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*


研究成果: 雜誌貢獻期刊論文同行評審

13 引文 斯高帕斯(Scopus)


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.

頁(從 - 到)27-34
期刊Surface Science
出版狀態已發佈 - 2005 3月 10

ASJC Scopus subject areas

  • 凝聚態物理學
  • 表面和介面
  • 表面、塗料和薄膜
  • 材料化學


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