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Tuning the Support Properties toward Higher CO2 Conversion during a Chemical Looping Scheme
Dewang Zeng1, Yu Qiu1, Li Ma1
1Key Laboratory of Energy Thermal Conversion and Control of Ministry of Education, School of Energy and Environment, Southeast University, Nanjing 210096, PR China.
Environmental Science & Technology
|September 3, 2020
Summary
New ion-conductive supports enhance chemical looping for efficient carbon dioxide conversion. These advanced materials significantly boost reactivity and stability in CO2 splitting processes.
Area of Science:
- Chemical Engineering
- Materials Science
- Catalysis
Background:
- Chemical looping offers superior CO2 conversion efficiency compared to photocatalytic and electrocatalytic methods.
- Conventional oxygen carriers using inert supports like Al2O3 face limitations in reactivity and stability due to sintering.
- A trade-off exists between the reactivity and stability of oxygen carriers in chemical looping processes.
Purpose of the Study:
- To develop novel supported oxygen carriers for enhanced CO2 conversion using ion-conductive materials.
- To investigate the impact of Gadolinium-doped Ceria (GDC) as a support on the performance of iron oxide-based oxygen carriers.
- To elucidate the mechanism behind improved CO2 splitting performance attributed to enhanced oxygen-ion conductivity.
Main Methods:
- Preparation of supported oxygen carriers using Fe2O3 and ion-conductive Gd-Ce-O (GDC) supports.
- Evaluation of CO2 conversion efficiency, CO productivity, and CO production rate.
- Assessment of material stability over multiple redox cycles (30 cycles).
- Mechanism study focusing on oxygen-ion conductivity and its correlation with performance.
Main Results:
- Fe2O3/GDC materials demonstrated significantly higher CO productivity and production rates compared to Fe2O3/Al2O3.
- The developed Fe2O3/Gd0.3Ce1.7O2-δ achieved approximately twofold higher performance than the conventional support.
- Materials maintained high performance and stability over 30 cycles of CO2 splitting.
- A linear relationship was identified between oxygen-ion conductivity and CO2 yield.
Conclusions:
- Ion-conductive GDC supports effectively enhance the reactivity and stability of oxygen carriers for chemical looping CO2 conversion.
- Enhanced oxygen-ion conductivity is the rate-limiting factor and key to improved CO2 splitting performance.
- The established relationship between conductivity and yield provides a predictive tool for selecting high-performance oxygen carriers.
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