Preparation, characterization and surface acid catalytic activity of microporous clays pillared with Al1-xFexOy (x=0.00 to 1.00) oxidic species
| dc.contributor.author | Stathopoulos, V. N. | en |
| dc.contributor.author | Ladavos, A. K. | en |
| dc.contributor.author | Kolonia, K. M. | en |
| dc.contributor.author | Skaribas, S. P. | en |
| dc.contributor.author | Petrakis, D. E. | en |
| dc.contributor.author | Pomonis, P. J. | en |
| dc.date.accessioned | 2015-11-24T16:45:28Z | |
| dc.date.available | 2015-11-24T16:45:28Z | |
| dc.identifier.issn | 1387-1811 | - |
| dc.identifier.uri | https://olympias.lib.uoi.gr/jspui/handle/123456789/8936 | |
| dc.rights | Default Licence | - |
| dc.subject | acid catalysis | en |
| dc.subject | acidity | en |
| dc.subject | clays | en |
| dc.subject | microporous | en |
| dc.subject | pillared | en |
| dc.subject | montmorillonite | en |
| dc.subject | smectites | en |
| dc.subject | complexes | en |
| dc.title | Preparation, characterization and surface acid catalytic activity of microporous clays pillared with Al1-xFexOy (x=0.00 to 1.00) oxidic species | en |
| heal.abstract | Montmorillonite was pillared with mixed oxidic species of the form Al1-xFexOy where x = 0.00, 0.05, 0.15, 0.25, 0.50, 0.75 and 100. The pillaring agent was an alkaline solution of the corresponding quantities of metal nitrates so as to obtain a final ratio (Al + Fe)/OH = 1:2. The specific surface area (BET) of the samples dried at 500 degrees C was found to be 230 +/- 10 m(2) g(-1) for x = 0.00 - 0.50 and similar to 139 +/- 8 m(2) g(-1) for x = 0.75-1.00. The XRD results obtained at low angles from samples oriented along the (001) axis showed gallery heights of the heated solids of 16-17 Angstrom for x = 0.00 - 0.50 and 9.9 - 9.8 Angstrom for x = 0.75 - 1.00. The acidity of the samples, checked by TPD of NH3, varied from similar to 12 x 10(17) sites m(-2) (x greater than or equal to 0.25) to similar to 9 x 10(17) sites m(-2) (x less than or equal to 0.75). The acid catalytic activity of the solids was checked using the isopropanol (IPA) decomposition as a probe reaction. The main products observed were propene (selectivity greater than or equal to 80%) and di-iso-propyl ether (DIPE) (selectivity less than or equal to 20%). The apparent activation energies for the TPA conversion were calculated, and the selectivity dependence on temperature was kinetically modelled. From this, a mechanism was derived to account for the reactions of one or two IPA molecules towards propene or DIPE, respectively, and the dependence of the selectivity on the Al/Fe ratio and the acidity of the solids. (C) 1999 Elsevier Science B.V. All rights reserved. | en |
| heal.access | campus | - |
| heal.fullTextAvailability | TRUE | - |
| heal.identifier.secondary | <Go to ISI>://000082838400010 | - |
| heal.identifier.secondary | http://ac.els-cdn.com/S138718119900061X/1-s2.0-S138718119900061X-main.pdf?_tid=0477f165fd0514ee0bb7ca141a6b98e7&acdnat=1333035680_9cd23dc2bce74bbc434374513f1a0ba0 | - |
| heal.journalName | Microporous and Mesoporous Materials | en |
| heal.journalType | peer reviewed | - |
| heal.language | en | - |
| heal.publicationDate | 1999 | - |
| 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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