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The reaction of the hydroxyl radical with acetylene

✍ Scribed by J. E. Breen; G. P. Glass

Publisher
John Wiley and Sons
Year
1971
Tongue
English
Weight
478 KB
Volume
3
Category
Article
ISSN
0538-8066

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✦ Synopsis

The reaction of OH with acetylene was studied in a discharge flow system at room temperature. OH was generated by the reaction of atomic hydrogen with NO2 and was monitored throughout the reaction using ESR spectroscopy. Mass-spectrometric analysis of the reaction products yielded the following results: (1) less than 3 molecules of OH were consumed, and less than 2 molecules of H20 were formed for every molecule of acetylene that reacted; (2) CO was identified as the major carbon-containing product; (3) NO, formed in the generation of OH, reacted with a reaction intermediate to give among other products N20. These observations placed severe limitations on the choice of a reaction mechanism. A mechanism containing the reaction OH + CzHz -+ HCzO + Hf better accounted for the experimental results than one involving the abstraction reaction OH + C ~H Z -+ C2H + HzO. The rate constant for the initial reaction was measured as 1.9 f 0.6 X cm3 molecule-' sec-I.

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