The adsorption of nitric oxide and nitrogen dioxide on polycrystalline platinum

D. T. Wickham; B. A. Banse; B. E. Koel

doi:10.1016/0039-6028(89)90727-9

The adsorption of nitric oxide and nitrogen dioxide on polycrystalline platinum

D. T. Wickham, B. A. Banse, B. E. Koel

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Abstract

NO and NO₂ adsorption on a polycrystalline platinum surface was studied using temperature programmed desorption (TPD). NO adsorption is irreversible for NO exposures of less than 0.12 L at 120 K yielding only N₂ and O₂ upon heating. However, when the NO exposure is increased to 0.12 L and above, reversible NO adsorption is observed. Two NO desorption states occur with peaks at 470 and 300 K. No desorption of NO₂ resulting from oxidation of NO was observed at any coverage. NO₂ adsorption at 120 K is largely irreversible below monolayer saturation coverages. However, a small NO₂ desorption peak is observed at 300 K at a monolayer coverage of NO₂. NO and O₂ TPD spectra following NO₂ exposures are quite different from those spectra obtained following NO or O₂ exposures. The differences in the NO TPD spectra are due to the influence of coadsorbed O atoms on the adsorption and decomposition of both NO and NO₂. Changes in the O₂ TPD spectra are due to the very high coverages of adsorbed O atoms that can be obtained from NO₂ exposures.

Original language	English (US)
Pages (from-to)	82-100
Number of pages	19
Journal	Surface Science
Volume	223
Issue number	1-2
DOIs	https://doi.org/10.1016/0039-6028(89)90727-9
State	Published - Dec 1 1989
Externally published	Yes

All Science Journal Classification (ASJC) codes

Condensed Matter Physics
Surfaces and Interfaces
Surfaces, Coatings and Films
Materials Chemistry

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10.1016/0039-6028(89)90727-9

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title = "The adsorption of nitric oxide and nitrogen dioxide on polycrystalline platinum",

abstract = "NO and NO2 adsorption on a polycrystalline platinum surface was studied using temperature programmed desorption (TPD). NO adsorption is irreversible for NO exposures of less than 0.12 L at 120 K yielding only N2 and O2 upon heating. However, when the NO exposure is increased to 0.12 L and above, reversible NO adsorption is observed. Two NO desorption states occur with peaks at 470 and 300 K. No desorption of NO2 resulting from oxidation of NO was observed at any coverage. NO2 adsorption at 120 K is largely irreversible below monolayer saturation coverages. However, a small NO2 desorption peak is observed at 300 K at a monolayer coverage of NO2. NO and O2 TPD spectra following NO2 exposures are quite different from those spectra obtained following NO or O2 exposures. The differences in the NO TPD spectra are due to the influence of coadsorbed O atoms on the adsorption and decomposition of both NO and NO2. Changes in the O2 TPD spectra are due to the very high coverages of adsorbed O atoms that can be obtained from NO2 exposures.",

author = "Wickham, {D. T.} and Banse, {B. A.} and Koel, {B. E.}",

note = "Funding Information: The authors wish to thank Dr. Mike Bartram for helpful and informative discussions regarding work with NO,. We would also like to thank Dr. Neil Avery for providing us with unpublished work concerning NO, adsorption on Pt(ll1) in the early stages of this work. Acknowledgment is made to the Donors of the Petroleum Research Fund, administered by the American Chemical Society, for partial support of this work. DTW also wishes to thank the Cooperative Institute for Research in Environmental Sciences (CIRES) for providing a Visiting Fellowship.",

year = "1989",

month = dec,

day = "1",

doi = "10.1016/0039-6028(89)90727-9",

language = "English (US)",

volume = "223",

pages = "82--100",

journal = "Surface Science",

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T1 - The adsorption of nitric oxide and nitrogen dioxide on polycrystalline platinum

AU - Wickham, D. T.

AU - Banse, B. A.

AU - Koel, B. E.

N1 - Funding Information: The authors wish to thank Dr. Mike Bartram for helpful and informative discussions regarding work with NO,. We would also like to thank Dr. Neil Avery for providing us with unpublished work concerning NO, adsorption on Pt(ll1) in the early stages of this work. Acknowledgment is made to the Donors of the Petroleum Research Fund, administered by the American Chemical Society, for partial support of this work. DTW also wishes to thank the Cooperative Institute for Research in Environmental Sciences (CIRES) for providing a Visiting Fellowship.

PY - 1989/12/1

Y1 - 1989/12/1

N2 - NO and NO2 adsorption on a polycrystalline platinum surface was studied using temperature programmed desorption (TPD). NO adsorption is irreversible for NO exposures of less than 0.12 L at 120 K yielding only N2 and O2 upon heating. However, when the NO exposure is increased to 0.12 L and above, reversible NO adsorption is observed. Two NO desorption states occur with peaks at 470 and 300 K. No desorption of NO2 resulting from oxidation of NO was observed at any coverage. NO2 adsorption at 120 K is largely irreversible below monolayer saturation coverages. However, a small NO2 desorption peak is observed at 300 K at a monolayer coverage of NO2. NO and O2 TPD spectra following NO2 exposures are quite different from those spectra obtained following NO or O2 exposures. The differences in the NO TPD spectra are due to the influence of coadsorbed O atoms on the adsorption and decomposition of both NO and NO2. Changes in the O2 TPD spectra are due to the very high coverages of adsorbed O atoms that can be obtained from NO2 exposures.

AB - NO and NO2 adsorption on a polycrystalline platinum surface was studied using temperature programmed desorption (TPD). NO adsorption is irreversible for NO exposures of less than 0.12 L at 120 K yielding only N2 and O2 upon heating. However, when the NO exposure is increased to 0.12 L and above, reversible NO adsorption is observed. Two NO desorption states occur with peaks at 470 and 300 K. No desorption of NO2 resulting from oxidation of NO was observed at any coverage. NO2 adsorption at 120 K is largely irreversible below monolayer saturation coverages. However, a small NO2 desorption peak is observed at 300 K at a monolayer coverage of NO2. NO and O2 TPD spectra following NO2 exposures are quite different from those spectra obtained following NO or O2 exposures. The differences in the NO TPD spectra are due to the influence of coadsorbed O atoms on the adsorption and decomposition of both NO and NO2. Changes in the O2 TPD spectra are due to the very high coverages of adsorbed O atoms that can be obtained from NO2 exposures.

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JO - Surface Science

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The adsorption of nitric oxide and nitrogen dioxide on polycrystalline platinum

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