A fast XPS investigation of NO-promoted acetylene cyclotrimerisation on Pd{111}

Adam F. Lee, R. Mark Ormerod, Karen Wilson, Richard M. Lambert, Andrea Goldoni, Alessandro Baraldi

Research output: Contribution to journalArticlepeer-review


The strong promotion by NO of acetylene cyclotrimerisation to benzene on Pd{1 1 1} has been investigated by fast XPS, supported by LEED and Δφ data. Islands of NO act to compress co-existing islands of acetylene. The resulting increase in acetylene density dramatically lowers the nominal threshold acetylene coverage required for reaction. In addition, the threshold reaction temperature is reduced from 150 to <100 K, and increased lateral interactions within the organic domains promote formation of tilted benzene. Co-adsorption of NO with benzene itself accelerates the desorption of both tilted and flat-lying benzene at low temperatures. These factors act to increase the yield of reactively formed benzene to 100%, completely suppressing carbon deposition that would otherwise result from decomposition of reactant and product.

Original languageEnglish
Pages (from-to)L165–L170
Number of pages6
JournalSurface science
Issue number1-2
Early online date8 Jan 2002
Publication statusPublished - 20 Mar 2002


  • x-ray photoelectron spectroscopy
  • catalysis
  • surface chemical reaction
  • nitrogen oxides
  • alkynes


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