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I need to generate pure gas from a gas stream which is free of $\ce{SO2}$/$\ce{NO}$/$\ce{NO2}.$ The air is already pretreated by activated carbon and purafil. However, I can't find any solution for removing trace level of this pollutants. I find that many solutions of capturing for large scale like flue gas. However, it is not suitable for trace level (1–10 ppb).

I know $\ce{O3}$ can react with $\ce{NO}$ to $\ce{NO2}$. However, as I mentioned, I need the gas stream free of $\ce{NO}$ and $\ce{NO2}$ simultaneously. So, converting $\ce{NO}$ to $\ce{NO2}$ is not the answer.

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    $\begingroup$ Can you describe what are you doing? Which pure gas and how it is being generated? Is this a science project? $\endgroup$
    – ACR
    Commented Dec 24, 2019 at 2:45
  • $\begingroup$ You may have the gas mixture bubble in a NaOH solution, or wash it through a column with flowing NaOH solution at countercurrent. SO2 and NO2 will be dissolved. And if some O2 is also present, NO will soon be oxidized into NO2, and then dissolved. $\endgroup$
    – Maurice
    Commented Dec 24, 2019 at 10:24
  • $\begingroup$ If you cool it what will liquify first and last? $\endgroup$
    – B. Kelly
    Commented Dec 26, 2019 at 5:44
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    $\begingroup$ As I mentioned, I need the gas stream free of NO and NO2 simultaneously. So, converting NO to NO2 is not the answer. Thanks. @Maurice $\endgroup$
    – user5151477
    Commented Dec 30, 2019 at 6:46
  • $\begingroup$ I need to purify the gas stream to zero ppb of SO2/NO/NOX. The gas is pre-treated by purafil and activated carbon. The flow rate is around 5 lpm. @DrMoishe Pippik $\endgroup$
    – user5151477
    Commented Dec 30, 2019 at 6:48

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Removal of $\ce{SO2, NO2}$ from solution

As mentioned by Maurice, you can remove $\ce{SO2, NO2}$ by bubbling the mixture bubble through NaOH or KOH solution, or washing it through a column with flowing NaOH or KOH solution at countercurrent.

Removal of $\ce{NO}$ from solution

You can bubble the mixture through $\ce{aq.FeSO4}$ solution. I remember doing this in eudiometry experiments.

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