Fig. 2.

(A) Experimental setup used for combustion experiments. Using pressure equalization, the hp gas/H₂ mixture was shuttled to the reactor/detection cell containing the Pt catalyst. Oxygen was then injected from the O₂ reservoir. (B) Exported pictures from 100 frame per second video of the reactor upon O₂ delivery. Approximately 100 ms after opening of valve C, minor combustion zones became visible (see white arrows), indicating that the catalytic oxidation of the H₂ gas had commenced. The major combustion event took place 20–30 ms thereafter and the combustion appeared to be largely completed within 80 ms. The reactor outside temperature increase was limited to approximately 5 K.