Explosion limits and oxidation characteristics of carbon monoxide

EXPLOSION LIMITS AND OXIDATION CHARACTERISTICS OF CARBON MONOXIDE [Pg.91]

Early experimental work on the oxidation of carbon monoxide was confused by the presence of any hydrogen-containing impurity. The rate of CO oxidation in the presence of species such as water is substantially faster than the bone-dry condition. It is very important to realize that very small quantities of hydrogen, even of the order of 20 ppm, will increase the rate of CO oxidation substantially [8], Generally, the mechanism with hydrogen-containing compounds present is referred to as the wet carbon monoxide condition. [Pg.91]

Obviously, CO oxidation will proceed through this so-called wet route in most practical systems. [Pg.92]

It is informative, however, to consider the possible mechanisms for dry CO oxidation. Again the approach is to consider the explosion limits of a stoichiometric, dry CO—02 mixture. However, neither the explosion limits nor the reproducibility of these limits is well defined, principally because the extent of dryness in the various experiments determining the limits may not be the same. Thus, typical results for explosion limits for dry CO would be as depicted in Fig. 3.5. [Pg.92]

As in the case of H2—02 limits, certain general characteristics of the defining curve in Fig. 3.5 may be stated. The lower limit meets all the requirements of wall destruction of a chain propagating species. The effects of vessel diameter, surface character, and condition have been well established by experiment [2], [Pg.92]

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