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Related Concept Videos

Adsorption Isotherms II01:25

Adsorption Isotherms II

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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...
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Adsorption Isotherms I01:29

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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...
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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...
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Individual molecules in a gas move in random directions, but a gas containing numerous molecules has a predictable distribution of molecular speeds, which is known as the Maxwell-Boltzmann distribution, f(v).
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The Kinetic Model of Gases01:24

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The kinetic model of gases explains the properties of a perfect gas using three main assumptions: molecules move in ceaseless random motion, their size is negligible compared to the distances between them, and they do not interact except during perfectly elastic collisions. The total energy of a gas is the sum of the kinetic energies of all its constituent molecules. The pressure exerted by the gas arises from the continual bombardment of the container walls by billions of colliding molecules.
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Van der Waals Equation01:10

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The ideal gas law is an approximation that works well at high temperatures and low pressures. The van der Waals equation of state (named after the Dutch physicist Johannes van der Waals, 1837−1923) improves it by considering two factors.
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Modeling adsorption with lattice Boltzmann equation.

Long Guo1, Lizhi Xiao1, Xiaowen Shan1,2

  • 1State Key Laboratory of Petroleum Resources and Prospecting, China University of Petroleum, Beijing 102249, China.

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|June 4, 2016
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Summary
This summary is machine-generated.

A new lattice Boltzmann model simulates adsorption with realistic details, crucial for hydrogen storage and shale gas exploration. This computational approach enhances understanding of adsorption phenomena in industrial applications.

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Area of Science:

  • Computational Physics
  • Materials Science
  • Chemical Engineering

Background:

  • Adsorption theory is vital for industrial applications like hydrogen storage and shale gas exploration.
  • Existing models lack realism, failing to incorporate complex adsorbent structures and adsorbate hydrodynamics.
  • Current theoretical foundations, based on early 20th-century models, are insufficient for precise real-world simulations.

Purpose of the Study:

  • To develop and validate a novel computational model for simulating adsorption processes.
  • To incorporate adsorbate-adsorbate and adsorbate-adsorbent interactions with hydrodynamics.
  • To enable adsorption computations with realistic details for practical applications.

Main Methods:

  • A novel lattice Boltzmann model was developed and validated.
  • The model incorporates adsorbate-adsorbate and adsorbate-adsorbent interactions, including hydrodynamics.
  • Connections to the classic Ono-Kondo lattice theory were established.

Main Results:

  • The model successfully computes adsorption with real-life details, overcoming limitations of previous theories.
  • Various adsorption isotherms, including those beyond the standard IUPAC classification, were observed by varying a pseudo-potential.
  • The simulation accurately captures complex adsorption behaviors relevant to industrial applications.

Conclusions:

  • The developed lattice Boltzmann model provides a significant advancement in simulating adsorption phenomena.
  • This approach enables accurate predictions for critical applications such as hydrogen storage and shale gas exploration.
  • The framework offers new possibilities for studying the fundamental principles of adsorption.