eprintid: 3100
rev_number: 2
eprint_status: archive
userid: 1
dir: disk0/00/00/31/00
datestamp: 2023-11-09 15:51:21
lastmod: 2023-11-09 15:51:21
status_changed: 2023-11-09 15:44:59
type: article
metadata_visibility: show
creators_name: Farooq, M.
creators_name: Ramli, A.
creators_name: Subbarao, D.
title: Physiochemical properties of γ-Al 2O 3-MgO and γ-Al 2O 3-CeO 2 composite oxides
ispublished: pub
keywords: Brunauer-Emmett-Teller method; Chemical environment; Composite oxide; Field emission scanning; Oxidation state; Physio-chemical properties; Point of zero charge; Potentiometric methods; Salt addition; Valence state; Wet impregnation method; X ray fluorescence, Alumina; Binding energy; Cerium; Complexation; Field emission microscopes; Loading; Scanning electron microscopy; X ray diffraction; X ray diffraction analysis; X ray photoelectron spectroscopy, Aluminum
note: cited By 24
abstract: A series of γ-Al 2O 3-MgO and γ-Al 2O 3-CeO 2 composite oxides with different respective MgO and CeO 2 loadings were prepared successfully via wet impregnation method. The synthesized composite oxides were characterized by X-ray diffraction (XRD), field emission scanning electron microscopy-energy dispersive X-ray analysis (FESEM-EDAX), thermogravimeric analysis (TGA), X-ray photoelectron spectroscopy (XPS), X-ray fluorescence (XRF) and Brunauer-Emmett-Teller (BET) methods. The point of zero charge (PZC) of oxides/mixed oxides was determined by salt addition and potentiometric methods to explore the effects of MgO and CeO 2 contents on the PZC of γ-Al 2O 3. The results showed that, as the MgO loading was increased, PZC of alumina also increased linearly. However, in the case of CeO 2 addition, the change in PZC of γ-Al 2O 3 was not so significant. Moreover, the PZC of these synthesized composite oxides varied between the PZCs of pure oxides of Al 2O 3, MgO, and CeO 2. Further, it was noted that, at lower MgO and CeO 2 loadings, the structure of γ-Al 2O 3 was protected; however, at higher loadings, a change in the structure of γ-Al 2O 3 was observed. XPS results showed that binding energies decreased as MgO and CeO 2 loadings were increased. This decrease in the binding energies of Mg and Ce was attributed to the change in their chemical environment which caused change in the average valence state (oxidation state) of elements. © 2011 American Chemical Society.
date: 2012
official_url: https://www.scopus.com/inward/record.uri?eid=2-s2.0-84855884423&doi=10.1021%2fje200597h&partnerID=40&md5=25b2f3e171964effef320aa57573dfe8
id_number: 10.1021/je200597h
full_text_status: none
publication: Journal of Chemical and Engineering Data
volume: 57
number: 1
pagerange: 26-32
refereed: TRUE
issn: 00219568
citation:   Farooq, M. and Ramli, A. and Subbarao, D.  (2012) Physiochemical properties of γ-Al 2O 3-MgO and γ-Al 2O 3-CeO 2 composite oxides.  Journal of Chemical and Engineering Data, 57 (1).  pp. 26-32.  ISSN 00219568