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In one embodiment, a system includes a fuel nozzle that includes a fuel injector that includes a fuel port and a premixer tube. The premixer tube includes a wall disposed about a central passage, multiple air ports extending through the wall into the central passage, and a catalytic region. The cata

In one embodiment, a system includes a fuel nozzle that includes a fuel injector that includes a fuel port and a premixer tube. The premixer tube includes a wall disposed about a central passage, multiple air ports extending through the wall into the central passage, and a catalytic region. The catalytic region includes a catalyst, disposed inside the wall along the central passage, configured to increase a reaction of fuel and air.

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1. A system, comprising: a fuel nozzle, comprising: a fuel injector having a conical body portion comprising a fuel port; anda premixer tube, comprising: a wall disposed about a central passage;a plurality of air ports extending through the wall into the central passage; anda catalytic region compri

1. A system, comprising: a fuel nozzle, comprising: a fuel injector having a conical body portion comprising a fuel port; anda premixer tube, comprising: a wall disposed about a central passage;a plurality of air ports extending through the wall into the central passage; anda catalytic region comprising a catalyst disposed inside the wall along the central passage, wherein the catalyst is configured to increase a reaction of fuel and air, wherein the catalytic region comprises a catalytic structure extending radially inward and away from an inner surface of the wall into the central passage, the catalytic structure comprising a plurality of flat catalytic fins extending from the inner surface, and wherein the conical-shaped fuel injector is disposed inside the premixer tube upstream from the catalytic region. 2. The system of claim 1, wherein the catalytic region comprises a catalytic coating of the catalyst disposed along an inner surface of the wall. 3. The system of claim 1, wherein the catalytic region comprises a catalytic insert of the catalyst disposed along an inner surface of the wall. 4. The system of claim 1, wherein the catalytic region contains a fuel rich mixture of the fuel and air. 5. The system of claim 1, wherein the catalyst comprises a noble metal. 6. The system of claim 1, wherein the plurality of air ports comprises a first air port disposed upstream of the catalytic region that extends through the wall into the central passage, and the plurality of air ports comprises a second air port disposed downstream of the catalytic region that extends through the wall into the central passage. 7. The system of claim 1, wherein the plurality of air ports comprises a teardrop shaped air port having first and second portions disposed one after another along a flow direction through the central passage, wherein the second portion is narrower than the first portion, and the second portion is elongated along the flow direction. 8. The system of claim 1, wherein the premixer tube comprises an outlet having a gradually expanding annular portion of the wall that forms a bell-shape. 9. The system of claim 1, wherein the premixer tube comprises an outlet having a flame stabilizer, wherein the flame stabilizer comprises an outer ring, a center body, a plurality of struts extending from the outer ring to the center body, wherein the center body comprises a central passage extending from an upstream side to a downstream side of the center body and the central passage extends through the center body, and the center body comprises an outer surface that expands in diameter from the upstream side to the downstream side. 10. A system, comprising: a fuel nozzle, comprising: a fuel injector comprising a fuel port; anda premixer tube, comprising: a wall disposed about a central passage;a plurality of air ports extending through the wall into the central passage;an outlet region comprising a bell-shaped wall and a flame stabilizer, wherein the bell-shaped wall comprises a non-expanding portion located upstream of an expanding portion, and the non-expanding portion is concentrically disposed about a downstream end of the wall and the flame stabilizer; anda catalytic region comprising a catalyst disposed inside the wall along the central passage, wherein the catalyst is configured to increase a reaction of fuel and air, wherein the catalytic region comprises a catalytic structure extending radially inward and away from an inner surface of the wall into the central passage, the catalytic structure comprising a plurality of flat catalytic fins extending from the inner surface, and wherein the fuel injector is disposed inside the premixer tube upstream from the catalytic region. 11. The system of claim 10, wherein the bell-shaped wall comprises an annular wall having a diameter that gradually expands from the upstream end portion to a downstream end portion. 12. The system of claim 11, wherein the diameter of the annular wall gradually expands in a non-linear manner. 13. The system of claim 10, wherein the flame stabilizer is disposed upstream of the bell-shaped wall. 14. The system of claim 10, wherein the flame stabilizer comprises an outer ring, a center body, a plurality of struts extending from the outer ring to the center body. 15. The system of claim 14, wherein the center body comprises a central passage extending from an upstream side to a downstream side of the center body and the central passage extends through the center body, and the center body comprises a conical outer surface that expands in diameter from the upstream side to the downstream side. 16. A system, comprising: a fuel nozzle, comprising: a fuel injector having a conical body portion comprising a fuel port; anda premixer tube, comprising: a wall disposed about a central passage;a plurality of air ports extending through the wall into the central passage, wherein the plurality of air ports comprises a first teardrop shaped air port having first and second portions disposed one after another along a flow direction through the central passage, wherein the second portion is narrower than the first portion, the second portion comprises a constant width along a portion of a length of the second portion, and the second portion is elongated along the flow direction, wherein the conical-shaped fuel injector is disposed inside the premixer tube; anda catalytic region comprising a catalyst disposed inside the wall along the central passage, wherein the catalyst is configured to increase a reaction of fuel and air, wherein the catalytic region comprises a catalytic structure extending radially inward and away from an inner surface of the wall into the central passage, the catalytic structure comprising a plurality of flat catalytic fins extending from the inner surface, and wherein the conical-shaped fuel injector is disposed inside the premixer tube upstream from the catalytic region. 17. The system of claim 16, wherein the flow direction and the second portion are oriented at an angle non-parallel to a longitudinal axis of the central passage. 18. The system of claim 16, comprising a second teardrop shaped air port downstream from the first teardrop shaped air port, wherein a first total area of the first teardrop shaped air port is smaller than a second total area of the second teardrop shaped air port. 19. A system, comprising: a fuel nozzle, comprising: a fuel injector having a conical body portion comprising a fuel port; anda premixer tube, comprising: a wall disposed about a central passage;a plurality of air ports extending through the wall into the central passage;a catalytic region comprising a catalyst disposed inside the wall along the central passage, wherein the catalyst is configured to increase a reaction of fuel and air, wherein the conical-shaped fuel injector is disposed inside the premixer tube upstream from the catalytic region; andan outlet having a flame stabilizer, wherein the flame stabilizer comprises an outer ring, a center body, a plurality of struts extending from the outer ring to the center body, wherein the center body comprises a central passage extending from an upstream side to a downstream side of the center body, the central passage extends through the center body, and the center body comprises an outer surface that expands in diameter in a downstream direction from the upstream side to the downstream side.