Abstract
The Frank-Kamenetskii condition for catalytic ignition (the sudden transition from a kinetically to a mass transport controlled, exothermic catalytic reaction), is explored experimentally and by simulations for the H 2+ 1 2 O 2→H 2O reaction on Pt. At ignition the temperature derivatives of the dissipated chemical power and the heat loss, respectively, are equal [1]. This condition is verified by measurements of the pre-ignition kinetics and calculations taking into account kinetics, heat, and mass transport. The ignition temperature is determined by a competition between hydrogen site blocking on the surface and hydrogen desorption, which makes the ignition temperature increase with increasing H 2/O 2 ratio.
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