Pulse Radiolysis Studies. XVI. Kinetics of the Reaction of Gaseous Hydrogen Atoms with Molecular Oxygen by Fast Lyman‐αAbsorption Spectrophotometry

1970 ◽  
Vol 52 (6) ◽  
pp. 3210-3216 ◽  
Author(s):  
W. P. Bishop ◽  
Leon M. Dorfman
Keyword(s):  
Molecular Oxygen ◽  
Pulse Radiolysis ◽  
Gaseous Hydrogen ◽  
Hydrogen Atoms ◽  
Kinetics Of

Rates of elementary processes in the chain reaction between hydrogen and oxygen II. Kinetics of the reaction of hydrogen atoms with molecular oxygen

1963 ◽  
Vol 275 (1363) ◽  
pp. 559-574 ◽  
Keyword(s):  
Molecular Oxygen ◽  
Kinetic Studies ◽  
Negative Temperature ◽  
Product Analysis ◽  
Hydrogen Atoms ◽  
The Third ◽  
Rate Determining Step ◽  
A Value ◽  
Explosion Limit ◽  
Kinetics Of

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.

Reaction kinetics of gaseous hydrogen atoms with graphite

1969 ◽  
Vol 73 (5) ◽  
pp. 1348-1351 ◽  
Author(s):  
Bernard J. Wood ◽  
Henry Wise
Keyword(s):  
Reaction Kinetics ◽  
Gaseous Hydrogen ◽  
Hydrogen Atoms ◽  
Kinetics Of

The kinetics of Oxidation of N-Methylacridan: A Model for Coenzyme 1

1953 ◽  
Vol 6 (4) ◽  
pp. 409 ◽  
Author(s):  
SJ Leach ◽  
JH Baxendale ◽  
MG Evans
Keyword(s):  
Electron Transfer ◽  
Hydrogen Atom ◽  
Molecular Oxygen ◽  
Hydrogen Atom Transfer ◽  
Second Order ◽  
Atom Transfer ◽  
Hydrogen Atoms ◽  
Kinetics Of Oxidation ◽  
Conjugate Acid ◽  
Kinetics Of

The rates of oxidation of N-methylacridan by 2,6-dichlorophenolindophenol have been measured between pH 2.74 and 6.91 at 20 to 22 �C in the presence of 8 to 22 per cent. ethanol. The reaction was of the second order and was found to proceed by ' two simultaneous mechanisms, both involving the conjugate acid of N-methylacridan. The oxidation of this cation by the indophenol anion proceeded at a rate which was 19 times greater than the oxidation by the uncharged indophenol molecule. It is shown that oxidation probably occurs by hydrogen atom transfer rather than electron transfer. A similar mechanism for the oxidation of dihydro-coenzyme I would account for its slow reactivity towards molecular oxygen and the biological necessity for mediating systems involving both hydrogen atoms and electrons.

scholarly journals Kinetics of 1- and 2-methylallyl + O2 reaction, investigated by photoionisation using synchrotron radiation

2021 ◽  
Author(s):  
Domenik Schleier ◽  
Engelbert Reusch ◽  
Marius Gerlach ◽  
Tobias Preitschopf ◽  
Deb Pratim Mukhopadhyay ◽  
...  
Keyword(s):  
Synchrotron Radiation ◽  
Reaction Kinetics ◽  
Molecular Oxygen ◽  
Light Source ◽  
Storage Ring ◽  
Vacuum Ultraviolet ◽  
Flow Tube ◽  
Tube Reactor ◽  
Swiss Light Source ◽  
Kinetics Of

The reaction kinetics of the isomers of the methylallyl radical with molecular oxygen has been studied in a flow tube reactor at the vacuum ultraviolet (VUV) beamline of the Swiss Light Source storage ring.

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