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Capillary Critical Point of Argon, Nitrogen, Oxygen, Ethylene, and Carbon Dioxide in MCM-41
Abstract
The effect of temperature on adsorption isotherms of Ar, N 2, O 2, C 2 H 4, and CO 2 on mesoporous MCM-41 molecular sieves with different pore sizes (pore radius r p = 1.2, 1.4, 1.8, 2.1 nm) has been measured. The occurrence of adsorption hysteresis upon capillary condensation of these molecules in mesopores depends on their capillary critical temperatures ( T cc ), which are far below the corresponding bulk critical temperatures ( T c ). In accord with theoretical predictions of confined geometry effects on the criticality of fluids in narrow pores, a plot of ( T c − T cc )/ T c against d / r p for Ar, N 2, O 2, and C 2 H 4 seems to form a single straight line passing through the origin, where d is the molecular diameter. The data for CO 2 deviates from this relationship. These results are compared with critical point shifts of fluids in conventional mesoporous adsorbents with an interconnected network of pores available in the literature.
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Citations
Cited by
Inclusion Chemistry in Periodic Mesoporous Hosts
Moller, K., & Bein, T. (1998) · Chemistry of Materials · doi:10.1021/cm980243e · Cited by 916
Molecular simulation of water confined in nanoporous silica
Bonnaud, P. A., Coasne, B., & Pellenq, R. J.-M. (2010) · Journal of Physics: Condensed Matter · doi:10.1088/0953-8984/22/28/284110 · Cited by 182
Metadata
- Authors
- Morishige, K., Fujii, H., Uga, M., & Kinukawa, D.
- Venue
- Langmuir
- Publisher
- American Chemical Society (ACS)
- Published
- 1997-06-01
- Volume
- 13
- Issue
- 13
- Pages
- 3494-3498
- ISSN
- 0743-7463 (ISSN-L)
- 1520-5827
- OpenAlex
- W2019342866
- Cited by
- 250
- References
- 0
- FWCI
- 5.59
- Type
- journal article
- Language
- en
- Open access
- closed
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- Morishige, K., Fujii, H., Uga, M., & Kinukawa, D. (1997). Capillary Critical Point of Argon, Nitrogen, Oxygen, Ethylene, and Carbon Dioxide in MCM-41. Langmuir. https://doi.org/10.1021/la970079u
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