fig2

Figure 2. Advances in synergistic catalytic conversion of NO_x and different VOCs on typical catalysts with optimized performance. (A) NO_x reduction with CB oxidation at 300 °C over typical V-Ti-based^[23-26], Mn-Ce-based^{[10,11,22,27,30,31]}, and novel catalysts^[32-36]; (B) NO_x reduction with toluene oxidation at 250 °C over V-Ti-based^[46-49], Mn-Ce-based^[51-55], and other optimized CeO₂-based catalysts^[56-59]; (C) NO_x reduction with other VOCs in typical catalysts with optimal synergistic catalytic performance under proper conditions^[60-68]. NO_x: Nitrogen oxides; VOCs: volatile organic compounds; CB: chlorobenzene; TNT: TiO₂ nanotubes; HZSM5: hydrogen form of zeolite Socony Mobil-5; LDO: layered double hydroxide.