Surface sites on spinel-type and corundum-type metal oxide powders

doi:https://doi.org/10.1021/la00030a012

Title: Surface sites on spinel-type and corundum-type metal oxide powders

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Abstract

The surface sites on isostructural metal oxides containing Al{sup 3+}, Fe{sup 3+}, and Cr{sup 3+} have been investigated by IR spectroscopy. The IR spectra of surface hydroxy groups and of pyridine coordinated on Lewis acidic surface cationic sites on the defective spinel-type sesquioxides {gamma}-Al{sub 2}O{sub 3}, {theta}-Al{sub 2}O{sub 3}, and {gamma}-Fe{sub 2}O{sub 3}, on the spinels MgAl{sub 2}O{sub 4}, MgFe{sub 2}O{sub 4}, MgCr{sub 2}O{sub 4}, ZnAl{sub 2}O{sub 4}, ZnFe{sub 2}O{sub 4}, and ZnCr{sub 2}O{sub 4}, as well as on the corundum-type sesquioxides {alpha}-Al{sub 2}O{sub 3}, {alpha}-Fe{sub 2}O{sub 3}, and {alpha}-Cr{sub 2}O{sub 3}, have been compared. Some Co{sup 2+} and Ni{sup 2+} spinel-type compounds have also been considered. An extension of the criteria previously proposed for the identification of the surface sites on aluminum-based materials to ferrites and chromites is suggested. The OH stretchings of surface hydroxy groups are indicative of the nature and the coordination of the cations to which they are bonded. Pyridine species bonded to tetrahedrally- and octahedrally-coordinated trivalent cations are well distinguishable on aluminates, while the distiction is more difficult for ferrites. 41 refs., 9 figs., 3 tabs.

Authors:

Busca, G; Lorenzelli, V; Ramis, G ^[1]; Willey, R J ^[2]

Universita de Genova (Italy)
Northeastern Univ., Boston, MA (United States)

Publication Date:: 1993-06-01

Sponsoring Org.:: USDOE

OSTI Identifier:: 603044

Resource Type:: Journal Article

Journal Name:: Langmuir

Additional Journal Information:: Journal Volume: 9; Journal Issue: 6; Other Information: PBD: Jun 1993

Country of Publication:: United States

Language:: English

Subject:: 36 MATERIALS SCIENCE; SURFACE PROPERTIES; ALUMINIUM OXIDES; IRON OXIDES; CHROMIUM OXIDES; INFRARED SPECTRA; POWDERS; PYRIDINE; SPINELS; BOND LENGTHS

Citation Formats


                    Busca, G, Lorenzelli, V, Ramis, G, Northeastern Univ., Boston, MA, and Willey, R J. Surface sites on spinel-type and corundum-type metal oxide powders.  United States: N. p., 1993. 
        Web.  doi:10.1021/la00030a012.

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                    Busca, G, Lorenzelli, V, Ramis, G, Northeastern Univ., Boston, MA, & Willey, R J. Surface sites on spinel-type and corundum-type metal oxide powders.  United States.  https://doi.org/10.1021/la00030a012

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                    Busca, G, Lorenzelli, V, Ramis, G, Northeastern Univ., Boston, MA, and Willey, R J. Tue .  
        "Surface sites on spinel-type and corundum-type metal oxide powders".  United States.  https://doi.org/10.1021/la00030a012.

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@article{osti_603044,

  title        = {Surface sites on spinel-type and corundum-type metal oxide powders},

  author       = {Busca, G and Lorenzelli, V and Ramis, G and Northeastern Univ., Boston, MA and Willey, R J},

  abstractNote = {The surface sites on isostructural metal oxides containing Al{sup 3+}, Fe{sup 3+}, and Cr{sup 3+} have been investigated by IR spectroscopy. The IR spectra of surface hydroxy groups and of pyridine coordinated on Lewis acidic surface cationic sites on the defective spinel-type sesquioxides {gamma}-Al{sub 2}O{sub 3}, {theta}-Al{sub 2}O{sub 3}, and {gamma}-Fe{sub 2}O{sub 3}, on the spinels MgAl{sub 2}O{sub 4}, MgFe{sub 2}O{sub 4}, MgCr{sub 2}O{sub 4}, ZnAl{sub 2}O{sub 4}, ZnFe{sub 2}O{sub 4}, and ZnCr{sub 2}O{sub 4}, as well as on the corundum-type sesquioxides {alpha}-Al{sub 2}O{sub 3}, {alpha}-Fe{sub 2}O{sub 3}, and {alpha}-Cr{sub 2}O{sub 3}, have been compared. Some Co{sup 2+} and Ni{sup 2+} spinel-type compounds have also been considered. An extension of the criteria previously proposed for the identification of the surface sites on aluminum-based materials to ferrites and chromites is suggested. The OH stretchings of surface hydroxy groups are indicative of the nature and the coordination of the cations to which they are bonded. Pyridine species bonded to tetrahedrally- and octahedrally-coordinated trivalent cations are well distinguishable on aluminates, while the distiction is more difficult for ferrites. 41 refs., 9 figs., 3 tabs.},

  doi          = {10.1021/la00030a012},

  url          = {https://www.osti.gov/biblio/603044},
  journal      = {Langmuir},
number       = 6,

  volume       = 9,

  place        = {United States},

  year         = {1993},

  month        = {6}

}

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