies local quality by loading alkaline metal compounds specifically on the porous FeO(OH)x surface in controlled amounts (3-30 mol%). This localized enhancement at specific sites of the catalyst provides the necessary activity for direct conversion while keeping the overall catalyst composition manageable and easier to manufacture
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 iron-based catalyst achieves a conversion rate of 50 to 80% of carbon dioxide to olefins, with yields of CnH2n and CnH2n+2 ranging from 45 to 75%, significantly improving upon conventional methods that typically have conversion rates below 50%.
Implementation Method 1
porous FeO(OH)x, wherein x is 1 or 2... optimizing specific surface area, pore volume, and average pore size for efficient conversion
Implementation Method 2
3 mol% to 30 mol% of alkaline metal compound loaded on the porous FeO(OH)x... directly converting carbon dioxide to olefins
Implementation Method 3
method of hydrogenating carbon dioxide, including contacting carbon dioxide and hydrogen with an iron-based catalyst to form CnH2n, CnH2n+2
Data Source
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AI summary
A method of hydrogenating carbon dioxide, including contacting carbon dioxide and hydrogen with an iron-based catalyst to form CnH2n, CnH2n+2, or a combination thereof, wherein n is 1 to 9, and the iron-based catalyst includes 70 mol% to 97 mol% of porous FeO(OH)x (wherein x is 1 or 2), and 3 mol% to 30 mol% of alkaline metal compound loaded onto the porous FeO(OH)x.