The possible use of Gamma-functions for the determination of microporosity-mesoporosity and the pore size in materials with ordered (MCM) and quasi-ordered pore structure
| dc.contributor.author | Armatas, G. S. | en |
| dc.contributor.author | Pomonis, P. J. | en |
| dc.date.accessioned | 2015-11-24T16:51:00Z | |
| dc.date.available | 2015-11-24T16:51:00Z | |
| dc.identifier.issn | 1387-1811 | - |
| dc.identifier.uri | https://olympias.lib.uoi.gr/jspui/handle/123456789/9671 | |
| dc.rights | Default Licence | - |
| dc.subject | porous solids | en |
| dc.subject | mcm | en |
| dc.subject | gamma-functions | en |
| dc.subject | pore size distribution | en |
| dc.subject | microporosity | en |
| dc.subject | mesoporosity | en |
| dc.subject | horvath-kawazoe equations | en |
| dc.subject | molecular-sieves | en |
| dc.subject | gas-adsorption | en |
| dc.subject | new-model | en |
| dc.subject | solids | en |
| dc.subject | hysteresis | en |
| dc.subject | nitrogen | en |
| dc.subject | surface | en |
| dc.subject | heterogeneity | en |
| dc.subject | prediction | en |
| dc.title | The possible use of Gamma-functions for the determination of microporosity-mesoporosity and the pore size in materials with ordered (MCM) and quasi-ordered pore structure | en |
| heal.abstract | The purpose of this work is to examine the possibility to apply Gamma-functions for the description of pore size distribution (PSD) as well as for the distinction between the microporosity and mesoporosity in materials with ordered and/or quasi-ordered pore structure. The group of materials used were six (6) MCM-Al-x solids (x = 0, 5, 10, 15, 20, 50) in which the ordered mesoporosity (x = 0) was gradually destroyed by increasing the percentage substitution x of Si by Al. All samples were characterized by N-2 adsorption-desorption porosimetry. Then the estimation of PSD took place by using two Gamma-functions, one for the micropore region (0 < D-P < 2 nm) and another for the mesopore region (2 < D-p < 50 nm). As a benchmark for the choice of Gamma-functions their fitting to the N-2-adsorption loop was used. Consequently the PSD from those chosen Gamma-functions was calculated and the results were compared with the method of Horvath-Kawazoe (HK). The specific surface areas S-p, the specific pore volumes V-p and the maximum D-P of the PSDs calculated by the standard methodologies (HK and BET) are perfectly compared to the ones obtained with the methodology of Gamma-functions. In addition the use of Gamma-functions methodology provides the possibility to distinguish the percentage of microporosity in such quasi-ordered, amorphous mesoporous, or quasi-mesoporous, materials which is zero for the pure siliceous MCM-Al-0 but increases gradually with the addition of Al atoms and reaches similar to32% for the highly substituted solids MCM-Al-50. (C) 2003 Elsevier Inc. All rights reserved. | en |
| heal.access | campus | - |
| heal.fullTextAvailability | TRUE | - |
| heal.identifier.primary | DOI 10.1016/j.micromeso.2003.09.028 | - |
| heal.identifier.secondary | <Go to ISI>://000188643100007 | - |
| heal.identifier.secondary | http://ac.els-cdn.com/S138718110300636X/1-s2.0-S138718110300636X-main.pdf?_tid=3a530007c67ed2ed0d68296470622f0c&acdnat=1333036157_b56946c4d95142e4b49690eca998c324 | - |
| heal.journalName | Microporous and Mesoporous Materials | en |
| heal.journalType | peer reviewed | - |
| heal.language | en | - |
| heal.publicationDate | 2004 | - |
| heal.publisher | Elsevier | en |
| heal.recordProvider | Πανεπιστήμιο Ιωαννίνων. Σχολή Θετικών Επιστημών. Τμήμα Χημείας | el |
| heal.type | journalArticle | - |
| heal.type.el | Άρθρο Περιοδικού | el |
| heal.type.en | Journal article | en |
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