H2 yields were used to demonstrate the activity of the catalysts toward steam reforming of both simulated fuel and jet fuel with 1000 ppm S. Fig. 2a compares the amount of H2 produced relative to that obtained at the beginning of an experiment as a function of time on stream during the steam reforming carried out on 3J1. Since the total deactivation is the critical measure, relative yield is used to eliminate any experimental complications associated with slight differences in catalyst weight placed in the reactor, flow rate of the feed, or flow patterns in the reactor associated with the packing of the catalyst. As seen in the figure, the presence of sulfur caused marked decrease in the H2 yield. It should be emphasized that relative yields of more than 100% simply means that the yield at that time is greater than the yield at the beginning of the experiment. This means that there is an initial activation period where the catalyst activity for hydrogen yield was seen to grow with time until a maximum value is reached. This behavior was independent of the presence of sulfur.