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The kinetic study of H2S formation and desorption on the S/Pt(111) surface by computer simulation

Moshfegh, A. Z ; Sharif University of Technology | 2003

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  1. Type of Document: Article
  2. DOI: 10.1142/S0218625X03005542
  3. Publisher: 2003
  4. Abstract:
  5. In this investigation, we have studied the kinetics and mechanism of formation and desorption of H2S on the Pt(111) surface using a kinetic random walk model. The effect of temperature on the H2S formation was studied in the range of 85-150 K. It was observed that a maximum amount of H2S is formed at 90 K and the amount is reduced at higher temperatures. H2S production yield as a function of time at different initial sulfur coverage ranging from 0.02 to 0.33 ML (1 ML ≃ 1 x 1015 atoms/cm2) was also examined. It was obvious that as the initial S coverage increases, the rate of H2S formation rapidly increases and reaches a maximum value and then declines gradually. Furthermore, according to our simulated TPD spectra, for β = 1 K/s the maximum desorption rate occurs at Tp = 107.2 K. In addition, analysis of simulated TPD spectra of H2S desorption showed in an activation energy of H2S desorption Ed = 27.2 kcal/mol. Finally, the obtained simulated results were compared with the experimental data reported very recently, showing excellent agreement
  6. Keywords:
  7. Desorption ; H2S formation ; Kinetics ; Simulation ; TPD
  8. Source: Surface Review and Letters ; Volume 10, Issue 5 , 2003 , Pages 745-750 ; 0218625X (ISSN)
  9. URL: https://www.sciencedirect.com/science/article/abs/pii/S0040403903017775