Group II Metal Ferrite Oxygen Carriers for CO2 Conversion
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Solution Overview
Problem
Current methods for converting CO2 to CO or synthesis gas using Group II metal ferrites face challenges such as high operating costs, environmental concerns with Ni-based catalysts, and instability of oxygen carriers in chemical looping dry reforming, as well as difficulties in coal gasification processes.
Innovation Solution
Development of novel Group II metal ferrites like Mg, Ca, Ba, and Sr ferrites as catalysts, oxygen carriers, and promoters for methane dry reforming, chemical looping dry reforming, and coal gasification, which operate efficiently at temperatures between 500° C to 1100° C, producing high yields of CO and H2 without nitrogen dilution.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If Ni-based catalysts are used for dry reforming, then catalytic activity is improved, but environmental concerns and deactivation issues arise
Solution Approach 1:
The patent replaces expensive Ni-based catalysts with Fe-based ferrite catalysts that are cheaper and more environmentally friendly. The ferrite catalysts undergo controlled deactivation and regeneration cycles, effectively replacing the need for permanent Ni catalysts with a disposable-like system that is renewed through chemical looping.
Solution Approach 2:
The patent changes the chemical composition parameters by using ferrite compounds (Fe2O3, Fe3O4) instead of Ni-based catalysts. This parameter change maintains catalytic activity while eliminating the harmful environmental effects and deactivation issues associated with Ni, through controlled oxidation-reduction cycles.
2Productivity
If chemical looping dry reforming is used, then CO2 conversion is improved, but oxygen carrier instability occurs
Solution Approach 1:
The patent optimizes the oxidation-reduction potential parameters by carefully controlling the ferrite catalyst's oxidation state between Fe2O3 and Fe3O4. This parameter control ensures the oxygen carrier remains stable during cycling while maintaining high CO2 conversion capability.
Solution Approach 2:
The patent uses composite ferrite materials with controlled Fe oxide compositions that combine the benefits of high CO2 conversion with improved stability. The composite structure of ferrite compounds provides both the necessary reactivity for CO2 conversion and the stability required for sustained operation.
3Productivity
If high temperature operation is used, then reaction rate is improved, but operating costs increase
Solution Approach 1:
The patent changes the temperature parameter by operating at moderate temperatures (500-800°C) instead of high temperatures. This parameter change reduces energy consumption and operating costs while maintaining acceptable reaction rates through the use of ferrite catalysts that are active at these lower temperatures.
Solution Approach 2:
The patent uses inexpensive ferrite catalysts that can operate efficiently at lower temperatures, replacing expensive high-temperature processes. The ferrite catalysts provide sufficient activity at moderate temperatures, eliminating the need for high-temperature operation and associated high operating costs.
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 Group II metal ferrites demonstrate improved durability and reactivity, achieving high conversions of CO2 to CO and synthesis gas with reduced operating costs and environmental impact, while maintaining process stability and efficiency.
Implementation Method 1
the Group II metal ferrites are used as catalyst for methane dry reforming process with CO2 to produce synthesis gas
Implementation Method 2
chemical looping dry reforming with CO2 to produce CO
Implementation Method 3
chemical looping dry reforming with CO2 to produce CO
Implementation Method 4
Group II metal ferrites are used in coal gasification with CO2 to produce CO
Data Source
AI summary
The invention provides a use of metal ferrite oxygen carrier for converting carbon dioxide to carbon monoxide or synthesis gas via three processes: catalytic dry reforming of methane, chemical looping dry reforming of fuel and promoting coal gasification with CO2. The metal ferrite oxygen carrier comprises MzFexOy, where MzFexOy is a chemical composition with 0<x≤4, z>0 and 0<y≤6 and M is one of Ca, Ba, and/or combinations thereof. For example, MzFexOy may be one of CaFe2O4, BaFe2O4, MgFe2O4, SrFe2O4 and/or combinations thereof. In catalytic dry reforming, methane and carbon dioxide react in the presence of metal ferrites generating a product stream comprising at least 50 vol. % CO and H2. In another embodiment, chemical looping dry reforming process where metal ferrite is reduced with a fuel and then oxidized with carbon dioxide is used for production of CO from carbon dioxide. In another embodiment, the metal ferrite is used as a promoter to produce CO continuously from coal gasification with CO2.