Furthermore, FiberForm would have a higher oxygen coverage compared to vitreous carbon and the Boudouard reaction would thus be favored in FiberForm. In contradiction to the expected higher reactivity and thus depletion rate of CO2 on FiberForm vs. vitreous carbon, the observed CO2 signals persist at higher sample temperatures for FiberForm than for vitreous carbon. Finally, we see two distinct slow processes (TD-slow1 and TD-slow2) in TOF distributions of CO and it is improbable that the same reaction would exhibit two different rate constants. Thus, we conclude that it is unlikely that the TD-slow1 and TD-slow2 signals in the CO TOF distributions, either from FiberForm or vitreous carbon, originate from a Boudouard reaction.