I am looking for an Oxygen absorbing material which will absorb Oxygen fairly quickly. Ideally, what I would like to do pass a stream of gas through a tube filled with this Oxygen absorber as well as a water absorbing material (possibly CaCl2) so as to remove as much Oxygen gas and water vapor as I can. Since the gas will be flowing through the tube, there will not be much time for it to react with whatever materials I use, but I want to “clean out” as much of the undesirable gasses as I can. I think they use Iron Oxide (Fe3O4) as an Oxygen absorber for some foods [like beef jerky], but this would be much too slow for my needs I think. The Oxygen absorber should not absorb any Hydrogen gas, but it can (optionally) absorb just about anything else like N2, CO2, …., but Oxygen gas is the priority.