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Title: Reaction of OH radicals with acetone: Determination of the branching ratio for the abstraction pathway at 298 K and 1 Torr
Journal: J. Atmos. Chem.
Volume: 46
Page(s): 1 - 13
Year: 2003
Reference type: Journal article
Squib: 2003TUR/FIT1-13
Reaction:
(CH3)2CO + ·OH → CH3C(O)OH + ·CH3
Reaction order:
2
Reference reaction:
(CH3)2CO + ·OH → Products
Reference reaction order:
2
Temperature:
298
K
Pressure: 1.33E-3 bar
Rate expression:
1.0x10-1±1.0x10-1
Bath gas:
He
Category: Experiment
Data type:
Relative rate value measured
Pressure dependence:
None reported
Experimental procedure:
Flow tube - Data taken vs distance
Excitation technique:
Discharge
Time resolution:
In real time
Analytical technique:
Laser induced fluorescence
Comments:
The authors generated F, Cl, and OH atoms using a discharge flow technique and fed the radicals into a He/acetone mixture to study the reactions. F atoms were generated from a CF4 discharge, while Cl and OH generated by subsequent titrration reactions of F with water or Cl2. They monitored the formation of CH3C(O)CH2 by LIF in real time in each system and used these data to determine the relative rates of H abstraction from acetone.
The two reactions of OH with acetone were assumed to be abstraction and addition/elimination:
OH + CH3C(O)CH3 -> CH3C(O)CH2 + H2O
OH + CH3C(O)CH3 -> [CH3C(O)(OH)CH3]* -> CH3 + CH3C(O)OH
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