Peroxyacetyl nitrate

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Peroxyacetyl nitrate
IUPAC name
Systematic IUPAC name
ethanoic nitric peroxyanhydride
Other names
peroxyacetyl nitrate
2278-22-0 N
ChemSpider 15907
EC number 218-905-6
Jmol-3D images Image
PubChem 16782
Molar mass 121.05 g mol−1
1.46 × 10 5 mg l−1 at 298 K
log P −0.19
Vapor pressure 29.2 mmHg at 298 K
0.000278 m³ atm mol−1 at 298 K
Atmospheric OH rate constant
10−13 cm³ molecule−1 s−1 at 298 K
Except where noted otherwise, data is given for materials in their standard state (at 25 °C (77 °F), 100 kPa)
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Infobox references

Peroxyacetyl nitrate is a peroxyacyl nitrate. It is a secondary pollutant present in photochemical smog. It is thermally unstable and decomposes into peroxyethanoyl radicals and nitrogen dioxide gas. It is a lachrymatory substance.

Peroxyacetyl nitrate, or PAN, is an oxidant more stable than ozone. Hence, it is better capable of long-range transport than ozone. It serves as a carrier for oxides of nitrogen (NOx) into rural regions and causes ozone formation in the global troposphere.

The formation of PAN on a secondary scale becomes an issue when ethanol is used as an automotive fuel. Acetaldehyde emissions increase, which subsequently react in the atmosphere to form smog. Whereas ethanol policies solve domestic oil supply problems, they drastically exacerbate air quality conditions.[citation needed]

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