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A remarkable heavy atom isotope effect in the dissociative chemisorption of nitrogen on Ru,,001...
 

Summary: A remarkable heavy atom isotope effect in the dissociative chemisorption
of nitrogen on Ru,,001...
L. Romm, O. Citri, R. Kosloff, and M. Asschera)
Department of Physical Chemistry and The Fritz Haber and Farkas Research Centers,
The Hebrew University, Jerusalem 91904, Israel
Received 19 April 1999; accepted 22 March 2000
An extremely large isotope effect Ieff Pdiss(15
N2)/Pdiss(14
N2) , has been measured in the
dissociative chemisorption of nitrogen molecules over Ru 001 . It varies from unity at kinetic
energies above 2 eV to 0.2 at Ek 1.4 eV. These observations are consistent with a barrier for direct
dissociation of 1.8 eV, in agreement with previous experiments and recent ab initio density
functional theory calculations. It supports earlier studies that proposed tunneling as the dissociation
dynamics mechanism. 2000 American Institute of Physics. S0021-9606 00 71119-6
The rate-limiting step of the heterogeneous catalytic am-
monia synthesis from its elements is the dissociative chemi-
sorption of nitrogen on top of an iron-based catalyst.1,2
The
high NN bond energy of 9.78 eV excludes a direct thermal
dissociation process. The catalytic mechanism is therefore

  

Source: Asscher, Micha - Institute of Chemistry, Hebrew University of Jerusalem

 

Collections: Chemistry