Related Experiment Video
Updated: Jun 3, 2025
10:18
Dynamic Pore-scale Reservoir-condition Imaging of Reaction in Carbonates Using Synchrotron Fast Tomography
Published on: February 21, 2017
8.5K
Moisture-driven carbonation kinetics for ultrafast CO2 mineralization.
Yining Gao1,2, Yong Tao1,2, Gen Li1,2
1Department of Civil and Environmental Engineering, The Hong Kong Polytechnic University, Hong Kong 999077, China.
Summary
Water content critically influences CO2 mineralization efficiency. Optimal moisture levels enhance CO2 uptake via capillary condensation, while excessive water shifts reactions to mineral surfaces for ultrafast carbonation.
Area of Science:
- Earth and Environmental Sciences
- Materials Science
- Chemical Engineering
Background:
- CO2 mineralization is key for carbon sequestration and mitigating global warming.
- Water's role in CO2 mineralization is vital but not fully understood.
- Calcium-bearing minerals are crucial for this process.
Purpose of the Study:
- To elucidate the mechanisms of moisture-driven carbonation kinetics in calcium-bearing minerals.
- To understand how water content affects CO2 uptake and reaction pathways.
- To optimize CO2 mineralization strategies for decarbonization.
Main Methods:
- Combined experimental and atomistic simulation approach.
- Utilized a self-designed carbonation reactor with an ultrasonic atomizer for precise water control.
- Employed Grand Canonical Monte Carlo and metadynamics simulations.
Main Results:
- Maximum CO2 uptake occurs at optimal moisture (0.1-0.2 g/g) due to capillary condensation enhancing CO2 adsorption.
- Higher moisture content hinders CO2 diffusion into mineral pores.
- Very high moisture levels shift carbonation to the mineral surface, driven by dissolution.
Conclusions:
- Water plays a multifaceted role in mineral carbonation kinetics.
- Optimal moisture levels enable ultrafast adsorption-driven carbonation.
- Surface dissolution-driven carbonation occurs at high moisture levels, offering another ultrafast pathway.
More Related Videos
Related Concept Videos
01:24Carbonation Shrinkage
108
Atmospheric CO2 penetrates the concrete's pores and, in the presence of moisture, forms carbonic acid, which then reacts with calcium hydroxide in the hydrated cement, forming calcium carbonate. This process reduces the concrete's volume and is termed carbonation shrinkage.
The concrete's permeability is slightly reduced as calcium carbonate produced during the reaction fills its pores. Furthermore, its strength is slightly enhanced as the water released during the reaction...
The concrete's permeability is slightly reduced as calcium carbonate produced during the reaction fills its pores. Furthermore, its strength is slightly enhanced as the water released during the reaction...
108
01:09Turbulent Flow: Problem Solving
92
Carbonation is a process used to dissolve carbon dioxide gas in a liquid, commonly used in the production of carbonated beverages. Achieving efficient carbonation requires careful control of temperature, pressure, and flow conditions. By adjusting these parameters, carbonation efficiency can be maximized, producing a higher concentration of CO2 in the liquid.
Temperature is a key factor in CO2 solubility. In this case, the CO2 gas and the liquid are cooled to 20°C. Lower temperatures...
Temperature is a key factor in CO2 solubility. In this case, the CO2 gas and the liquid are cooled to 20°C. Lower temperatures...
92
02:19Physical Properties Affecting Solubility
22.4K
Solutions of Gases in Liquids
As for any solution, the solubility of a gas in a liquid is affected by the attractive intermolecular forces between solute and solvent species. Unlike solid and liquid solutes, however, there is no solute-solute intermolecular attraction to overcome when a gaseous solute dissolves in a liquid solvent since the atoms or molecules comprising a gas are far separated and experience negligible interactions. Consequently, solute-solvent interactions are the sole...
As for any solution, the solubility of a gas in a liquid is affected by the attractive intermolecular forces between solute and solvent species. Unlike solid and liquid solutes, however, there is no solute-solute intermolecular attraction to overcome when a gaseous solute dissolves in a liquid solvent since the atoms or molecules comprising a gas are far separated and experience negligible interactions. Consequently, solute-solvent interactions are the sole...
22.4K
04:01Factors Affecting Solubility
33.0K
Compared with pure water, the solubility of an ionic compound is less in aqueous solutions containing a common ion (one also produced by dissolution of the ionic compound). This is an example of a phenomenon known as the common ion effect, which is a consequence of the law of mass action that may be explained using Le Chȃtelier’s principle. Consider the dissolution of silver iodide:
33.0K
01:24Hydration of Cement
197
Hydration of cement is a chemical reaction between cement particles and water. This process occurs primarily through two mechanisms: through-solution and topochemical. In the through-solution process, anhydrous compounds dissolve into their constituents, hydrates form in the solution, and then precipitate from the supersaturated solution. The topochemical process involves solid-state reactions at the cement particle surface. The through-solution process dominates the topochemical process at the...
197
01:46The Calvin Benson Cycle
4.4K
Ribulose 1,5- bisphosphate carboxylase/oxygenase (RuBisCo) is a critical enzyme that catalyzes carbon dioxide assimilation during photosynthesis. However, it is an inefficient enzyme, having an extremely slow catalytic rate. A typical enzyme can process about a thousand molecules per second; however, RuBisCo fixes only around three-carbon dioxides per second. Photosynthetic cells compensate for this slow rate by synthesizing very high amounts of RuBisCo, making it the most abundant single...
4.4K