Abstract
The addition of molecular oxygen was found to increase the rate of rem oval of hydrogen atoms in a flow system at and below room temperature. Kinetic studies of this process using argon carrier showed that the rate-determining step is the third-order reaction H + O2 + Ar = HO
2
+ Ar. (2) Atomic oxygen in small concentrations is produced in the system. Product analysis and measurements of oxygen atom concentrations indicated that the principal reactions removing HO
2
under these conditions are H+HO
2
= H
2
+O
2
, (12a) H+HO
2
= OH+OH, (12b) H+HO
2
= H
2
O+O
2
, (12c) A value for k
2
of 2.2 x 10
-32
cm
6
molecule
-2
s
-1
was determined at 293 °K. Reaction (2) was found to have a small negative temperature coefficient. These data and values of
k
2
from explosion limit studies can be represented by the expression k
2
= 1.3 x 10
-33
exp (+ 1600 + 700/
RT
) cm
6
molecule
-2
s
-1
in the range 250 to 800 °K. The third-body efficiencies in reaction (2) at 293 °K of He and H
2
O relative to Ar are similar to those obtained from data on the second explosion limit at higher temperatures.
Reference28 articles.
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