OT:Technical Question About Rocket Fuel

Hello,
Due to the low activity in other space groups I thought I would post
this question here. With regards to monopropelant rocket fuel which
catalyst works the longest for hydrogen peroxide - silver or iridium.
What I am trying to determine is that with jet packs silver makes it
last for around 20 seconds. Could it be longer when iridium is used?
Joel

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