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Related Concept Videos

Adsorption Isotherms II01:25

Adsorption Isotherms II

Brunauer, Emmett, and Teller (BET) introduced a theory in 1938 that modified Langmuir's assumptions to explain multilayer physical adsorption. This theory is applicable to Type II isotherms and provides a more realistic picture of adsorption processes. The BET theory assumes a uniform solid surface with localized adsorption sites, where adsorption at one site doesn't affect adsorption at neighboring sites. This theory also allows for the possibility of additional molecules being adsorbed on top...
Physical Properties Affecting Solubility02:19

Physical Properties Affecting Solubility

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...
Adsorption of Gases on Solids01:28

Adsorption of Gases on Solids

Adsorption is a process where molecules, known as the adsorbates, accumulate on a surface, which is referred to as the adsorbent or substrate. Occurring at the solid-gas interface, this phenomenon is crucial in various scientific and industrial contexts. The reverse of adsorption is desorption.Two types of adsorptions exist: physical (physisorption) and chemical (chemisorption). Physisorption involves gas molecules held to the solid's surface by relatively weak intermolecular van der Waals...
Adsorption Isotherms I01:29

Adsorption Isotherms I

Adsorption isotherms are mathematical models that describe how molecules in a gas or liquid phase interact with surfaces. Two of the most common isotherm models are the Langmuir and Freundlich isotherms, which relate to Type I monolayer chemisorption. The Langmuir model is based on four key assumptions:• Adsorption cannot exceed monolayer coverage.• All surface sites are equivalent.• Molecules adsorb only at vacant sites.• There are no interactions between adsorbed molecules.Consider the...
Phase Transitions: Sublimation and Deposition02:33

Phase Transitions: Sublimation and Deposition

Some solids can transition directly into the gaseous state, bypassing the liquid state, via a process known as sublimation. At room temperature and standard pressure, a piece of dry ice (solid CO2) sublimes, appearing to gradually disappear without ever forming any liquid. Snow and ice sublimate at temperatures below the melting point of water, a slow process that may be accelerated by winds and the reduced atmospheric pressures at high altitudes. When solid iodine is warmed, the solid sublimes...
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Porosity and Absorption of Aggregate

Aggregates contain pores of varying sizes; while some are completely enclosed within the particles, others open onto the surface, allowing water to penetrate. The porosity of aggregates is a major factor contributing to the overall porosity of concrete, given that aggregates constitute about three-quarters of concrete's volume.
When all pores in an aggregate are filled with water, the aggregate is considered saturated and surface-dry. If left in dry air, water will evaporate until the aggregate...

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Related Experiment Video

Updated: Jul 4, 2026

A Uniaxial Compression Experiment with CO2-Bearing Coal Using a Visualized and Constant-Volume Gas-Solid Coupling Test System
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A Uniaxial Compression Experiment with CO2-Bearing Coal Using a Visualized and Constant-Volume Gas-Solid Coupling Test System

Published on: June 12, 2019

Adsorption Behavior and Storage Capacity Prediction of CO2 Injection into High-Rank Coal.

Jinxiao Yang1, Chen Guo2,3,4, Lingling Lu1

  • 1China Coal Aerial Survey and Remote Sensing Group Co., Ltd., Shaanxi 710100, China.

ACS Omega
|July 3, 2026
PubMed
Summary
This summary is machine-generated.

Carbon dioxide (CO2) geological sequestration in dual-porosity coal seams is key for carbon neutrality goals. This study quantifies CO2 adsorption and storage potential in anthracite, finding pressure enhances adsorption while temperature and water saturation decrease it.

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A Uniaxial Compression Experiment with CO2-Bearing Coal Using a Visualized and Constant-Volume Gas-Solid Coupling Test System
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Published on: August 2, 2018

Area of Science:

  • Geosciences
  • Environmental Science
  • Chemical Engineering

Background:

  • Carbon dioxide (CO2) geological sequestration is crucial for the "dual-carbon" initiative.
  • Coal seams with dual porosity offer favorable geological storage for CO2.
  • Understanding CO2 adsorption and storage capacity in coal is vital for injection feasibility.

Purpose of the Study:

  • To investigate CO2 adsorption behavior in high-rank coal.
  • To compare theoretical adsorption models and select the optimal one for storage capacity prediction.
  • To evaluate the CO2 storage potential of high-rank coal seams.

Main Methods:

  • Multi-physical field-coupled CO2 isothermal adsorption experiments on anthracite samples.
  • Comparison and selection of theoretical adsorption models (e.g., D-A model).
  • Development of estimation and predictive models for CO2 content and storage capacity.

Main Results:

  • CO2 adsorption increases with pressure (pre-supercritical) but decreases with temperature and water saturation.
  • The Dubinin-Astakhov (D-A) model accurately predicts CO2 adsorption in coal.
  • CO2 is primarily stored via adsorption, with state distribution influenced by temperature, pressure, and water saturation.

Conclusions:

  • CO2 storage capacity in coal reservoirs is determined by the synergistic evolution of adsorbed, dissolved, and free states.
  • Increasing burial depth favors free-state CO2 and reduces dissolved-state CO2.
  • This research provides a quantitative method for assessing CO2 injection feasibility and storage potential in high-rank coal seams.