How is CO produced by burning LPG?

Answer 1

Carbon monoxide is released in the combustion of liquid petroleum gas due to the incomplete oxidation of some fractional components, including propane, when a buildup of exhaust gas reduces the oxygen available to the flame. Almost all of the gas released by properly functioning heaters is carbon dioxide, and heated carbon monoxide may be carried away through a vent or exhaust.

For propane, the comparative reactions are:

(excess O2)

C3H8 + 5 O2 → 3 CO2 + 4 H2O + heat

(insufficient O2)

C3H8 + 4.5 O2 → 2 CO2 + CO + 4 H2O + heat

Answer 2

When LPG is burned, carbon atoms in the fuel combine with oxygen in the air to produce carbon dioxide (CO2). However, in situations where there is not enough oxygen for complete combustion, some carbon atoms combine with oxygen to form carbon monoxide (CO) instead. This incomplete combustion of LPG can occur in poorly ventilated areas or when there is insufficient air supply to the burner.