In the work reported herein, we have extended the studies of HOPG and vitreous carbon to a porous carbon network in order to analyze the similarities and differences between the reactive and inelastic scattering dynamics of O atoms on flat sp 2 carbon surfaces and an sp 2 carbon fiber network that is used in composite heat-shield materials. In addition to the potential differences in the oxidation reactions caused by the local carbon surface morphology, the scattering dynamics on a three-dimensional structure are expected to be much more strongly influenced by multiplebounce scattering than the scattering dynamics on two-dimensional surfaces such as vitreous carbon and HOPG.