A new high density CO/oxygen coadsorbate layer on Pt(111) and its role in CO oxidation

K. L. Kostov; P. Jakoba; D. Menzel

doi:10.1016/S0039-6028(96)01508-7

A new high density CO/oxygen coadsorbate layer on Pt(111) and its role in CO oxidation

K. L. Kostov
, P. Jakoba
, D. Menzel

Chair of Experimental Physics

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

38 Scopus citations

Abstract

A high density CO/oxygen coadsorbate layer with maximal composition 2CO + O can be prepared by exposing the O(2 × 2)/Pt(111) layer to large CO doses (up to 10⁵ L). It has been studied by HREELS, TPD and LEED. At 120 K all CO molecules are adsorbed in linear form, irrespective of the coverage, showing another case of noncorrelation of adsorption site and internal CO stretch frequency. Heating to 260 K, i.e. in the range of incipient CO oxidation, leads to partial conversion of CO into two higher coordinated states with v(C-O) at 1750 and 1850 cm^-1. While only one well known CO oxidation channel between 330 and 360 K is observed for CO coverages below θ(CO) = 0.25 ML, a new CO oxidation channel at 290-300 K opens up for higher θ(CO).

Original language	English
Pages (from-to)	802-807
Number of pages	6
Journal	Surface Science
Volume	377-379
DOIs	https://doi.org/10.1016/S0039-6028(96)01508-7
State	Published - 20 Apr 1997

Keywords

Carbon monoxide
Electron energy loss spectroscopy
Low index single crystal surfaces
Oxygen
Platinum
Surface chemical reaction
Thermal desorption spectroscopy
Vibrations of adsorbed molecules

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10.1016/S0039-6028(96)01508-7

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@article{a3c3439b7e7e43ebbb9954dedfca88fc,

title = "A new high density CO/oxygen coadsorbate layer on Pt(111) and its role in CO oxidation",

abstract = "A high density CO/oxygen coadsorbate layer with maximal composition 2CO + O can be prepared by exposing the O(2 × 2)/Pt(111) layer to large CO doses (up to 105 L). It has been studied by HREELS, TPD and LEED. At 120 K all CO molecules are adsorbed in linear form, irrespective of the coverage, showing another case of noncorrelation of adsorption site and internal CO stretch frequency. Heating to 260 K, i.e. in the range of incipient CO oxidation, leads to partial conversion of CO into two higher coordinated states with v(C-O) at 1750 and 1850 cm-1. While only one well known CO oxidation channel between 330 and 360 K is observed for CO coverages below θ(CO) = 0.25 ML, a new CO oxidation channel at 290-300 K opens up for higher θ(CO).",

keywords = "Carbon monoxide, Electron energy loss spectroscopy, Low index single crystal surfaces, Oxygen, Platinum, Surface chemical reaction, Thermal desorption spectroscopy, Vibrations of adsorbed molecules",

author = "Kostov, \{K. L.\} and P. Jakoba and D. Menzel",

note = "Funding Information: Financial support by Deutsche Forschungs-gesellschaft through SFB 338 is gratefully acknowledged. K.L.K. also thanks the Ministry of Education and Science, Bulgaria (contract X-436) for financial support.",

year = "1997",

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day = "20",

doi = "10.1016/S0039-6028(96)01508-7",

language = "English",

volume = "377-379",

pages = "802--807",

journal = "Surface Science",

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TY - JOUR

T1 - A new high density CO/oxygen coadsorbate layer on Pt(111) and its role in CO oxidation

AU - Kostov, K. L.

AU - Jakoba, P.

AU - Menzel, D.

N1 - Funding Information: Financial support by Deutsche Forschungs-gesellschaft through SFB 338 is gratefully acknowledged. K.L.K. also thanks the Ministry of Education and Science, Bulgaria (contract X-436) for financial support.

PY - 1997/4/20

Y1 - 1997/4/20

N2 - A high density CO/oxygen coadsorbate layer with maximal composition 2CO + O can be prepared by exposing the O(2 × 2)/Pt(111) layer to large CO doses (up to 105 L). It has been studied by HREELS, TPD and LEED. At 120 K all CO molecules are adsorbed in linear form, irrespective of the coverage, showing another case of noncorrelation of adsorption site and internal CO stretch frequency. Heating to 260 K, i.e. in the range of incipient CO oxidation, leads to partial conversion of CO into two higher coordinated states with v(C-O) at 1750 and 1850 cm-1. While only one well known CO oxidation channel between 330 and 360 K is observed for CO coverages below θ(CO) = 0.25 ML, a new CO oxidation channel at 290-300 K opens up for higher θ(CO).

AB - A high density CO/oxygen coadsorbate layer with maximal composition 2CO + O can be prepared by exposing the O(2 × 2)/Pt(111) layer to large CO doses (up to 105 L). It has been studied by HREELS, TPD and LEED. At 120 K all CO molecules are adsorbed in linear form, irrespective of the coverage, showing another case of noncorrelation of adsorption site and internal CO stretch frequency. Heating to 260 K, i.e. in the range of incipient CO oxidation, leads to partial conversion of CO into two higher coordinated states with v(C-O) at 1750 and 1850 cm-1. While only one well known CO oxidation channel between 330 and 360 K is observed for CO coverages below θ(CO) = 0.25 ML, a new CO oxidation channel at 290-300 K opens up for higher θ(CO).

KW - Carbon monoxide

KW - Electron energy loss spectroscopy

KW - Low index single crystal surfaces

KW - Oxygen

KW - Platinum

KW - Surface chemical reaction

KW - Thermal desorption spectroscopy

KW - Vibrations of adsorbed molecules

UR - https://www.scopus.com/pages/publications/4944259881

U2 - 10.1016/S0039-6028(96)01508-7

DO - 10.1016/S0039-6028(96)01508-7

M3 - Article

AN - SCOPUS:4944259881

SN - 0039-6028

VL - 377-379

SP - 802

EP - 807

JO - Surface Science

JF - Surface Science

ER -

A new high density CO/oxygen coadsorbate layer on Pt(111) and its role in CO oxidation

Abstract

Keywords

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