Just thinking about this in terms of the different grades of allowable hazards in workplace health and safety. There are concentrations of chemicals that are long term damaging, damaging after 8 hours, 4 hours, 20 minutes, 1 minute, that sort of thing.
So if you’re on a ship or otherwise enclosed facility with xenomorphs and you access to ammonia, which is a strong base, could you spill it all over the place marking your territory like a cat, making the entire area maybe harmful to humans after 12 hours with our neutral blood pH but far more harmful or immediately deadly to xenomorphs with their highly acidic blood?
If you made yourself reek of ammonia, and just towed a wagon of ammonia jugs everywhere you went, could you make your way to the HVAC room and dump jug after jug into the air handling unit and make the ammonia vapour concentration in the air at a level that would be a nuisance level for humans, but harmful and eventually deadly to xenos?
Also is that why cats always seem to survive where xenos are present? Their urine has so much ammonia the xenos just stay away?
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What an… oddly specific question.
Probably not, considering they do just fine in other environments that have to be full of the smell of chemicals. And can survive in places with zero oxygen for a an extended period of time, meaning that they would have no trouble holding their breath long enough to catch and kill you.
Considering how molten lead and plasma weapons are more an inconvenience to them I highly doubt ammonia will do anything. Only thing that stops them is death or loss of a viable host species. Giving yourself something like imminent heart failure or some disease they can smell, while also posing no threat to them is your best option.