Isotope exchange reaction of formate with molecular hydrogen on Ni(110) by IRAS

Akira Yamakata, Jun Kubota, Junko N. Kondo, Kazunari Domen, Chiaki Hirose

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1 Citation (Scopus)


Kinetics of the CH/CD isotope exchange reaction of formate (HCOO(a)/DCOO(a)) on Ni(110) with gaseous D2/H2 was investigated below the decomposition temperature (360 K) by infrared reflection absorption spectroscopy (IRAS). The apparent activation energies of HCOO(a) → DCOO (a) and DCOO(a) → HCOO-(a) reactions were derived as 52 ± 5 and 58 ± 5 kJ·mol-1, respectively. A half-order dependence of the reaction rate on hydrogen pressure was observed, suggesting that the rate-determining step was the reaction of the adsorbed formate with reversibly adsorbed hydrogen atom. The reaction of HCOO(a) with D2 was 2.1 ± 0.3 times faster than that of DCOO(a) with H2 at 300 K, and the origin of the isotope effect is discussed.

Original languageEnglish
Pages (from-to)18177-18182
Number of pages6
JournalJournal of Physical Chemistry
Issue number46
Publication statusPublished - Nov 14 1996
Externally publishedYes

ASJC Scopus subject areas

  • Engineering(all)
  • Physical and Theoretical Chemistry


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