# Removing ozone from a gas flow

I have a potential problem in that I need to reliably remove ozone from a stream of ionized gases, mostly air. The flow rate is quite low, less than 400 sccm. I was thinking of something catalytic, maybe platinum mesh? There may well be a related need to remove any $$\ce{NO_x}$$ created. I am open to suggestions — it's mainly a health and safety issue if it vents into the air.

• I was thinking about cheap antioxidants. You might be interested in this paper: sciencedirect.com/science/article/abs/pii/S0003986106001652 May 10 '19 at 17:35
• 400 ccm is not a flow rate. Per hour? Per microsecond?
– Karl
May 10 '19 at 17:47
• @Karl Should be sccm May 10 '19 at 19:28
• You should look for catalytic decomposition of ozone into oxygen rather than searching for chemical reactions. See this article Gas phase ozone decomposition catalysts, sciencedirect.com/science/article/pii/S0926337396000446 May 10 '19 at 21:17

The provision of the flux of 400 mL/min only partly describes your problem. It neither states the concentration of ozone in this input, nor the regime of this input -- it may be in batches, it could be a contiously working line. With these uncertainties in hand, bubbling the ozone-containing gas input into an aqueous solution of sodium hydrogensulfite (with "i", $$\ce{NaHSO3}$$) seems both simple to setup, manage, and scale. The reaction basically will yield sodium sulfate ($$\ce{Na2SO4}$$).
As an example, Ragan et al. published about an Ozonolysis at large industrial scale I hereby refer to. For about 19 h, their recation was running at low temperature with a constant flow of 15-20 L/min, 4-5 wt% $$\ce{O3}$$ in air bubbled across their reaction vessel. After completion of reaction, their workup reported was pouring the reaction solution slowly (over 30 min) to a prechilled quench solution of 3.0 kg $$\ce{NaHSO3}$$ in 6 L water at 0 degC. Only then they allowed the mixture to warm slowly to room temperature.