AVS 60th International Symposium and Exhibition
    Applied Surface Science Thursday Sessions
       Session AS+BI+EM+NL+NS+SS-ThA

Paper AS+BI+EM+NL+NS+SS-ThA3
Structure-dependent Trends in Adsorption of CO, O2, and H2 on Pd and Pt Nanoparticle Catalysts

Thursday, October 31, 2013, 2:40 pm, Room 204

Session: Nanoparticle Surface Chemistry II
Presenter: H. Mistry, University of Central Florida
Authors: H. Mistry, University of Central Florida
F. Behafarid, University of Central Florida
B. Roldan Cuenya, University of Central Florida
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Many important catalytic reactions have shown striking dependence on particle size and shape. Therefore, understanding structure-dependent adsorption processes using model nanoparticles is key to designing highly active and selective catalysts. Temperature-programmed desorption and x-ray absorption fine structure spectroscopy were used to study the interaction of adsorbates with Pt and Pd nanocatalyts. The binding strength of oxygen and carbon monoxide adsorbed on Pd nanoparticles supported on SiO2/Si(111) was shown to increase with decreasing particle size. In addition, pressure-dependent changes in hydrogen coverage and structure of size- and shape- selected Pt/γ-Al2O3 nanoparticles were investigated.