Peters Four-step Chemistry
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Peters four-step chemistry is a systematically reduced mechanism for
methane Methane ( , ) is a chemical compound with the chemical formula (one carbon atom bonded to four hydrogen atoms). It is a group-14 hydride, the simplest alkane, and the main constituent of natural gas. The abundance of methane on Earth makes ...
combustion Combustion, or burning, is a high-temperature exothermic redox chemical reaction between a fuel (the reductant) and an oxidant, usually atmospheric oxygen, that produces oxidized, often gaseous products, in a mixture termed as smoke. Combustion ...
, named after Norbert Peters, who derived it in 1985. The mechanism reads as :\begin & \text && \ce \\ & \text && \ce \\ & \text && \ce \\ & \text && \ce \end The mechanism predicted four different regimes where each reaction takes place. The third reaction, known as radical consumption layer, where most of the heat is released, and the first reaction, also known as fuel consumption layer, occur in a narrow region at the flame. The fourth reaction is the
hydrogen Hydrogen is a chemical element; it has chemical symbol, symbol H and atomic number 1. It is the lightest and abundance of the chemical elements, most abundant chemical element in the universe, constituting about 75% of all baryon, normal matter ...
oxidation Redox ( , , reduction–oxidation or oxidation–reduction) is a type of chemical reaction in which the oxidation states of the reactants change. Oxidation is the loss of electrons or an increase in the oxidation state, while reduction is ...
layer, whose thickness is much larger than the former two layers. Finally, the
carbon monoxide Carbon monoxide (chemical formula CO) is a poisonous, flammable gas that is colorless, odorless, tasteless, and slightly less dense than air. Carbon monoxide consists of one carbon atom and one oxygen atom connected by a triple bond. It is the si ...
oxidation layer is the largest of them all, corresponding to the second reaction, and oxidizes very slowly.


Peters-Williams three-step chemistry

A three-step mechanism was derived in 1987 by Peters and Forman A. Williams by assuming steady-state approximation for the hydrogen radical. Then, :\begin & \text && \ce \\ & \text && \ce \\ & \text && \ce \end


See also

* Zeldovich–Liñán model


References

{{Reflist, 30em Chemical kinetics Combustion Reaction mechanisms Chemical reactions Methane