NOVELTY - Reducing coke fouling of a burner tip (1) when combusting a waste gas stream, comprises providing at least one waste gas stream containing a mixture of methane, oxygen, and in-situ molecular hydrogen and a minor amount of at least one unsaturated hydrocarbon, at least one of coating the interior surface and impregnating the body (2) with at least one of a hydrogenation catalyst and a combustion catalyst, and combusting the waste gas stream using the catalyst carrying burner tip.    USE - The method is useful for reducing coke fouling of burner tip when combusting waste gas stream to produce olefins such as ethylene, propylene, butenes, butadiene, and aromatics such as benzene, toluene, and xylenes.    ADVANTAGE - The method is capable of economically and completely reducing the coke fouling of burner tip by preventing the degradation of the combustibility characteristics of the clean fuel gas.    DETAILED DESCRIPTION - Reducing coke fouling of a burner tip when combusting a waste gas stream, where the burner tip comprises a body having an inlet end (4) and an outlet end (5), an internal channel within the body connecting the inlet and outlet ends and exposing an interior surface of the body to the internal channel, and the waste gas stream is passed through the internal channel from the inlet end and combusted at the outlet end, comprises providing at least one waste gas stream containing a mixture of methane, oxygen, and in-situ molecular hydrogen and a minor amount of at least one unsaturated hydrocarbon that forms coke at the temperature of combustion of the waste gas stream, at least one of coating the interior surface and impregnating the body with at least one of a hydrogenation catalyst that promotes the hydrogen saturation of the at least one unsaturated hydrocarbon and a combustion catalyst that promotes the combustion of the at least one unsaturated hydrocarbon and carbonaceous residue, and combusting the waste gas stream using the catalyst carrying burner tip.    DESCRIPTION OF DRAWING(S) - The figure shows a longitudinal cross-section of a burner tip.    Burner tip (1)    Body (2)    Internal channel (3)    Inlet end (4)    Outlet end. (5)