Potassium-promoted Ce0.65Zr0.35O2 monolithic catalysts for diesel soot combustion

Investigations into nanostructured ceria–zirconia catalysts for soot combustion

“…A study by Zhang et al [35] on ceria nanocubes, that exposed six (100) surfaces, revealed greater oxygen storage which can be attributed to the ease of O extraction from those surfaces. On the other hand, since the overall oxidation activity depends on the surface area available from the solid catalyst, it is necessary to maximize the dispersion of the nanoparticles using high-surface-area supports, such as zeolites [1,9].…”

“…0.005 g/Km for PM from passenger cars in Europe since 2009) and has imposed the use of catalytic technologies to satisfy the required standards [1,3]. Among the different alternatives, the entrapment of particulate from exhaust gases by Diesel particulate filters (DPFs) has received much interest in recent years [5][6][7][8][9][10]. The soot that forms Diesel exhaust particulate can be burnt off above 600 °C, whereas typical engine exhaust temperatures fall within the 200 to 500 °C range [8,9].…”

Efficient catalytic removal of diesel soot over Mg substituted K/La0.8Ce0.2CoO3 perovskites with large surface areas

“…The presence of alkali promoter, such as potassium, can evidently improve the soot oxidation activity of perovskite catalysts by improving the contact between the soot particles and the catalytic active sites [16]. Kim et al [17] have found that K 2 CO 3 supported on perovskite oxide presented a good catalytic activity for soot combustion.…”

Catalytic regeneration of Diesel Particulate Filters: Comparison of Pt and CePr active phases

“…Most dopants studied are cations of d (Y [8], Zr [9][10][11][12][13], Hf [11], Nb [14], Mn [15], Ru [16], Zn [17], etc) and f (La [8,9,18,19], Pr [8,18,19], Nd [19,20], Sm [8,18], Gd [21], Tb [18], etc) elements, and the most promising doped-ceria active phases seem to be those with Pr, Zr or La as main dopant.…”