Oxygen on iron oxide: Kinetic evidence of an atomic species

B. L. Yang; H. H. Kung

doi:10.1016/0021-9517(82)90215-9

Oxygen on iron oxide: Kinetic evidence of an atomic species

B. L. Yang, H. H. Kung^*

^*Corresponding author for this work

Chemical and Biological Engineering

Research output: Contribution to journal › Article › peer-review

19 Scopus citations

Abstract

Oxygen adsorbed on α-Fe₂O₃ in three different forms over the temperature range from 450 °C to room temperature. The form that adsorbed and desorbed between 200 and 300 °C desorbed with a second-order kinetics which suggested its atomic nature. The activation energy of desorption was found to be 163 ± 8 kJ/mole, and the initial coverage at 240 °C was 1.4 × 10¹⁶ molecules/m². It was postulated that the adsorption and desorption of this species involved pairs of surface iron ions containing coordinative unsaturation, while surface mobility of the species was provided by single surface iron ions.

Original language	English (US)
Pages (from-to)	329-336
Number of pages	8
Journal	Journal of Catalysis
Volume	75
Issue number	2
DOIs	https://doi.org/10.1016/0021-9517(82)90215-9
State	Published - Jun 1982

Funding

This work was supported by the U.S. Department of Energy, Basic Energy Sciences Division.

ASJC Scopus subject areas

Catalysis
Physical and Theoretical Chemistry

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10.1016/0021-9517(82)90215-9

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title = "Oxygen on iron oxide: Kinetic evidence of an atomic species",

abstract = "Oxygen adsorbed on α-Fe2O3 in three different forms over the temperature range from 450 °C to room temperature. The form that adsorbed and desorbed between 200 and 300 °C desorbed with a second-order kinetics which suggested its atomic nature. The activation energy of desorption was found to be 163 ± 8 kJ/mole, and the initial coverage at 240 °C was 1.4 × 1016 molecules/m2. It was postulated that the adsorption and desorption of this species involved pairs of surface iron ions containing coordinative unsaturation, while surface mobility of the species was provided by single surface iron ions.",

author = "Yang, {B. L.} and Kung, {H. H.}",

note = "Funding Information: This work was supported by the U.S. Department of Energy, Basic Energy Sciences Division.",

year = "1982",

month = jun,

doi = "10.1016/0021-9517(82)90215-9",

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journal = "Journal of Catalysis",

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T1 - Oxygen on iron oxide

T2 - Kinetic evidence of an atomic species

AU - Yang, B. L.

AU - Kung, H. H.

N1 - Funding Information: This work was supported by the U.S. Department of Energy, Basic Energy Sciences Division.

PY - 1982/6

Y1 - 1982/6

N2 - Oxygen adsorbed on α-Fe2O3 in three different forms over the temperature range from 450 °C to room temperature. The form that adsorbed and desorbed between 200 and 300 °C desorbed with a second-order kinetics which suggested its atomic nature. The activation energy of desorption was found to be 163 ± 8 kJ/mole, and the initial coverage at 240 °C was 1.4 × 1016 molecules/m2. It was postulated that the adsorption and desorption of this species involved pairs of surface iron ions containing coordinative unsaturation, while surface mobility of the species was provided by single surface iron ions.

AB - Oxygen adsorbed on α-Fe2O3 in three different forms over the temperature range from 450 °C to room temperature. The form that adsorbed and desorbed between 200 and 300 °C desorbed with a second-order kinetics which suggested its atomic nature. The activation energy of desorption was found to be 163 ± 8 kJ/mole, and the initial coverage at 240 °C was 1.4 × 1016 molecules/m2. It was postulated that the adsorption and desorption of this species involved pairs of surface iron ions containing coordinative unsaturation, while surface mobility of the species was provided by single surface iron ions.

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Oxygen on iron oxide: Kinetic evidence of an atomic species

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