Convective mixing fingers and chemistry interaction in carbon storage

Sáinz-García, Alvaro; Abarca, Elena; Nardí, Albert; Grandía, Fidel; Oelkers, Eric H.

doi:10.1016/j.ijggc.2016.12.005

Cited by 33 publications

(39 citation statements)

References 69 publications

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“…Using the definition of Da = k r Hμ ⋅ ( KΔρg ) −1 (second‐order reaction over convection), Ghesmat et al () noted that based on the type of aquifer, temperature, pressure, and salinity of the formation brine, Da must vary from 10 −2 to 10 5 for CO 2 sequestration process. It can only be deducted that the simulations in this work with Da im = k r a v , im H 2 ⋅ ( ϕD ) −1 = 1000 is in low range of Da im numbers with respect to 1.84 × 10 4 < Da < 1.84 × 10 9 of Sáinz‐Garcia et al () who used the same definition for the Damköhler number as used in this work.…”

Section: Simulation Parametersmentioning

confidence: 77%

“…We specifically focus on a two‐dimensional

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hypothetical reservoir overlaid by a layer of supercritical CO 2 as shown in Figure . Commonly dimensionless versions of the governing equations or dimensionless parameters are used (e.g., Islam et al, , and Sáinz‐Garcia et al, ) to address the uncertainties and account for the interplay between the strength of reactions and transport. The dimensionless parameters such as Rayleigh, Damköhler, and Péclet numbers help quantify the thresholds of the stability of boundary layer and underpin regime phase diagrams.…”

Section: Governing Equationsmentioning

confidence: 99%

“…The justifications are mainly based on Islam et al () that, using a full geochemistry model (full speciation transport) coupled with flow, concluded that negligible porosity and permeability increase due to the dissolution do not affect the hydrodynamics at all. Also based on the conclusions of Sáinz‐Garcia et al (), the range of Damköhler numbers chosen for this study will implicate negligible porosity and permeability increase in the system.…”

Section: Governing Equationsmentioning

confidence: 99%

“…Therefore, we assume a v , m = 0.1 a v , im . Three values of Da im = 1 and 100 and 1,000, are assigned in the simulations that correspond to lower bounds of reactive transport regimes as compared with Sáinz‐Garcia et al (). There is a lack of data for typical Da numbers in the context of CO 2 density‐driven convection.…”

Section: Simulation Parametersmentioning

confidence: 99%

“…More recently, Islam et al (2016) and Sáinz-Garcia et al (2017) made more numerically intensive efforts to relax the constraints of firstand second-order reactions that (over)simplify the geochemistry of CO 2 convection, or mixing ratio modeling. To this end, Islam et al (2016) coupled a geochemistry solver from (De Simoni et al, 2007), in an explicit sequential procedure, with the hydrodynamics of flow (solute transport solver).…”

Section: Water Resources Researchmentioning

confidence: 99%

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Convective‐Reactive CO₂ Dissolution in Aquifers With Mass Transfer With Immobile Water

Babaei

Islam

2018

Water Resources Research

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The objective of this paper is to study the impact of immobile water, its fraction, and its mass transfer with the flowing region on efficiency of CO2 dissolution in aquifers with an immobile water zone. A continuum scale code is developed with underlying assumptions of spatially homogeneous and temporally invariable partitioning fraction of the porous media, first‐order mass transfer between the mobile and immobile zones, and simplified reaction of CO2 aqueous solution with calcium carbonate rock. Using ranges of values for Damköhler number (Da), fraction of the total pore volume, and mass transfer coefficient rate (α), 96 simulations are conducted. It is shown that due to a lower intensity of reaction in the mobile region, intermediate values of α serve as a threshold below which the mass transfer coefficient is not affecting the overall CO2 storage and above which overall CO2 storage increases as a function of mass transfer coefficient. Additionally, we found that (i) when α is high and geochemistry is intensive (high Da), the overall CO2 storage decreases with increase in fraction of mobile water. This is because CO2 storage through consumption of rock in immobile water with higher geochemistry is reduced. (ii) When α is high but Da is low, the system is effectively a single porosity medium with no chemistry‐influenced discrimination between mobile and immobile zones, and therefore, overall CO2 storage increases with fraction of mobile water. (iii) When α is low, the magnitude of Da does not influence the overall CO2 storage.

