| (57) The method of combusting lean fuel-air mixtures comprising the steps of:
a. obtaining a gaseous admixture of fuel and air, said admixture having an adiabatic
flame temperature below a temperature which would result in any substantial formation
of nitrogen oxides but above about 800 ° Kelvin;
b. contacting at least a portion of said admixture with a catalytic surface (31) and
producing reaction products; and
c. passing said reaction products to a thermal reaction chamber (33), thereby igniting
and stabilizing combustion in said thermal reaction chamber.
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