Three -way catalysts will only give full conversion of each of these three pollutants in a gas stream containing a stoichiometric ratio of CO and NOx, as shown in the figure below.
There are many reaction pathways in a Three -way catalyst system, including those shown for the . The most important reactions for removing NOx can be summarised as:
2CO+2NO→2CO2+N2
4HC+10NO→4CO2+2H2O+5N2
2CO+2NO→2CO2
4HC+5O2→4CO2+2H2O
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