A5052242282- CO2 Sequestration and Geologic Interactions
- Carbon Dioxide Capture Technologies
- Chemical Looping and Thermochemical Processes
- X-ray Diffraction in Crystallography
- Magnesium Oxide Properties and Applications
- Recycling and utilization of industrial and municipal waste in materials production
- Geothermal Energy Systems and Applications
- Calcium Carbonate Crystallization and Inhibition
- Phase Equilibria and Thermodynamics
- Minerals Flotation and Separation Techniques
- High-pressure geophysics and materials
- Extraction and Separation Processes
- Zeolite Catalysis and Synthesis
- Nuclear Physics and Applications
- Thermal Expansion and Ionic Conductivity
- Recycled Aggregate Concrete Performance
- Municipal Solid Waste Management
- Industrial Gas Emission Control
- Metallurgical Processes and Thermodynamics
- Membrane Separation and Gas Transport
ETH Zurich
2018-2023
Board of the Swiss Federal Institutes of Technology
2021
CO2 capture and storage (CCS) is a technological solution to stabilize or even reduce the atmospheric concentration of greenhouse gas CO2, mitigate climate change. In this context, MgO promising solid sorbent, as energy penalty sorbent regeneration comparatively small, but it requires addition promoters, typically alkali metal nitrates, yield acceptable kinetics. Under operating conditions, promoters are in molten state. The main objectives work (i) assess experimentally validity different...
The addition of molten alkali metal salts drastically accelerates the kinetics CO2 capture by MgO through formation MgCO3 However, growth mechanism, nature formation, and exact role on process remain elusive, holding back development more-effective MgO-based sorbents. Here, we unveil mechanism under practically relevant conditions using a well-defined, yet representative, model system that is MgO(100) single crystal coated with NaNO3 interrogated in situ X-ray reflectometry coupled grazing...
The development of effective CO2 sorbents is vital to achieving net-zero emission targets. MgO promoted with molten salts an emerging class sorbents. However, the structural features that govern their performance remain elusive. Using in situ time-resolved powder x-ray diffraction, we follow dynamics a model NaNO3-promoted, MgO-based sorbent. During first few cycles capture and release, sorbent deactivates owing increase sizes crystallites, reducing turn abundance available nucleation...
The operation of dry processes for acid gas removal from flue in waste-to-energy plants based on the use calcium hydroxide as a solid sorbent generates waste stream containing fly ash, unreacted hydroxide, and products its reaction with pollutants (HCl SO2). To date, fate is to be put into landfill absence commercially viable recycling approaches. present study investigates potential these residues CO2 sorbents looping process. Samples collected different were tested over multiple...
We use pair distribution function analysis of<italic>in situ</italic>total scattering data and complementary techniques to reveal how molten NaNO<sub>3</sub>modifies the decomposition pathways of a hydrated magnesium carbonate formation MgO.
This work provides insight into the local structure of Na in MgO-based CO2 sorbents that are promoted with NaNO3. To this end, we use X-ray absorption spectroscopy (XAS) at K-edge to interrogate during capture (MgO + ↔ MgCO3). The analysis XAS data shows environment is altered upon MgO carbonation when compared NaNO3 as-prepared sorbent. We attribute changes observed carbonated sorbent an alteration NaNO3/MgCO3 interfaces and/or vicinity [Mg2+···CO32-] ionic pairs trapped cooled melt....
This work provides insight into the local structure of Na in MgO-based CO2 sorbents that are promoted with NaNO3. To this end, we use X-ray absorption spectroscopy (XAS) at K-edge to interrogate during capture (MgO + ↔ MgCO3). The analysis XAS data shows environment is altered upon MgO carbonation when compared NaNO3 as-prepared sorbent. We attribute changes observed carbonated sorbent an alteration NaNO3/MgCO3 interfaces and/or vicinity [Mg2+···CO32–] ionic pairs trapped cooled down melt....
This work provides insight into the local structure of Na in MgO-based CO2 sorbents that are promoted with NaNO3. To this end, we use X-ray absorption spectroscopy (XAS) at K-edge to interrogate during capture (MgO + ↔ MgCO3). The analysis XAS data shows environment is altered upon MgO carbonation when compared NaNO3 as-prepared sorbent. We attribute changes observed carbonated sorbent an alteration NaNO3/MgCO3 interfaces and/or vicinity [Mg2+···CO32–] ionic pairs trapped cooled down melt....
The addition of molten alkali metal salts drastically accelerates the kinetics CO 2 capture by MgO through formation MgCO 3 . However, growth mechanism, nature and exact role on CO2 process remains elusive, holding back development more effective MgO-based sorbents. Here, we unveil mechanism under practically relevant conditions using a well-defined, yet representative, model system that is MgO(100) single crystal coated with NaNO interrogated in situ X-ray reflectometry coupled grazing...
<p>The addition of molten alkali metal salts drastically accelerates the kinetics CO<sub>2</sub> capture by MgO through formation MgCO<sub>3</sub>. However, growth mechanism, nature MgCO<sub>3</sub> and exact role on CO2 process remains elusive, holding back development more effective MgO-based sorbents. Here, we unveil mechanism under practically relevant conditions using a well-defined, yet representative, model system that is MgO(100) single...