Analyzing Clay Microporosity with Advanced Adsorption Methods
Author Information
Author(s): El Azrak Anwar, Grekov Denys I., Truche Laurent, Pré Pascaline
Primary Institution: IMT Atlantique, GEPEA, UMR CNRS 6144, F-44307 Nantes, France
Hypothesis
Cation exchange with TMA+ increases the microporosity of clays compared to their sodic form.
Conclusion
Cation exchange with TMA+ significantly enhances the sorption capacity of clays, increasing intra-particle microporosity surfaces by up to 30% for natural clays and between 10% and 18% for synthetic clays, compared to their sodic form.
Supporting Evidence
- Cation exchange with TMA+ induced a strong increase in the microporosity of clays relative to the corresponding Na-forms.
- The use of a reference curve that accounts for specific interactions created by surface heterogeneities induces minimal change in estimated values of micropore volumes.
- High-resolution Ar adsorption isotherms measured at 87 K were used for the first time in the DIS analysis.
Takeaway
When we swap certain chemicals in clay, it makes the clay have more tiny holes, which helps it hold onto gases better.
Methodology
The study used N2 and Ar physisorption isotherms at cryogenic temperatures to analyze the textural properties of clays.
Limitations
The exact positioning of the deconvoluted peaks representing contributions of adsorption sites remains uncertain.
Digital Object Identifier (DOI)
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