Competitive reaction pathway for photo and thermal catalytic removal of NO with hydrocarbon in flue gas under elevated temperatures

Abstract Three types of photocatalytic NO removal reaction including photo-assisted selective catalytic reduction (photo-SCR), photo-oxidation and photo-decomposition, were designated in the flue gas under elevated temperatures. The reliability of reaction pathways is supported by the excellent agreement of the change in the thermodynamic properties of individual catalytic reactions. The presence of O 2 could further effectively improve the photocatalytic activity at the low reaction temperature. However, an excess consumption of both O 2 and C 4 H 10 was recognized by oxidation of C 4 H 10 at the higher reaction temperature, resulting in the drop of the NO removal. This study provides the basis for designing the photocatalytic removal of NO with a hydrocarbon in the flue gas.