Abstract
Calculations using a chemical kinetic model for the oxidation process of unburned methanol were carried out on exhaust gases from a methanol fueled S.I. engine at air-fuel equivalence ratios of 0.8, 1.0, 1.2, and 1.4. Good correlation between the calculated and experimental results were obtained for methanol reaction behavior as well as formaldehyde concentration profile. The conversion reaction of nitric oxide to nitrogen dioxide plays a significant role in the oxidation of unburned methanol and the formation of formaldehyde. The presence of molecular oxygen in exhaust gases has a favorable effect on this conversion. However rich the oxygen may be, methanol oxidation is extremely slow in the absence of nitric oxide. With rich oxygen, methanol oxidation is rapid due to an increasing nitric oxide. It is explained by considering those effects how the methanol reaction rate attains a maximum value in exhaust gases between airfuel equivalence ratios of 1.0 and 1.2.
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