We report results from a lean burn ultra-low emission catalytic combustor. In a sub-scale rig, atmospheric testing with methane demonstrated NOx<3, CO<5, and UHC<1 ppm, with stable combustion at inlet temperatures of 400-500 degrees C (750-1020 degrees F) and combustor discharge temperatures of 1150-1540 degrees C (2100-2800 degrees F). Catalyst temperatures were held well-below metal substrate material limits, while combustor discharge temperatures of up to 1540 degrees C (2800 degrees F) were achieved.