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Reactor studies for exhaust oxidation rates.

Lord HA; Sondreal EA; Kadlec RH; Patterson DJ
Int'l Auto Eng Cong Detroit Mich 1973 Jan; :1-12
A laboratory test reactor has been used to determine the rates of oxidation of carbon monoxide (co), hydrocarbons (hcs) as a class, and hydrogen (h2). The feed was supplied from the exhaust of a single-cylinder engine, with additions of h2 and CO in some runs. The test reactor was designed to be well mixed, and this was verified experimentally for mixing on macroscopic and microscopic scales. Wall effects were found to be unimportant. Kinetic data from 157 runs were correlated with global reaction rate expressions containing arrhenius temperature dependence and power law concentration dependence. Co oxidation was found to be approximately 1/4 order in CO with an activation energy of 28,200 cal/g-mole. Hc oxidation was found to be approximately 1/4 order in hc and 1/2 order in each of o2, CO, and no with an activation energy of 29,800 cal/g-mole. H2 oxidation rates were not well correlated, but a zero-order rate with an activation energy of 52,000 cal/g-mole is reasonable. Simulations of the test reactor were compared with experimental data with excellent agreement. These simulations demonstrate that higher orders for these reactions, reported in the literature, may be attributable to mixing limitations in those experiments.
Publication Date
Document Type
OP; Conference/Symposia Proceedings
Fiscal Year
Identifying No.
OP 135-73
NIOSH Division
Source Name
Int'l. Auto. Eng. Cong., Detroit, Michigan, Jan. 8-12, 1973, SAE Preprint 730203, Jan. 1973
Page last reviewed: October 8, 2021
Content source: National Institute for Occupational Safety and Health Education and Information Division