Soot Oxidation Kinetics

Soot and carbon black oxidation kinetics have been measured under controlled temperature, pressure, and oxygen concentration, conditions in a modified High Temperature Fast Flow Reactor. The kinetic measurements are carried out under conditions where the carbon particle consumption rate is controlled by gas particle interactions and not by mass transfer. Auxiliary surface area measurements on partially oxidized particles collected from the HTFFR indicate that the oxidation is controlled by external surface rather than pore-centered reactions. The measured particle reactivities (g cm-2 s-1) are x 10 smaller than predicted by the often used Nagle-Strickland-Constable semiempirical model for carbon oxidation nor do the O2 dependences conform to this model. Additional work is required to elucidate the reasons for this disparity.