Preparation and characterization of Cr- and Fe-pillared bentonites by using CrCl3, FeCl3, Cr(acaC)3 and Fe(acac)3 as precursors
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Tarih
2008
Dergi Başlığı
Dergi ISSN
Cilt Başlığı
Yayıncı
Elsevier
Erişim Hakkı
info:eu-repo/semantics/closedAccess
Özet
Four pillared bentonites (Cr-PILB, Cr(acaC)(3)-PILB, Fe-PILB and Fe(acaC)(3)-PILB were prepared and characterized by X-ray diffraction (XRD), nitrogen sorption measurements and thermogravimetric (TG) analysis. The surface acidities of the samples and their structures were also investigated in the gas phase adsorption data of pyridine by the aid of FT-IR spectroscopic techniques. The XRD data and FT-IR spectra of the samples reflected mainly the structure of bentonite. The nitrogen adsorption-desorption isotherms of the samples were Type II shaped and showed in general mesoporous structures with pore openings of 4 nm. Two steps mass losses were observed in the TGA thermograms of B, Cr-PILB and Fe-PILB, while three steps mass losses were detected in the case of Cr(acaC)(3)-PILB and Fe(acaC)(3)-PILB. IR study by the adsorption of pyridine on the samples showed both Lewis and Bronsted acid sites on their surfaces. (C) 2007 Elsevier Inc. All rights reserved.
Açıklama
Anahtar Kelimeler
Bentonite, Pillared Bentonite, Cr-Pillared Bentonite, Fe-Pillared Bentonite, Surface Acidity, Cr(Acac)(3), Fe(Acac)(3)
Kaynak
Microporous and Mesoporous Materials
WoS Q Değeri
Q1
Scopus Q Değeri
Q1
Cilt
111
Sayı
1-3
