For natural gas combustion, these challenges have been met and initial engine demonstrations have successfully shown that
catalytic combustion is capable of driving a gas turbine engine and delivering ultra-low NOx
emissions. For other fuels, however, further
development and demonstration is required. For catalytic combustion of liquid fuels such as Diesel No. 2, development of an adequate
and robust prevaporizer technology is required to prevent wetting of the catalyst surface and to allow reaction of mixed, prevaporized
fuel and air on the catalyst surface. For solid fuels such as coal, gasification is required upstream of the catalyst, and there has been
growing interest in catalytic combustion of gasified coal or syngas.