Journal
SCIENCE
Volume 335, Issue 6073, Pages 1209-1212Publisher
AMER ASSOC ADVANCEMENT SCIENCE
DOI: 10.1126/science.1215864
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Funding
- U.S. Department of Energy [FG02-10ER16170]
- NSF [CBET 0828666]
- Department of Education
- Tufts University
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Facile dissociation of reactants and weak binding of intermediates are key requirements for efficient and selective catalysis. However, these two variables are intimately linked in a way that does not generally allow the optimization of both properties simultaneously. By using desorption measurements in combination with high-resolution scanning tunneling microscopy, we show that individual, isolated Pd atoms in a Cu surface substantially lower the energy barrier to both hydrogen uptake on and subsequent desorption from the Cu metal surface. This facile hydrogen dissociation at Pd atom sites and weak binding to Cu allow for very selective hydrogenation of styrene and acetylene as compared with pure Cu or Pd metal alone.
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