The Inhibition of the CO/H20/02Reaction by Trace Quantities of HCl

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Abstract
The inhibition of the CO/H20/02 reaction by small quantities or HCl was studied in a high temperature, atmospheric pressure flow reactor at temperatures near 1000K. The initial species concentrations of the CO/H30/02; reaction bath were kept constant at about l%/0·6%/0·5% respectively, while the initial concentration of HCl was varied from 0. to 200ppm. These mixtures provided a stoichiometry close to unity with a Cl/H ratio ranging from 0. to 0·016. Results indicated that these small Cl/H ratios can significantly inhibit both the induction time and the reaction rate of CO oxidation. The concentration of HCl was measured by an FTIR spectrometer and was observed to vary throughout the reaction. The mole fraction of HCl was observed to decrease until approximately 50% of the CO was consumed and to slowly rise afterwards. The inhibitory effect of HCl on the CO oxidation rate was observed to decrease after the minimum measured HCl concentration. The experimental results were compared with a reaction model published in the literature and showed significant discrepancy.