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Reactions of alkoxy radicals with O2. I. C2H5O radicals

✍ Scribed by Steven Zabarnick; Julian Heicklen

Publisher
John Wiley and Sons
Year
1985
Tongue
English
Weight
899 KB
Volume
17
Category
Article
ISSN
0538-8066

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✦ Synopsis

CzH50NO was photolyzed with 366 nm radiation at -48, -22, -2.5, 23, 55, 88, and 120Β°C in a static system in the presence of NO, 0,, and N,. The quantum yield of CH3CH0, (D{CH3CHO), was measured as a function of reaction conditions. The primary photochemical act is (la) CZHSONO + hv -* CzH50 + NO and it proceeds with a quantum yield $,a = 0.29 2 0.53 independent of temperature. The CzH50 radicals can react with NO by two routes

The C2H,0 radical can also react with 0, via (6) CzH50 + 0, -+ CH,CHO + HO, Values of k 6 / k , were determined at each temperature. They fit the Arrhimius expression: Log(k,/K,) = -2.17 2 0.14 -(924 2 94)/2.303 T. For kz = 4.4 x lo-" cm3/s, k, becomes (3.0 t 1.0) x exp{-(924 t 94)/T} cm3/s. The reaction scheme also provides ke,/Ke = 0.43 ? 0.13, where @a) (8b) -HONO + C2H50 HO + C,H,ONO -H,O + CH,CHO + NO

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