April 20, 2025, 03:40:47 AM
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Chemical Engineering Forum / Re: NO2 reduction
« Last post by Borek on Yesterday at 05:43:35 PM »
Can't think of anything that can be done.

Reaction speed basically depends of concentrations (or pressure) and temperature - if you keep these constant, reaction speed doesn't change.

You can speed up the reaction with catalyst or slow it down with an inhibitor - but that requires adding something to the mix (changing container material won't change much, as this particular reaction takes place in the bulk).

Sometimes it is possible to speed up the reaction with ionizing radiation (UV and dental cement for example), but that's opposite of what you need.
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Chemical Engineering Forum / Re: NO2 reduction
« Last post by Gamel on Yesterday at 02:05:21 PM »
I can't change pressure or composition. I have only physical means.
I can play with the container where the gas is in. Modify its material.
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Chemical Engineering Forum / Re: NO2 reduction
« Last post by Hunter2 on Yesterday at 01:47:13 PM »
What is the purpose  to do so.
I think you can only decrease pressure or rise temperature.
Also removing oxygen will shift to NO.
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Chemical Engineering Forum / NO2 reduction
« Last post by Gamel on Yesterday at 12:40:57 PM »
Hello
This is quite basic but I'm not an expert in chemistry...
2NO +O2 -> 2NO2
I need to slow down this reaction as much as possible, but the concentration of NO and O2 is fixed, and so is temperature and pressure. I can't add other chemicals...
Is there anything else that can be done e.g. applying electric voltage, magnetic fields, use the force...?
Thanks!
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7
Inorganic Chemistry Forum / Re: Less toxic substitute for Hydrazine?
« Last post by TheodorCurtius on April 16, 2025, 06:04:34 PM »
You could try formazine...It is used in the combustion synthesis of various semiconductors IIRC. It can be synthesized from the reaction of hydrazine sulfate and hexamine and precipitates from aqueous solutions as an insoluble and relatively benign polymer.
https://en.wikipedia.org/wiki/Formazine
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Found this cool document describing the synthesis of sodium nitrate and sodium nitrite by simple electrolysis of ammonia with iron electrodes!

https://figshare.com/articles/journal_contribution/Amateur_synthesis_of_sodium_nitrate_and_sodium_nitrite_by_electrolytic_oxidation_of_ammonia_in_a_diaphragm_separated_cell/28806389?file=53701400

Thought it might be interesting to share...
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Good idea.  We have made other nitro-aromatics or -heteroaromatics and the carbon attached to the nitrogen is often broader than the others.
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The signals may be overlapping. You can change solvent to pull them apart or use INEPT if they have different multiplicity I think.
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