Controlled Architecture of Solids with Micro-Porosity and Meso-Porosity Obtained by Pillaring of Montmorillonite with an Laniox Binary Oxide
Φόρτωση...
Ημερομηνία
Συγγραφείς
Skaribas, S. P.
Pomonis, P. J.
Grange, P.
Delmon, B.
Τίτλος Εφημερίδας
Περιοδικό ISSN
Τίτλος τόμου
Εκδότης
The Royal Society of Chemistry
Περίληψη
Τύπος
Είδος δημοσίευσης σε συνέδριο
Είδος περιοδικού
peer reviewed
Είδος εκπαιδευτικού υλικού
Όνομα συνεδρίου
Όνομα περιοδικού
Journal of the Chemical Society-Faraday Transactions
Όνομα βιβλίου
Σειρά βιβλίου
Έκδοση βιβλίου
Συμπληρωματικός/δευτερεύων τίτλος
Περιγραφή
High-surface-area solids containing both micropores and mesopores have been synthesized by intercalation of the heterobinuclear cation of the complex NiLa(fsaen)NO3 between the layers of montmorillonite clay and calcination at 500-degrees-C. The adsorption mechanism of the complex follows an exchange reaction involving up to 2 mmol of complex cations per g of clay. Further amounts of complex are adsorbed in sites other than exchange ones as shown by zeta-potential experiments. The IR spectra of the intercalated complex showed no major alterations of the complex during adsorption and a stabilization effect and enhancement of the parallel orientation of the clay plates. X-Ray diffraction (XRD) measurements at low angles showed that the pillared clay possesses an interlayer distance of 13.4 angstrom at 500-degrees-C. Its BET surface area reaches a maximum of 220 m2 g-1 at this temperature. The a(s) plots showed a maximum microporosity at less-than-or-equal-to 2 mmol g-1 Additional loading results in transformation to a mesoporous delaminated structure. X-Ray photoelectron spectra (XPS) of the composite materials showed that the ratios La/Si and Ni/Si are lower than those determined by chemical analysis, owing to the shielded environment of the LaNiO(x) pillars in the clay. The same method indicated that for a high degree of loading the aggregates seem to be of perovskite origin.
Περιγραφή
Λέξεις-κλειδιά
binuclear metal-complexes, smectite clay catalysts, chemical-reactions, crystal-structure, delaminated clay, polyoxo cations, aluminum, n,n'-bis(3-carboxysalicylidene)ethylenediamine, surface
Θεματική κατηγορία
Παραπομπή
Σύνδεσμος
<Go to ISI>://A1992JX92300016
http://pubs.rsc.org/en/Content/ArticleLanding/1992/FT/ft9928803217
http://pubs.rsc.org/en/Content/ArticleLanding/1992/FT/ft9928803217
Γλώσσα
en
Εκδίδον τμήμα/τομέας
Όνομα επιβλέποντος
Εξεταστική επιτροπή
Γενική Περιγραφή / Σχόλια
Ίδρυμα και Σχολή/Τμήμα του υποβάλλοντος
Πανεπιστήμιο Ιωαννίνων. Σχολή Θετικών Επιστημών. Τμήμα Χημείας