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Technical Paper

DPF Supporting Nano-Structured Perovskite Catalysts for NOx and Diesel Soot Emission Control in Commercial Vehicles

Nano-structured perovskite-type oxides catalysts La1-xAxFe1-yByO3 (where A = Na, K, Rb and B = Cu), prepared by the Solution Combustion Synthesis (SCS) method and characterized by BET, XRD, FESEM, AAS and catalytic activity tests in microreactors and engine bench, proved to be effective in the simultaneous removal of soot and NO, the two prevalent pollutants in diesel exhaust gases in the temperature range 350-450°C. The best compromise between soot and nitrogen oxide abatement was shown by La-K-Cu-FeO3 catalyst which displayed the highest catalytic activity towards carbon combustion and the highest NO conversion activity.
Technical Paper

Diesel Emissions Abatement Via Wall-Flow Traps Based on La0.8Cr0.8Li0.2O3 Catalyst

Nano-structured bulk Li-substituted La-Cr perovskites were prepared, characterized, tested in comparison with the reference LaCrO3. The progressive increase in the Li content of the catalysts induces an increase in the catalytic activity owing to the enhancement of the amount of weakly chemisorbed oxygen O-species, key players in the soot oxidation mechanism. However, beyond 20% Cr substitution with Li, part of this latter metal was segregated as LiCrO2. The best single-phase catalyst (La0.8Cr0.8Li0.2O3) was already active well below 350°C. Catalytic traps were prepared by in situ combustion synthesis within cordierite and SiC wall-flow filters on the basis of the above catalysts and tested on real diesel exhaust gases in an engine bench, fully confirming the encouraging results obtained on powder catalysts.