Fuels Combustion - Nitrogen Oxides (NOx) Emission

Emission of Nitrogen Oxides - NOx - when combustion fuels like oil, coal, propane and more

Emission of Nitrogen Oxides - NOx - when burning common fuels are indicated in the table below:

FuelEmission of NOx 1)
(g/kg fuel)
Oil 3.0
Kerosene 3.0
Coal 4.5
Propane 2.3
Gasoline 27 3)
Hydrogen 0 2)
Natural Gas 1.0
Butane 2.3
Wood, Birch 20% moisture content 0.7

1) note that the emission varies widely depending on application temperatures and air/fuel ratios. In general - higher combustion temperature and  higher air/fuel ratios increases NOx emissions.

2) zero emission for hydrogen is a theoretically value. In practice hydrogen burned in air produces more NOx than natural gas due to the high flame speed

3) catalytic systems common on most modern vehicles reduces NOx

NOx emissions contributes to eutrophication, acidification and the formation of ground-level ozone.

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