The oxidation of small rhodium metal particles

A. David Logan; Ehrich J. Braunschweig; Abhaya K. Datye; David Smith

doi:10.1016/0304-3991(89)90043-0

The oxidation of small rhodium metal particles

A. David Logan, Ehrich J. Braunschweig, Abhaya K. Datye, David Smith

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37 Scopus citations

Abstract

The progressive oxidation of small Rh metal particles supported on model SiO₂ and TiO₂ supports has been quantified using high resolution electron microscopy (HREM) and volumetric oxygen uptake. Volumetric O₂ uptakes show that Rh particles, with diameters of 5-10 nm, oxidize faster when supported on TiO₂ than on SiO₂. HREM reveals the existence of a rhodium oxide phase with a lattice spacing of 0.29 nm that grows parallel to the Rh (111) planes on the silica-supported catalysts. The stoichiometry of the oxide formed at lower temperatures suggest that this intermediate phase may correspond to RhO. Oxidation at higher temperatures transforms the Rh oxide particles to polycrystalline Rh₂O₃.

Original language	English (US)
Pages (from-to)	132-137
Number of pages	6
Journal	Ultramicroscopy
Volume	31
Issue number	1
DOIs	https://doi.org/10.1016/0304-3991(89)90043-0
State	Published - Sep 1989

ASJC Scopus subject areas

Electronic, Optical and Magnetic Materials
Atomic and Molecular Physics, and Optics
Instrumentation

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10.1016/0304-3991(89)90043-0

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@article{6ae554723e9b4de88bb09eb259962b41,

title = "The oxidation of small rhodium metal particles",

abstract = "The progressive oxidation of small Rh metal particles supported on model SiO2 and TiO2 supports has been quantified using high resolution electron microscopy (HREM) and volumetric oxygen uptake. Volumetric O2 uptakes show that Rh particles, with diameters of 5-10 nm, oxidize faster when supported on TiO2 than on SiO2. HREM reveals the existence of a rhodium oxide phase with a lattice spacing of 0.29 nm that grows parallel to the Rh (111) planes on the silica-supported catalysts. The stoichiometry of the oxide formed at lower temperatures suggest that this intermediate phase may correspond to RhO. Oxidation at higher temperatures transforms the Rh oxide particles to polycrystalline Rh2O3.",

author = "{David Logan}, A. and Braunschweig, {Ehrich J.} and Datye, {Abhaya K.} and David Smith",

note = "Funding Information: This work was supportedb y the National Science Foundation (grant CBT-8707693)E.l ectron Microscopy was performed at the Microbeam Analysis Facility at the Departmento f Geology, University of New Mexico, and at the NSF National Facility for High Resolution Electron Mi-croscopyw ithin the Center for Solid StateS cience, Arizona State University (supported by grant DMR-86-11609).",

year = "1989",

month = sep,

doi = "10.1016/0304-3991(89)90043-0",

language = "English (US)",

volume = "31",

pages = "132--137",

journal = "Ultramicroscopy",

issn = "0304-3991",

publisher = "Elsevier",

number = "1",

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TY - JOUR

T1 - The oxidation of small rhodium metal particles

AU - David Logan, A.

AU - Braunschweig, Ehrich J.

AU - Datye, Abhaya K.

AU - Smith, David

N1 - Funding Information: This work was supportedb y the National Science Foundation (grant CBT-8707693)E.l ectron Microscopy was performed at the Microbeam Analysis Facility at the Departmento f Geology, University of New Mexico, and at the NSF National Facility for High Resolution Electron Mi-croscopyw ithin the Center for Solid StateS cience, Arizona State University (supported by grant DMR-86-11609).

PY - 1989/9

Y1 - 1989/9

N2 - The progressive oxidation of small Rh metal particles supported on model SiO2 and TiO2 supports has been quantified using high resolution electron microscopy (HREM) and volumetric oxygen uptake. Volumetric O2 uptakes show that Rh particles, with diameters of 5-10 nm, oxidize faster when supported on TiO2 than on SiO2. HREM reveals the existence of a rhodium oxide phase with a lattice spacing of 0.29 nm that grows parallel to the Rh (111) planes on the silica-supported catalysts. The stoichiometry of the oxide formed at lower temperatures suggest that this intermediate phase may correspond to RhO. Oxidation at higher temperatures transforms the Rh oxide particles to polycrystalline Rh2O3.

AB - The progressive oxidation of small Rh metal particles supported on model SiO2 and TiO2 supports has been quantified using high resolution electron microscopy (HREM) and volumetric oxygen uptake. Volumetric O2 uptakes show that Rh particles, with diameters of 5-10 nm, oxidize faster when supported on TiO2 than on SiO2. HREM reveals the existence of a rhodium oxide phase with a lattice spacing of 0.29 nm that grows parallel to the Rh (111) planes on the silica-supported catalysts. The stoichiometry of the oxide formed at lower temperatures suggest that this intermediate phase may correspond to RhO. Oxidation at higher temperatures transforms the Rh oxide particles to polycrystalline Rh2O3.

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DO - 10.1016/0304-3991(89)90043-0

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VL - 31

SP - 132

EP - 137

JO - Ultramicroscopy

JF - Ultramicroscopy

IS - 1

ER -

The oxidation of small rhodium metal particles

Abstract

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