Chang, J.S., and Barker, J.R. (1979)
Reaction Rate and Products for the Reaction O(3P) + H2CO
J. Phys. Chem., 1979, 83, 3059
Abstract
The reaction kinetics of O + H2CO have been studied in a discharge-flow
system by using mass spectrometric detection of reactants and products. The
studies were performed under both oxygen atom-rich and formaldehyde-rich
conditions over the temperature range from 296 to 437 K. The global bimolecular
rate constant is in good agreement with other studies and can be expressed as
shown below. Our study differs from others in that our apparatus products can be
observed, and we measured a substantial yield (~30%) of a primary reaction
product with a mass spectral peak at m/e=44; this suggests that the global
reaction rate probably consists of combination, as well as simple abstraction.
For the combination, one hypothesis is that triplet dioximethylene is formed and,
subsequently, rapidly isomerizes to triplet formic acid; the vibrationally
excited triplet formic acid may decompose to form several sets of products,
including HCO + OH and HCO2 + H.
REACTION RATE COEFFICIENTS SUGGESTED IN THIS WORK:
GRI-Mech
Number
('-' sign
means
reverse) |
Reaction |
Rate Coefficient
A T^n exp(-E/RT) |
Temperature
Range
(K) |
A
(mol,cm3,s) |
n
(T in K) |
E
(cal/mol) |
| A |
O + CH2O -> products |
2.29E+13 |
|
3145 |
296-437 |