| Summary: | Photo-thermo-catalytic or PTC purification of process gasses (i.e., air, flue gases, and others) from NO<sub>x</sub> is presented in this study. A discussion of temperature’s role in photocatalytic NO<sub>x</sub> removal and the progress of photo-thermo-catalytic reactors for the NO<sub>x</sub> removal process are presented. Lab- and pilot-scale reactors are described. The impact of temperature on the photocatalytic conversion of hydrocarbons is analyzed with regard to its relation to the photocatalytic selective reduction of NO<sub>x</sub> (photo-SCR). Another important issue is light transfer in pilot-scale reactors due to the sensitivity of light sources to temperature. Examples of light transfer solutions in photo-thermo-catalytic reactors are presented. Finally, the further development of photo-thermo-catalytic reactors is discussed, including pressurized systems.
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