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Section: Simulation Parametersmentioning

confidence: 77%

“…We specifically focus on a two‐dimensional

sans-serif-italicH

sans-serif-italicH

Section: Governing Equationsmentioning

confidence: 99%

Section: Governing Equationsmentioning

confidence: 99%

Section: Simulation Parametersmentioning

confidence: 99%

Section: Water Resources Researchmentioning

confidence: 99%

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Convective‐Reactive CO₂ Dissolution in Aquifers With Mass Transfer With Immobile Water

Babaei

Islam

2018

Water Resources Research

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MOFs‐Based Heterogeneous Catalysts: New Opportunities for Energy‐Related CO₂ Conversion

Lei

Xue

Chen

et al. 2018

Advanced Energy Materials

178

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www.advancedsciencenews.comreaction is more unfavorable. [22,23] Comparing to the researches on artificial H 2 production, the knowledge referring to efficient and selective reduction of CO 2 to energy-rich molecules is urgent to be updated. CO 2 conversion is often traced back to 1972 that reported by Honda and Fujishima with using inorganic photocatalysts TiO 2 . [24] As the capture of CO 2 has already been studied in metal-organic frameworks (MOFs), [25][26][27][28] it has recently been studied for their use as catalysts for the reduction of CO 2 into high-value chemicals. [14,29] MOFs hold great promise for applications in the field of CO 2 reduction, which can act directly as the catalysts or as components to promote CO 2 reduction in a hybrid catalytic system. The interior of MOFs can be designed to have open metal sites, specific heteroatoms, functionalized organic ligand, other building unit interactions, hydrophobicity, defects, porosity, and embedded nanoscale metal catalysts which is crucial for the development of better CO 2 reduction performance MOFs. [30][31][32] Due to the poor electron conductivity of MOFs, [33,34] and the inaccessibility of all the catalytic active sites to the reactants, the stability of MOFs in water and under UV light irradiation need to be further improved. We believe that a comprehensive and up-to-date review summarizing the recent applications of MOFs for CO 2 reduction will contribute to improve theoretical understanding of this field. In order to make a better achievement, it is necessary to use the MOF to build more complex materials to address CO 2 capacity and reduction ability together in one material. Future MOFs materials for CO 2 reduction should be economical and environmental friendly. The keys for promoting catalysis include structural defects in the MOFs, open metal sites from metal clusters, Lewis acid sites from the metal cluster and organometallic linker, and cocatalyst functionalized MOFs.Several reviews focusing on MOFs for CO 2 conversion have been recently reviewed and discussed. Dhakshinamoorthy et al. pointed out that photoexcitation of the light absorbing units in MOFs often generates a ligand-to-metal charge-separation state that can result in photocatalytic activity. Maina et al. discussed the corelationship between the properties of MOF materials including their CO 2 reduction catalytic performance under different reaction conditions. Li and co-workers have summarized the recent applications of MOFs for photocatalytic CO 2 reduction, in which MOFs can act as the photocatalysts for CO 2 reduction or as components in a hybrid photocatalytic system to promote CO 2 reduction. Yaghi and co-workers also pointed out that the challenge in developing catalysts for CO 2 photo-or electroreduction is rooted in the interplay between selectivity, activity, and efficiency. [35][36][37][38] Synthetic Approaches for MOFsMOFs, also called porous coordination polymers, are extended framework with open structures constructed from metal ions and organic ligands linked...

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Influence of interphase mass transfer and diffusion processes on CO2-brine displacement in saline aquifers

2019

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Convective mixing fingers and chemistry interaction in carbon storage

Cited by 33 publications

References 69 publications

Convective‐Reactive CO₂ Dissolution in Aquifers With Mass Transfer With Immobile Water

Convective‐Reactive CO₂ Dissolution in Aquifers With Mass Transfer With Immobile Water

MOFs‐Based Heterogeneous Catalysts: New Opportunities for Energy‐Related CO₂ Conversion

Influence of interphase mass transfer and diffusion processes on CO2-brine displacement in saline aquifers

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Convective mixing fingers and chemistry interaction in carbon storage

Cited by 33 publications

References 69 publications

Convective‐Reactive CO2 Dissolution in Aquifers With Mass Transfer With Immobile Water

Convective‐Reactive CO2 Dissolution in Aquifers With Mass Transfer With Immobile Water

MOFs‐Based Heterogeneous Catalysts: New Opportunities for Energy‐Related CO2 Conversion

Influence of interphase mass transfer and diffusion processes on CO2-brine displacement in saline aquifers

Contact Info

Product

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Convective‐Reactive CO₂ Dissolution in Aquifers With Mass Transfer With Immobile Water

Convective‐Reactive CO₂ Dissolution in Aquifers With Mass Transfer With Immobile Water

MOFs‐Based Heterogeneous Catalysts: New Opportunities for Energy‐Related CO₂ Conversion