Adsorption and reaction of methanethiol on Pt(1 1 1)

T. H. Lin; T. P. Huang; Y. L. Liu; C. C. Yeh; Y. H. Lai; W. H. Hung

doi:10.1016/j.susc.2004.12.029

Adsorption and reaction of methanethiol on Pt(1 1 1)

T. H. Lin, T. P. Huang, Y. L. Liu, C. C. Yeh, Y. H. Lai, W. H. Hung^*

^*Corresponding author for this work

Department of Chemistry

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

13 Citations (Scopus)

Abstract

Adsorption and thermal decomposition of H₃CSH on Pt(1 1 1) is studied with temperature-programmed desorption (TPD) and X-ray photoelectron spectroscopy (XPS) with synchrotron radiation. A H₃CSH molecule undergoes dehydrogenation via formation of H_xCS (x ≤ 3) intermediates. The catalytic reactivity of Pt for dehydrogenation, which depends on interaction between the surface and the CH_x moiety of H_xCS, varies with coverage. At large coverage, H₃CSH decomposes through desorbing hydrogen via stepwise dehydrogenation (H ₃CS → H₂CS → HCS → S + C). H₂CS is proposed to be an intermediate for dehydrogenation of H₃CS below 240 K, and subsequently undergoes disproportionation to form HCS with desorption of CH₄ at 400 K. The HCS species further decomposes to desorb hydrogen at 475 K and to form C and S adatoms; these adatoms show a mixed (3×3)R30° and dim c(2 × 2) LEED pattern at saturation exposure. At small coverage, surface Pt exhibits a catalytic effect on dehydrogenation of H_xCS via interaction of the CH_x moiety with surface Pt atoms. Dehydrogenation of H₃CSH is completed below 370 K and is proposed to form a surface CS species; this species entirely decomposes to form C and S adatoms at 570 K.

Original language	English
Pages (from-to)	27-34
Number of pages	8
Journal	Surface Science
Volume	578
Issue number	1-3
DOIs	https://doi.org/10.1016/j.susc.2004.12.029
Publication status	Published - 2005 Mar 10

Keywords

Dehydrogenation
Methanethiol
Pt
TPD
XPS

ASJC Scopus subject areas

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

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10.1016/j.susc.2004.12.029

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title = "Adsorption and reaction of methanethiol on Pt(1 1 1)",

abstract = "Adsorption and thermal decomposition of H3CSH on Pt(1 1 1) is studied with temperature-programmed desorption (TPD) and X-ray photoelectron spectroscopy (XPS) with synchrotron radiation. A H3CSH molecule undergoes dehydrogenation via formation of HxCS (x ≤ 3) intermediates. The catalytic reactivity of Pt for dehydrogenation, which depends on interaction between the surface and the CHx moiety of HxCS, varies with coverage. At large coverage, H3CSH decomposes through desorbing hydrogen via stepwise dehydrogenation (H 3CS → H2CS → HCS → S + C). H2CS is proposed to be an intermediate for dehydrogenation of H3CS below 240 K, and subsequently undergoes disproportionation to form HCS with desorption of CH4 at 400 K. The HCS species further decomposes to desorb hydrogen at 475 K and to form C and S adatoms; these adatoms show a mixed (3×3)R30° and dim c(2 × 2) LEED pattern at saturation exposure. At small coverage, surface Pt exhibits a catalytic effect on dehydrogenation of HxCS via interaction of the CHx moiety with surface Pt atoms. Dehydrogenation of H3CSH is completed below 370 K and is proposed to form a surface CS species; this species entirely decomposes to form C and S adatoms at 570 K.",

keywords = "Dehydrogenation, Methanethiol, Pt, TPD, XPS",

author = "Lin, {T. H.} and Huang, {T. P.} and Liu, {Y. L.} and Yeh, {C. C.} and Lai, {Y. H.} and Hung, {W. H.}",

note = "Funding Information: We thank for support NSRRC and National Science Council (grant no. NSC93-2113-M-003-012). ",

year = "2005",

month = mar,

day = "10",

doi = "10.1016/j.susc.2004.12.029",

language = "English",

volume = "578",

pages = "27--34",

journal = "Surface Science",

issn = "0039-6028",

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number = "1-3",

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TY - JOUR

T1 - Adsorption and reaction of methanethiol on Pt(1 1 1)

AU - Lin, T. H.

AU - Huang, T. P.

AU - Liu, Y. L.

AU - Yeh, C. C.

AU - Lai, Y. H.

AU - Hung, W. H.

N1 - Funding Information: We thank for support NSRRC and National Science Council (grant no. NSC93-2113-M-003-012).

PY - 2005/3/10

Y1 - 2005/3/10

N2 - Adsorption and thermal decomposition of H3CSH on Pt(1 1 1) is studied with temperature-programmed desorption (TPD) and X-ray photoelectron spectroscopy (XPS) with synchrotron radiation. A H3CSH molecule undergoes dehydrogenation via formation of HxCS (x ≤ 3) intermediates. The catalytic reactivity of Pt for dehydrogenation, which depends on interaction between the surface and the CHx moiety of HxCS, varies with coverage. At large coverage, H3CSH decomposes through desorbing hydrogen via stepwise dehydrogenation (H 3CS → H2CS → HCS → S + C). H2CS is proposed to be an intermediate for dehydrogenation of H3CS below 240 K, and subsequently undergoes disproportionation to form HCS with desorption of CH4 at 400 K. The HCS species further decomposes to desorb hydrogen at 475 K and to form C and S adatoms; these adatoms show a mixed (3×3)R30° and dim c(2 × 2) LEED pattern at saturation exposure. At small coverage, surface Pt exhibits a catalytic effect on dehydrogenation of HxCS via interaction of the CHx moiety with surface Pt atoms. Dehydrogenation of H3CSH is completed below 370 K and is proposed to form a surface CS species; this species entirely decomposes to form C and S adatoms at 570 K.

AB - Adsorption and thermal decomposition of H3CSH on Pt(1 1 1) is studied with temperature-programmed desorption (TPD) and X-ray photoelectron spectroscopy (XPS) with synchrotron radiation. A H3CSH molecule undergoes dehydrogenation via formation of HxCS (x ≤ 3) intermediates. The catalytic reactivity of Pt for dehydrogenation, which depends on interaction between the surface and the CHx moiety of HxCS, varies with coverage. At large coverage, H3CSH decomposes through desorbing hydrogen via stepwise dehydrogenation (H 3CS → H2CS → HCS → S + C). H2CS is proposed to be an intermediate for dehydrogenation of H3CS below 240 K, and subsequently undergoes disproportionation to form HCS with desorption of CH4 at 400 K. The HCS species further decomposes to desorb hydrogen at 475 K and to form C and S adatoms; these adatoms show a mixed (3×3)R30° and dim c(2 × 2) LEED pattern at saturation exposure. At small coverage, surface Pt exhibits a catalytic effect on dehydrogenation of HxCS via interaction of the CHx moiety with surface Pt atoms. Dehydrogenation of H3CSH is completed below 370 K and is proposed to form a surface CS species; this species entirely decomposes to form C and S adatoms at 570 K.

KW - Dehydrogenation

KW - Methanethiol

KW - Pt

KW - TPD

KW - XPS

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DO - 10.1016/j.susc.2004.12.029

M3 - Article

AN - SCOPUS:14044268705

SN - 0039-6028

VL - 578

SP - 27

EP - 34

JO - Surface Science

JF - Surface Science

IS - 1-3

ER -

Adsorption and reaction of methanethiol on Pt(1 1 1)

Abstract

Keywords

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