Assessment of Porosities of SBA-15 and MCM-41 Using Water Sorption Calorimetry.
(2011) In Langmuir 27(7). p.3889-3897- Abstract
- Water sorption calorimetry has been used for characterization of 2D hexagonally ordered mesoporous silica SBA-15. Experimental data on water sorption isotherm, the enthalpy, and the entropy of hydration of SBA-15 are presented. The results were compared with previously published results on MCM-41 obtained using the same technique. The water sorption isotherm of SBA-15 consists of four regimes, while the sorption isotherm of MCM-41 consists only of three. The extra regime in the water sorption isotherm for SBA-15 arises from filling of intrawall pores, that are present in SBA-15 but absent in MCM-41. The water sorption isotherms of the two types of mesoporous silica were analyzed using the Barrett-Joyner-Halenda approach. For the BJH... (More)
- Water sorption calorimetry has been used for characterization of 2D hexagonally ordered mesoporous silica SBA-15. Experimental data on water sorption isotherm, the enthalpy, and the entropy of hydration of SBA-15 are presented. The results were compared with previously published results on MCM-41 obtained using the same technique. The water sorption isotherm of SBA-15 consists of four regimes, while the sorption isotherm of MCM-41 consists only of three. The extra regime in the water sorption isotherm for SBA-15 arises from filling of intrawall pores, that are present in SBA-15 but absent in MCM-41. The water sorption isotherms of the two types of mesoporous silica were analyzed using the Barrett-Joyner-Halenda approach. For the BJH analysis, t-curves of silica with different degrees of hydroxylation were proposed. Comparison of water and nitrogen t-curves shows that, independent of hydroxylation of silica surface, the adsorbed film of water is much thinner than the adsorbed film of nitrogen at similar relative pressures. This fact decreases the uncertainty of the assessment of porosity with water sorption originated from variations in surface properties. The pore size distribution of SBA-15 calculated with BJH treatment of water sorption data is in good agreement with nitrogen NLDFT results on the same material. (Less)
Please use this url to cite or link to this publication:
https://lup.lub.lu.se/record/1884451
- author
- Kocherbitov, Vitaly LU and Alfredsson, Viveka LU
- organization
- publishing date
- 2011
- type
- Contribution to journal
- publication status
- published
- subject
- in
- Langmuir
- volume
- 27
- issue
- 7
- pages
- 3889 - 3897
- publisher
- The American Chemical Society (ACS)
- external identifiers
-
- wos:000288970900087
- pmid:21366316
- scopus:79953244223
- ISSN
- 0743-7463
- DOI
- 10.1021/la103807v
- language
- English
- LU publication?
- yes
- id
- 71b5e8c0-1fee-441b-8c3a-91c9adbd1d20 (old id 1884451)
- date added to LUP
- 2016-04-01 10:27:11
- date last changed
- 2022-03-04 19:41:52
@article{71b5e8c0-1fee-441b-8c3a-91c9adbd1d20,
abstract = {{Water sorption calorimetry has been used for characterization of 2D hexagonally ordered mesoporous silica SBA-15. Experimental data on water sorption isotherm, the enthalpy, and the entropy of hydration of SBA-15 are presented. The results were compared with previously published results on MCM-41 obtained using the same technique. The water sorption isotherm of SBA-15 consists of four regimes, while the sorption isotherm of MCM-41 consists only of three. The extra regime in the water sorption isotherm for SBA-15 arises from filling of intrawall pores, that are present in SBA-15 but absent in MCM-41. The water sorption isotherms of the two types of mesoporous silica were analyzed using the Barrett-Joyner-Halenda approach. For the BJH analysis, t-curves of silica with different degrees of hydroxylation were proposed. Comparison of water and nitrogen t-curves shows that, independent of hydroxylation of silica surface, the adsorbed film of water is much thinner than the adsorbed film of nitrogen at similar relative pressures. This fact decreases the uncertainty of the assessment of porosity with water sorption originated from variations in surface properties. The pore size distribution of SBA-15 calculated with BJH treatment of water sorption data is in good agreement with nitrogen NLDFT results on the same material.}},
author = {{Kocherbitov, Vitaly and Alfredsson, Viveka}},
issn = {{0743-7463}},
language = {{eng}},
number = {{7}},
pages = {{3889--3897}},
publisher = {{The American Chemical Society (ACS)}},
series = {{Langmuir}},
title = {{Assessment of Porosities of SBA-15 and MCM-41 Using Water Sorption Calorimetry.}},
url = {{http://dx.doi.org/10.1021/la103807v}},
doi = {{10.1021/la103807v}},
volume = {{27}},
year = {{2011}},
}