[vhpk]

Can u show me a method to separate NO and NO₂ out of the mixture.
I only know the method to decrease the temperature to make NO2 into N₂O₄ so we can separate it.But I think it's not good, can u help me?

[hmx9123]

Mix the gasses with oxygen.  It will cause any NO to be oxidized up to NO2.  Then N2O4 can be condensed out as a liquid and the excess O2 can be pumped off.  You will know if you have pure N2O4 because it goes from a red-brown gas to a clear solid.  If you get a blue-green color, you've got NO in there.  Then let the N2O4 warm back up and you'll get the NO2 back again.