Abstract
A review of acetylene cyclotrimerization to form benzene is presented. This structure-sensitive catalytic reaction is of particular interest because C–C bonds can be formed readily on certain surfaces under ultra high vacuum (UHV) conditions. In addition, we present new results for acetylene cyclotrimerization on a bimetallic surface, Pd deposited on W(211). Pd on W is chosen because it is a morphologically unstable system and W(211) facets develop after annealing Pd/W(111) to ≥700 K. Temperature programmed desorption (TPD) data reveal negligible amounts of benzene detected from acetylene adsorption on clean W(211). A monolayer (ML) Pd film on W(211) decreases the high reactivity towards acetylene decomposition and catalyzes the cyclotrimerization reaction; benzene desorbs with TPD peaks at 210 K and ∼470 K. The use of high resolution electron energy loss spectroscopy (HREELS) has shown the desorption of benzene products to be reaction rate-limited on the ∼1.0 ML Pd/W(211) surface.
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