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The elementary reaction of O(3P) atoms with Cr(CO)6 in the gas phase

✍ Scribed by W. Hack; A. Rössing

Publisher
Elsevier Science
Year
1990
Tongue
English
Weight
469 KB
Volume
171
Category
Article
ISSN
0009-2614

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✦ Synopsis

The reaction of Cr( CO)s with 0 ("P) atoms was studied in an isothermal discharge-flow reactor with He and Ar as a main carrier gas. 0 atoms were produced by discharging Os/He mixtures. The species in the flow system were detected with a quadrupole mass spectrometer via a molecular-beam system. The rate constant of the reaction 0(3P) +Cr( CO)(+products was measured at a pressure of p=2 mbar under pseudo-first-order conditions [O],,= [Cr(CO)& by following the [Cr(CO),] decay: k(298 K)= (1.2kO.3) X 10" cm' mol-' s-'. The reaction product CO2 was detected directly in the pressure range S$pg 10 mbar. Cr oxides or Cr atoms or clusters were not observed in the gas phase as products of the above reaction. Cr(CO)s was observed indirectly via the formation of CI(CO)~ in the reaction Cr(CO)S tCO+Cr(C0)6.

For the first reaction the primary step Cr(C0)6+0+C02tCr(CO), is discussed.

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