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I am designing an industrial process which can remove oxygen from air. This chemical should combine readily with oxygen in the presence of heat.
In particular, I am looking for a chemical with the following properties:
For point #1, heating is available if it is an endothermic reaction.
I am looking at at an operating temperature of ~$\pu{800 ^\circ C}$.
If $\ce{CO2}$ is acceptable in the feed gas, along with $\ce{CO}$ and a bit of left-over oxygen, then carbon (coal, charcoal etc.) might do. It's ignition temperature is ~1,000 K.
Magnesium is more expensive, but leaves less oxygen and has no gaseous byproduct. It's self-ignition temperature is ~800 K.
Many other materials could be used; it really depends on how the gas is to be used.
If you want to absorb only a small amount of O$_2$ to purify an airstream, you should look up gettering. Titanium metal is one of the most popular if you are willing to heat.
If you are looking to oxidize lots of material, I would look up common reducing agents that are relevant to you in terms of cost, abundance, and toxicity.
