Effects of a Pt/Ce0.68Zr0.32O2 catalyst and NO2 on the kinetics of diesel soot oxidation from thermogravimetric analyses

Opportunities for ceria-based mixed oxides versus commercial platinum-based catalysts in the soot combustion reaction. Mechanistic implications

“…finely dispersed copper species onto ceria-zirconia support enhance catalytic activity towards NO oxidation to NO 2 that contributes to soot combustion process, as reported in a previous paper [36]. On the other hand, results presented for platinum-based catalysts from the literature show an E a of 107 kJ/mol or higher (Table 4) [18,20].…”

“…Among the several catalysts used for soot combustion, the most common are: molten salts [14][15][16][17], Pt-based oxides [18][19][20][21], ceria-based oxides [18,19,[22][23][24][25][26][27][28], and others based on transition metals (such as copper or iron) [20,24,26,[29][30][31][32][33][34]. Although those catalysts containing Pt show a very high activity in the NO oxidation to NO 2 (and thus, promoting soot combustion), some other catalysts are being developed, whose NO 2 production activities are becoming closer to those of Pt-based catalysts, but with lower costs.…”

Role of Electronic Factor in Soot Oxidation Process Over Tunnelled and Layered Potassium Iron Oxide Catalysts

“…A large number of catalytic formulations, including single and mixed transition metal oxides, perovskite-and spinel-type oxides, and low melting point compounds, have been tested for the catalytic combustion of diesel soot [4][5][6][7]. Despite of the progress made, the reaction mechanism for this process has been scarcely addressed and therefore a lot of work is still needed in order to understand and advance a rational catalyst design.…”

Structured Catalysts for Soot Combustion for Diesel Engines

“…There are numerous articles reporting the use of precious metals supported on Al2O3, Ce-Zr mixed oxide [21], CeO2 and TiO2 [18] for this application, although the cost of these metals is really high. For this reason, other bulk catalysts have been extensively studied in the last decade such as hydrotalcite-like compounds (CuMgAl [22] and MnxMg3-xAlO [23]), spinels (ZnAl2O4 [24] and CoAl2O4 [25]), perovskites (LaMnO3 [26], La1−xKxCo1−yNiyO3−δ [27], La0.9K0.1Co1−xFexO3−δ [28] and BaCoO3-y [29]), mixed oxides (La-Ce oxide, Nd-Ce oxide, Fe-Ce oxide, Cu-Ce oxide [30]) and single oxides (SrO, CeO2, Co3O4, La2O3 [31]).…”