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Interaction of N2 with Re(1120) in the presence of H2

✍ Scribed by G. Haase; M. Asscher

Publisher
Elsevier Science
Year
1987
Tongue
English
Weight
438 KB
Volume
142
Category
Article
ISSN
0009-2614

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✦ Synopsis

The effect of coadsorbed hydrogen on the molecular physisorption and dissociation of N2 on Re( 1120) was studied under UHV conditions. It was found that hydrogen blocks selectively the less tightly bound molecular physisorption site, a,. This blocking has no effect on the dissociation of NZ on this surface. The barrier for dissociative adsorption of N2 in the presence of coadsorbed hydrogen was determined to be 2.1 f 0.4 kcal/mole. In contrast to the effect of hydrogen, CO preadsorption was found to reduce the population of the N2 -a2 physisorption site, and also to decrease the probability for nitrogen dissociation. These results imply that a2 is a direct molecular precursor for the dissociative adsorption of Nz on Re( 1120).

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