Abstract
Ilmenite ore has been widely accepted to be a cost-effective oxygen carrier (OC) of Chemical Looping Combustion (CLC) for CO2 capture. The focus of this study is to investigate into the influences of chemical impact, thermal variation and ageing effect on microstructure and performance evolutions of ilmenite OCs. Iron element migration, crystallinity and morphology alterations, and irreversible change of chemical composition were identified to be the major aspects responsible for gradual microstructural evolutions of Ilmenite OCs. Iron element migration from bulk materials to particle surface, occurring during the oxidation step of redox cycles, was of temperature- and O2 concentration- dependences. A schematic diagram was developed to explain the pathways of irreversible iron migration and alteration of chemical composition in redox cycle reactions. By lowering phase interaction between Fe2TiO5 and TiO2, the cycled thermal shock (due to reaction and processing in CLC) promotes the iron element concentration on OC particle surface and the ilmenite OC reactivity. Long-term ageing at elevated temperature, as one of typical severe conditions in CLC, exhibits activation effects for ilmenite OCs, even though it causes increased crystallinity, denser particle structure and redistribution of Fe2TiO5-TiO2 phase
Original language | English |
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Article number | 107139 |
Journal | Fuel Processing Technology |
Volume | 228 |
DOIs | |
State | Published - Apr 2022 |
Bibliographical note
Funding Information:This research was supported by National Key R&D Program of China (No. 2018YFB0605401-04 ), “Entrepreneurship & Innovation Plan” of Jiangsu Province of China (2018), and Collaborative Research Projects between Southeast University and China Pharmaceutical University (No. 2242019K3DZ08 ). The authors gratefully acknowledge Prof. Zhenshan Li at Tsinghua University, who provided ilmenite ore for this investigation.
Funding Information:
This research was supported by National Key R&D Program of China (No. 2018YFB0605401-04), ?Entrepreneurship & Innovation Plan? of Jiangsu Province of China (2018), and Collaborative Research Projects between Southeast University and China Pharmaceutical University (No. 2242019K3DZ08). The authors gratefully acknowledge Prof. Zhenshan Li at Tsinghua University, who provided ilmenite ore for this investigation.
Publisher Copyright:
© 2021
Keywords
- Chemical-Looping Combustion
- Ilmenite oxygen carriers
- Microstructural evolution
- Redox cycle
- Thermal conditions
ASJC Scopus subject areas
- Chemical Engineering (all)
- Fuel Technology
- Energy Engineering and Power Technology