Method for producing nitrogen dioxide

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Offline dle

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Method for producing nitrogen dioxide
« on: 05/10/2007 17:09:42 »
Could someone please tell me the best method for producing nitrogen dioxide gas?

Thanx.

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Offline lightarrow

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Method for producing nitrogen dioxide
« Reply #1 on: 05/10/2007 19:21:26 »
Could someone please tell me the best method for producing nitrogen dioxide gas?

Thanx.

Starting from what? Best in which sense? More rapid, or less expensive or more easy, or what?
If you look for an easy way:

8HNO3 + 3Cu --> 3Cu(NO3)2 + 2NO + 4H2O

then NO reacts immediately with O2 of air at room T forming NO2:

2NO + O2 --> 2NO2

Or, decomposing thermically lead nitrate:

Pb(NO3)2 --> heat --> PbO + 2NO2 + (1/2)O2

Industrially, NO it's produced oxidyzing NH3 with air on a PT-Rh net catalyzer at 800C.

It's possible to make NO from N2 and O2 but it's more difficult: air have to pass through a voltaic arc at 2500-3000C and then be cooled immediately under 500-600C. In this way it's possible to get 6-8% of NO.
« Last Edit: 05/10/2007 19:27:42 by lightarrow »

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Offline DrDick

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Method for producing nitrogen dioxide
« Reply #2 on: 05/10/2007 20:37:22 »
Just drive your car around.   [;)]

Of course, if you wanted to COLLECT that gas, that's another story.

Dick

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Offline dle

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Method for producing nitrogen dioxide
« Reply #3 on: 07/10/2007 13:33:28 »
Thank you.

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Offline lightarrow

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Method for producing nitrogen dioxide
« Reply #4 on: 07/10/2007 13:39:33 »
Just drive your car around.   [;)]

Of course, if you wanted to COLLECT that gas, that's another story.

Dick
Good idea indeed! He should better use a diesel non-Euro4 car (and not an old kind). To collect it (not easy, as you say), he should make the gas pass through cold water or inside a very cold, long metal coil; NO2 will condense in liquid form (as colourless N2O4).