Influence of Dissolved Iron in Solution on MgO Hydroxylation and Carbonation DOI
Juliane Weber,

Brittany Moseley,

Ke Yuan

и другие.

The Journal of Physical Chemistry C, Год журнала: 2024, Номер 129(1), С. 194 - 204

Опубликована: Дек. 21, 2024

MgO (periclase) is a promising material for direct air capture of CO2 using mineral looping process, but it unknown how impurities in the environment will affect uptake and hence process economics. Here, we investigated effects dissolved iron on extents hydroxylation subsequent carbonation reactions to determine if this has beneficial or detrimental effect. On single-crystal MgO, prevented hydration Mg(OH)2 (brucite) instead formed shell lepidocrocite (γ-FeOOH). This did not passivate as dissolution below was observed. During powders presence iron, formation brucite containing Fe(II) In addition, nanoscale oxides Fe(III) observed magnetometry Mössbauer spectroscopy. Subsequent experiments showed increased hydroxylated iron. Our results indicate that solute during may be MgO.

Язык: Английский

Carbonation of MgO Single Crystals: Implications for Direct Air Capture of CO2 DOI
Peng Yang, Jacquelyn N. Bracco,

Gabriela Camacho Meneses

и другие.

Environmental Science & Technology, Год журнала: 2025, Номер unknown

Опубликована: Фев. 10, 2025

Direct air capture (DAC) may be feasible to remove carbon dioxide (CO2) from the atmosphere at gigaton scale, holding promise become a major contributor climate change mitigation. Mineral looping using magnesium oxide (MgO) is potentially an economical, efficient, and sustainable pathway gigaton-scale DAC. The hydroxylation carbonation of MgO determine efficiency process, but their rates mechanisms remain uncertain. In this work, single crystals were reacted in or CO2 varying humidities characterized by X-ray scattering, microscopy, vibrational spectroscopy. Results show that formed brucite (Mg(OH)2)-like layer immediately after crystal cleaving. Concurrently, hydrated carbonate phases, including barringtonite (MgCO3·2H2O) nesquehonite (MgCO3·2H2O), layer. Rapid initial growth also manifested short-range bending/warping nanocrystallites, resulting multiple orientations same phases on surface. slowed down over time, indicating surface passivation. formation with 1:1 CO3/Mg ratio indicates efficient when compared other lower ratio. Our results are essential for understanding passivation tackling issue mineral DAC technology.

Язык: Английский

Процитировано

2
Passive direct air capture using calcium oxide powder: The importance of water vapor DOI Creative Commons
Lance Dostie, Kwon Rausis, Ian Power

и другие.

Journal of Cleaner Production, Год журнала: 2024, Номер 457, С. 142394 - 142394

Опубликована: Апрель 30, 2024

Calcium oxide (CaO; lime) looping is a proposed technology with the potential to capture gigatonnes of carbon dioxide (CO2) from atmosphere help mitigate climate change. The importance water in carbonation reactions widely understood as it needed for mineral and CO2 dissolution carbonate precipitation. However, effects vapor on CaO pathways rates have yet be elucidated systematic manner. Here, we examine impact relative humidity (RH) removal using powder at 20% 95% RH. Higher RH resulted faster hydration rates, forming Ca(OH)2 (portlandite); however, passivation limited all experiments, greatest occurring 80% (65% CaCO3; calcite). Thus, highly prone when drive carbonation. In swing was changed different times (hours or days) by amounts (e.g., 40–99%). Humidity swings can yield >85% CaCO3 complete low (<40%) occurs before high (∼99%). Importantly, separating these two processes yields nearly this case, achieved rate 1 t every 1.95 per day.

Язык: Английский

Процитировано

8
pH-dependent reactivity of water at MgO(100) and MgO(111) surfaces DOI
Narendra M. Adhikari, Piotr Zarzycki, Zhe-Ming Wang

и другие.

Physical Chemistry Chemical Physics, Год журнала: 2025, Номер unknown

Опубликована: Янв. 1, 2025

vSFG spectroscopy shows that water dipole reorientation occurs at the interface due to charge reversal MgO(100) and (111) surfaces pH above below PZC ∼ 12.

Язык: Английский

Процитировано

0
Inhibition of Reaction Layer Formation on MgO(100) by Doping with Trace Amounts of Iron DOI Creative Commons

Gabriela Camacho Meneses,

Juliane Weber, Raphaël P. Hermann

и другие.

The Journal of Physical Chemistry C, Год журнала: 2025, Номер unknown

Опубликована: Фев. 11, 2025

Despite extensive research on MgO's reactivity in the presence of CO2 under various conditions, little is known about whether impurities incorporated into solid, such as iron, enhance or impede hydroxylation and carbonation reactions. The purity MgO required for successful implementation looping a direct air capture technology affects deployment costs. With this motivation, we tested how iron impacts (100) passivation layer formation ambient conditions by using atomic force microscopy, electron synchrotron-based X-ray scattering. Based microprobe analysis, our samples were 0.5 wt % Mössbauer spectroscopy results indicated that 70% present Fe(II). We find even these low levels dopants impeded both at relative humidities (10%, 33%, 75%, >95%) (33%, surface. Crystalline reaction products formed. Reaction layers sample easily removed exposing to deionized water 2 min. Overall, findings demonstrate slows rate MgO, indicating without preferable mineral applications.

