Marco Piumetti

TL;DR: In this paper, three mesoporous manganese oxide catalysts (Mn 2 O 3, Mn 3 O 4 and Mn x O y ) have been prepared, by means of the solution combustion synthesis, and tested for the total oxidation of volatile organic compounds (VOCs; ethylene, propylene, toluene and their mixture).

TL;DR: A critical review of recent advances in modeling approaches has also been presented in this article, where the authors highlight the main factors that affect the activity of powder catalysts and the kinetic soot oxidation models have been examined.

Abstract: A set of ceria nanomaterials with different topological and textural properties has been prepared to investigate the shape-dependency activity of ceria towards soot combustion under different reaction conditions (namely in “loose” and “tight” contact). The physico-chemical properties of the prepared catalysts have been studied using complementary techniques. The best performances, in terms of the total oxidation of soot, have been achieved for the CeO 2 -nanocubes, due to the abundance of coordinative unsaturated atomic sites on the (1 0 0) and (1 1 0) exposed surfaces (namely truncated nanocubes). However, better results, in terms of the onset of soot oxidation, have been obtained for high-surface-area materials, thus reflecting the key role of surface area at low temperatures. Activity tests have suggested the surface-sensitivity of soot oxidation over the prepared ceria-based materials, when the reaction temperature was above 410 °C or 370 °C (in “loose” or “tight” conditions, respectively). On the other hand, the reaction has appeared surface-insensitive at a lower temperature. Hence, soot oxidation over these ceria compounds can be considered a reaction that displays both surface-sensitive and surface-insensitive behaviour, which depend on the experimental conditions.

TL;DR: In this article, a set of nanostructured ceria-zirconia catalysts with different Zr-contents and structural features has been prepared to study the effect of both the ZR-amount and its surface-dependent activity towards soot combustion under different experimental conditions (namely in loose and tight soot-catalyst contact).

TL;DR: In this article, the effect of Pr as a dopant and morphology of nanocubes and nanorods on soot combustion performance was investigated under both loose and tight soot-TPR conditions.