Accession Number:

ADA053695

Title:

Shock Tube Studies of Formaldehyde Pyrolysis.

Descriptive Note:

Technical rept.,

Corporate Author:

PURDUE UNIV LAFAYETTE IND PROJECT SQUID HEADQUARTERS

Report Date:

1978-04-01

Pagination or Media Count:

27.0

Abstract:

Formaldehyde decay was followed by IR emission at 3.5 micrometers behind relfected shocks at total concentrations near 2.4 and 4.5 x 10 to the 18th power moleculecc. Data were obtained at 0.5 microsec intervals over a temperature range of 1700-2710 K for mixtures containing 0.1, 0.5, and 1.0 CH2O in Ar. Exponential decay was observed in all cases at lower temperatures there was evidence of an induction time prior to the onset of the decay. An apparent rate was defined as ka -dln signaldtM ka was observed to be first order in argon and to decrease with increasing dilution. These data were analyzed in terms of the mechanism 1 CH2O M HCO H M 2 CH2O H HCO H2 3 HCO M H CO M 4 HCO H H2 CO. Using literature values for k2, k3, and k4, a reasonable fit to all the data, both in terms of temperature and concentration dependence, was obtained with k1 6.0 x 10 to the -7th power exp-364 kJRT ccmolecule s. Evidence is also presented to suggest that the reaction, CH2O M CO H2 M, does not play a significant role in the high temperature pyrolysis of formaldehyde. Author

Subject Categories:

  • Organic Chemistry
  • Physical Chemistry
  • Combustion and Ignition

Distribution Statement:

APPROVED FOR PUBLIC RELEASE