Язык: Английский

Процитировано

0
Decreasing Hygroscopicity Slows Forsterite Carbonation under Low-Water Conditions DOI
Bavan P. Rajan, Sebastian T. Mergelsberg, Mark Bowden

и другие.

Environmental Science & Technology, Год журнала: 2025, Номер unknown

Опубликована: Апрель 28, 2025

A fundamental understanding of processes that slow divalent metal silicate carbonation is important for developing effective strategies to durably store carbon dioxide and mitigate atmospheric CO2. This study presents a detailed investigation passivation effect unique low-water conditions during the forsterite (Mg2SiO4) highlights importance hygroscopicity in influencing carbonation. Integrated situ ex experimental results showed decrease rate observed after ∼10 h humid supercritical CO2 (50 °C, 90 bar) correlates with reduction water film thickness, particular, weakly hydrogen bonded adsorbed facilitates ion transport. We attribute thickness drop concentrations hygroscopic Mg2+, MgHCO3+, HCO3- ions within as predominate product evolves from amorphous magnesium carbonate (AMC) magnesite (MgCO3). When more soluble AMC present, are higher, drawing phase surface. Carbonation rates faster because thicker films can better mobilize growing carbonates. In contrast, when less predominates, lower, thinner, slower.

Язык: Английский

Процитировано

0
Engineering oxide ceramic fillers for thermal interface materials: Enhanced thermal conductivity and thixotropy through hydrophobated MgO/PDMS composite materials DOI Creative Commons
Ju Hyun Jeon, Su‐Jin Ha, Hyun‐Ae Cha

и другие.

Advanced Composites and Hybrid Materials, Год журнала: 2025, Номер 8(3)

Опубликована: Май 14, 2025

Язык: Английский

Процитировано

0
Atmospheric carbon dioxide removal using layers of lime DOI

Olivia Hawrot,

Phil Renforth

The Science of The Total Environment, Год журнала: 2025, Номер 985, С. 179761 - 179761

Опубликована: Май 27, 2025

Язык: Английский

Процитировано

0
Revealing the mechanism of MgO inhibiting the combustion of modified double-base propellants DOI
Chao Zhang, Xiaohong Zhang, Shuangyan Wu

и другие.

Fuel, Год журнала: 2024, Номер 381, С. 133632 - 133632

Опубликована: Ноя. 7, 2024

Язык: Английский

Процитировано

1
Iron Impurity Impairs the CO2 Capture Performance of MgO: Insights from Microscopy and Machine Learning Molecular Dynamics DOI
Ke Yuan, Nikhil Rampal, Sai Adapa

и другие.

ACS Applied Materials & Interfaces, Год журнала: 2024, Номер 16(46), С. 64233 - 64243

Опубликована: Ноя. 11, 2024

Magnesium oxide (MgO) is a promising sorbent for direct air capture (DAC) of carbon dioxide. Iron (Fe) common impurity in naturally occurring MgO and minerals used to produce MgO, yet molecular-scale understanding Fe-doping effects on carbonation lacking. Here, we observed reduced performance Fe-doped experimentally. The energetics adsorbing (bi)carbonate ion pristine MgO(001) surfaces were further investigated using ab initio machine learning potential molecular dynamics coupled with metadynamics simulations. Both exhibited basic (OH–) hydration layer, where the adsorption thermodynamically favorable. However, dissolution surface Fe had smaller energy barriers was more favorable than Mg. Leached likely neutralized near-surface basicity, yielding reactivity MgO. Our observations offer critical insights material selection emphasize importance evaluating geologic origin earth materials DAC.

Язык: Английский

Процитировано

1
Influence of Dissolved Iron in Solution on MgO Hydroxylation and Carbonation DOI
Juliane Weber,

Brittany Moseley,

Ke Yuan

и другие.

The Journal of Physical Chemistry C, Год журнала: 2024, Номер 129(1), С. 194 - 204

Опубликована: Дек. 21, 2024

MgO (periclase) is a promising material for direct air capture of CO2 using mineral looping process, but it unknown how impurities in the environment will affect uptake and hence process economics. Here, we investigated effects dissolved iron on extents hydroxylation subsequent carbonation reactions to determine if this has beneficial or detrimental effect. On single-crystal MgO, prevented hydration Mg(OH)2 (brucite) instead formed shell lepidocrocite (γ-FeOOH). This did not passivate as dissolution below was observed. During powders presence iron, formation brucite containing Fe(II) In addition, nanoscale oxides Fe(III) observed magnetometry Mössbauer spectroscopy. Subsequent experiments showed increased hydroxylated iron. Our results indicate that solute during may be MgO.

Язык: Английский

Процитировано

1