Halo
Could anyone please guide whether CO produced during CH4 oxidation/combustion will follow Dry or Wet CO oxidation mechanism. Air required for combustion is moisture free, but H2O (H-OH Ions) have already produced during CH4 oxidation mechanism.
(a- 2CH4 + 3O2 -> 2CO + 4H2O
b- 2CO + O -> 2CO2)
Chemical reaction kinetics and mechanism is completely different for CO if H2O is considered.
Thank You
the reaction rate equation used depends on your objective.If the objective is to produce CO then from equation a )it means that rate of formation of CO is equal to the rate of consumption of CH4 . and from b) rate of oxidation of CO is equal to the rate of formation of CO.Apparently , it is dry but depends on temperature and pressure conditions if the H2O formed in step 1 decomposed or not.
@U. Dreher
@Dr Shahid Munir
Thank You very much for your guidance. I am doing complete combustion of CH4 (not steam reforming), purpose is to generate heat which will be used to decompose CaCO3 to CaO(Product). I need detailed reaction kinetics information for Ch4 combustion (Two step Combustion a & b), which will be used in Aspen simulation. Through literature, i have found kinetics for reaction (a) , but there are two types of kinetics available for reaction (b), wet and dry. So which reaction mechanism and kinetics should i follow for reaction (b), wet or dry(very slow reaction)
Thank You and Happy New Year!
Dear Ejaz, I am not very supportive of this mode of searching for correct answers and guidance. There are substantial pieces of work addressing specifically your question stemming back to as early as 1972 (at least), including my own thesis at that point. While a literature search would address this question more than adequately I believe, the response above do not provide much in the way of reasonable guidance. Taking a look at the following publications should give you some guidance as to where to start....but there are many more in the literature....Westbrook and Dryer (1981) Combust Sci Tech 27 31 43; Yetter et al (1988) 21st Symp int Combust 749 760.
As little as a few ppm of water vapor present has been shown to affect the dry CO oxidation so significantly that "dry" CO oxidation is significantly perturbed. Please take at least a cursory look at the literature.
Dear Sir Dryer, Thank you very much for your guidance. I have already gone through some of your publications and found them very helpful. Thank You very much for your time.
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