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Evaluation of Microstructural Changes and Performance Degradation in Iron-Based Oxygen Carriers during Redox Cycling for Chemical Looping Systems with Image Analysis
- Source :
- Industrial & Engineering Chemistry Research. 57:5529-5538
- Publication Year :
- 2018
- Publisher :
- American Chemical Society (ACS), 2018.
-
Abstract
- A coupled analysis of the reaction kinetics and microstructural changes of Fe2O3/Al2O3 oxygen carriers during redox reaction cycles for chemical looping systems was conducted. The microstructural changes in the oxygen carrier particles were investigated using an image analysis method with cross-sectional backscattered electron images, and microstructural information such as the particle size, porosity, and two-phase boundary between the iron oxide and pores was obtained. The microstructural changes and the degradation kinetics during redox cycles were investigated under various operating conditions (reaction temperatures, reduction times, oxygen partial pressures during the oxidation process, and weight ratios of the oxygen carriers). The degradation coefficient and the reaction enthalpy of the particles in the oxidation process are linearly related, implying that increasing the local temperature of the oxygen carriers causes the coarsening of iron oxide particles via sintering and microstructural changes...
- Subjects :
- Materials science
020209 energy
General Chemical Engineering
Iron oxide
chemistry.chemical_element
Sintering
02 engineering and technology
General Chemistry
Partial pressure
021001 nanoscience & nanotechnology
Redox
Oxygen
Industrial and Manufacturing Engineering
Chemical kinetics
chemistry.chemical_compound
chemistry
Chemical engineering
0202 electrical engineering, electronic engineering, information engineering
Particle size
0210 nano-technology
Chemical looping combustion
Subjects
Details
- ISSN :
- 15205045 and 08885885
- Volume :
- 57
- Database :
- OpenAIRE
- Journal :
- Industrial & Engineering Chemistry Research
- Accession number :
- edsair.doi...........c6720d338ff71ca8ac93d823a762167b