Journal article
Kinetics of antigorite dehydroxylation for CO2 sequestration
Minerals Engineering, Vol.184, Art. 107630
2022
Abstract
Heat-treatment of serpentine minerals generates structural amorphicity and increases reactivity during subsequent mineral carbonation, a strategy for large-scale sequestration of CO2. This study employs thermal analyses (TGA-DSC) in conjunction with in-situ synchrotron powder X-ray diffraction (PXRD) to record concurrent mass loss, heat flow, and mineralogical changes during thermal treatment of antigorite. Isoconversional kinetic modelling demonstrates that thermal decomposition of antigorite is a complex multi-step reaction, with activation energies (Eα) varying between 290 and 515 kJ mol−1. We identify three intermediate phases forming during antigorite dehydroxylation, a semi-crystalline chlorite-like phase (γ-metaserpentine) showing an additional reaction pathway for the decomposition of Al2O3-rich antigorite into pyrope, and two distinct amorphous components (α and β-metaserpentine) which convert into forsterite and enstatite at higher temperature, respectively. The combination of isoconversional kinetics with in-situ synchrotron PXRD illustrates, for the first time, that local crystal structure changes, related to intermediate phase and forsterite formation, are responsible for the steep increase in activation energy above 650 °C and only 49% dehydroxylation can be achieved prior to this increase. This suggests that the high thermal stability of Al2O3-rich antigorite would severely limit Mg extraction during application of mineral carbonation under flue gas conditions.
Details
- Title
- Kinetics of antigorite dehydroxylation for CO2 sequestration
- Authors/Creators
- S. Zahid (Author/Creator) - Murdoch UniversityH.C. Oskierski (Author/Creator)I. Oluwoye (Author/Creator)H.E.A. Brand (Author/Creator)F. Xia (Author/Creator)G. Senanayake (Author/Creator)M. Altarawneh (Author/Creator)B.Z. Dlugogorski (Author/Creator)
- Publication Details
- Minerals Engineering, Vol.184, Art. 107630
- Publisher
- Elsevier BV
- Identifiers
- 991005542566407891
- Copyright
- © 2022 Elsevier Ltd.
- Murdoch Affiliation
- Harry Butler Institute; School of Mathematics, Statistics, Chemistry and Physics
- Language
- English
- Resource Type
- Journal article
UN Sustainable Development Goals (SDGs)
This output has contributed to the advancement of the following goals:
Source: InCites
Metrics
104 Record Views
InCites Highlights
These are selected metrics from InCites Benchmarking & Analytics tool, related to this output
- Collaboration types
- Domestic collaboration
- Citation topics
- 2 Chemistry
- 2.165 Nanofibers, Scaffolds & Fabrication
- 2.165.1082 Calcium Carbonate Crystallization
- Web Of Science research areas
- Engineering, Chemical
- Mineralogy
- Mining & Mineral Processing
- ESI research areas
- Geosciences