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Related Experiment Video

Updated: Mar 23, 2026

Adsorption Device Based on a Langatate Crystal Microbalance for High Temperature High Pressure Gas Adsorption in Zeolite H-ZSM-5
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Note: Molecular diffusivity in a small pore zeolite measured by a variable pressure (piezometric) uptake method.

Fei Wang1, Yasukazu Kobayashi1, Usman Muhammad1

  • 1Department of Chemical Engineering, Tsinghua University, Beijing 100084, China.

The Review of Scientific Instruments
|April 3, 2016
PubMed
Summary

This study introduces a numerical method to measure molecular diffusivity in zeolites using adsorption isotherm data. This approach simplifies diffusivity measurement, making it accessible without specialized equipment.

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Area of Science:

  • Materials Science
  • Chemical Engineering
  • Physical Chemistry

Background:

  • Zeolites are crucial porous materials for gas storage and separation.
  • Accurate measurement of molecular diffusivity within zeolites is essential for optimizing their performance.
  • Existing methods for diffusivity measurement can be complex and require specialized instrumentation.

Purpose of the Study:

  • To develop a simplified method for measuring molecular diffusivity in zeolites.
  • To demonstrate that diffusivity can be determined from adsorption isotherm data.
  • To extend the modeling approach to zeolites with surface barriers.

Main Methods:

  • Utilized numerical analysis to solve the diffusion equation within the uptake method.
  • Obtained diffusivity data from the measurement of adsorption isotherms.
  • Developed a model applicable to zeolites with variable external pressure and surface barriers.

Main Results:

  • Successfully measured molecular diffusivity in zeolites under variable pressure conditions.
  • Demonstrated that diffusivity can be accurately determined from standard adsorption isotherm measurements.
  • Showcased how diffusivity varies with adsorbed concentration.
  • The developed model is applicable to zeolites with surface barriers.

Conclusions:

  • Adsorption isotherm measurements provide a straightforward route to determining molecular diffusivity in zeolites.
  • The numerical approach eliminates the need for specialized equipment or procedures for diffusivity measurement.
  • The method offers insights into the concentration-dependent nature of diffusivity and is adaptable to complex zeolite systems.