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The Energy Dependence of the Ratio of Step and Terrace Reactivity for H 2 Dissociation on Stepped Platinum
Author(s) -
Groot Irene M. N.,
Kleyn Aart W.,
Juurlink Ludo B. F.
Publication year - 2011
Publication title -
angewandte chemie international edition
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 5.831
H-Index - 550
eISSN - 1521-3773
pISSN - 1433-7851
DOI - 10.1002/anie.201007093
Subject(s) - dissociation (chemistry) , platinum , nanoparticle , catalysis , platinum nanoparticles , bond dissociation energy , chemical physics , activation energy , materials science , molecule , chemistry , photochemistry , nanotechnology , organic chemistry
The fraction of dissociation processes f D for H 2 on platinum that take place on low‐coordinate sites of nanoparticles is strongly dependent on the gas temperature of the incoming molecules and on the diameter d of the nanoparticles (see picture). For high gas temperatures and large nanoparticles, dissociation occurs mostly on terraces. Therefore, assumptions that steps always dominate reaction in heterogeneous catalysis cannot be justified.