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Title: FT-IR study of the surface properties of the spinels NiAl sub 2 O sub 4 and CoAl sub 2 O sub 4 in relation to those of transitional aluminas

Abstract

The surface chemistry of {delta}-Al{sub 2}O{sub 3}, NiAl{sub 2}O{sub 4}, and CoAl{sub 2}O{sub 4} has been investigated comparatively by FT-IR spectroscopy using adsorbed carbon monoxide and pyridine as probe molecules. The surface OHs of the inverse spinel NiAl{sub 2}O{sub 4} are different and resemble those of other normal spinels. Both carbon monoxide and pyridine adsorption provide evidence for the presence of tetrahedral Al{sup 3+} ions exposed on the surface of the inverse spinel NiAl{sub 2}O{sub 4}. On the normal spinel CoAl{sub 2}O{sub 4} octahedral Al{sup 3+} ions predominate with respect to the tetrahedral ones, also present because of partial inversion. Ni{sub 2+} and Co{sub 2+} ions are also detected on the respective surfaces. Slight modifications to the literature criteria are suggested for the assignments of the IR bands to surface OHs and of adsorbed pyridine on aluminas.

Authors:
; ; ;  [1]
  1. Univ. di Genova (Italy)
Publication Date:
OSTI Identifier:
5731245
Resource Type:
Journal Article
Journal Name:
Journal of Catalysis; (United States)
Additional Journal Information:
Journal Volume: 131:1; Journal ID: ISSN 0021-9517
Country of Publication:
United States
Language:
English
Subject:
37 INORGANIC, ORGANIC, PHYSICAL AND ANALYTICAL CHEMISTRY; ALUMINIUM OXIDES; SURFACE PROPERTIES; COBALT COMPOUNDS; NICKEL COMPOUNDS; SPINELS; ADSORPTION; ALUMINATES; CARBON MONOXIDE; CATALYSTS; FOURIER TRANSFORMATION; HETEROGENEOUS CATALYSIS; HYDROXYL RADICALS; INFRARED RADIATION; PYRIDINES; SPECTROSCOPY; ALUMINIUM COMPOUNDS; AZINES; CARBON COMPOUNDS; CARBON OXIDES; CATALYSIS; CHALCOGENIDES; ELECTROMAGNETIC RADIATION; HETEROCYCLIC COMPOUNDS; INTEGRAL TRANSFORMATIONS; MINERALS; ORGANIC COMPOUNDS; ORGANIC NITROGEN COMPOUNDS; OXIDE MINERALS; OXIDES; OXYGEN COMPOUNDS; RADIATIONS; RADICALS; SORPTION; TRANSFORMATIONS; TRANSITION ELEMENT COMPOUNDS; 400201* - Chemical & Physicochemical Properties

Citation Formats

Busca, G, Lorenzelli, V, Escribano, V S, and Guidetti, R. FT-IR study of the surface properties of the spinels NiAl sub 2 O sub 4 and CoAl sub 2 O sub 4 in relation to those of transitional aluminas. United States: N. p., 1991. Web. doi:10.1016/0021-9517(91)90333-Y.
Busca, G, Lorenzelli, V, Escribano, V S, & Guidetti, R. FT-IR study of the surface properties of the spinels NiAl sub 2 O sub 4 and CoAl sub 2 O sub 4 in relation to those of transitional aluminas. United States. doi:10.1016/0021-9517(91)90333-Y.
Busca, G, Lorenzelli, V, Escribano, V S, and Guidetti, R. Sun . "FT-IR study of the surface properties of the spinels NiAl sub 2 O sub 4 and CoAl sub 2 O sub 4 in relation to those of transitional aluminas". United States. doi:10.1016/0021-9517(91)90333-Y.
@article{osti_5731245,
title = {FT-IR study of the surface properties of the spinels NiAl sub 2 O sub 4 and CoAl sub 2 O sub 4 in relation to those of transitional aluminas},
author = {Busca, G and Lorenzelli, V and Escribano, V S and Guidetti, R},
abstractNote = {The surface chemistry of {delta}-Al{sub 2}O{sub 3}, NiAl{sub 2}O{sub 4}, and CoAl{sub 2}O{sub 4} has been investigated comparatively by FT-IR spectroscopy using adsorbed carbon monoxide and pyridine as probe molecules. The surface OHs of the inverse spinel NiAl{sub 2}O{sub 4} are different and resemble those of other normal spinels. Both carbon monoxide and pyridine adsorption provide evidence for the presence of tetrahedral Al{sup 3+} ions exposed on the surface of the inverse spinel NiAl{sub 2}O{sub 4}. On the normal spinel CoAl{sub 2}O{sub 4} octahedral Al{sup 3+} ions predominate with respect to the tetrahedral ones, also present because of partial inversion. Ni{sub 2+} and Co{sub 2+} ions are also detected on the respective surfaces. Slight modifications to the literature criteria are suggested for the assignments of the IR bands to surface OHs and of adsorbed pyridine on aluminas.},
doi = {10.1016/0021-9517(91)90333-Y},
journal = {Journal of Catalysis; (United States)},
issn = {0021-9517},
number = ,
volume = 131:1,
place = {United States},
year = {1991},
month = {9}
}