Shock Tube Study of Reactions of C Atoms with H2 and O2 Using Excimer Photolysisof C3O2 and C Atom Atomic Resonance Absorption Spectroscopy

摘要

The reactions of C(3P) with H2 and O2 were studied at high temperature inreflected shock wave experiments. C atoms were detected at 156.1 nm by atomic resonance absorption spectroscopy (ARAS). Controlled levels of C atoms for calibrating the ARAS diagnostic were made by high-temperature pyrolysis of highly dilute CH4/Ar mixtures. For kinetics experiments, C atoms were formed by pyrolysis of C3O2 above 2300 K and by ArF excimer photolysis of C3O2 below 2050 K. Atomic carbon is an important reactive component of hydrocarbon flames. Although a minor species in most combustion situations, C atoms play a role in hydrocarbon oxidation and in NOx formation and removal. Several workers have postulated reaction -1 to be the principal source of C atoms in rich hydrocarbon flames.