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- W2774804962 abstract "Soot model (Carbon Black (CB)) were impregnated by Na, K or P in aqueous solution, to simulate the poisoning process of soot by biodiesel impurities. Oxidation of non-doped and doped CB samples was performed under Temperature Programmed Oxidation (TPO) and under different oxidizing atmospheres containing NO2 to simulate passive regeneration conditions. Active regeneration conditions were tested through thermogravimetric analyses (TGA). Alkali metals exhibit a beneficial effect on the oxidation process through the whole temperature range, regardless the reactive gas flow. Phosphorus has a beneficial effect on C-NO2 reaction, particularly in presence of water, but inhibits the C-O2 reaction. Characterizations of the samples through elemental analysis, X-Ray Photoelectron Spectroscopy (XPS), nitrogen adsorption and Raman spectroscopy prove that alkali metals increase the specific surface area of CB samples and lead to a decrease in their internal structure order. Impregnation of CB samples by phosphorus leads to a decrease in specific surface area and to a greater organization of the carbon structure. The kinetic constants which are derived through numerical simulations prove that the higher reactivity of doped CB samples is linked to a decrease in activation energy of both C-NO2 and C-O2-NO2 reactions and an increase in the number of active sites." @default.
- W2774804962 created "2017-12-22" @default.
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- W2774804962 date "2018-06-01" @default.
- W2774804962 modified "2023-09-26" @default.
- W2774804962 title "Impact of biodiesel impurities on carbon oxidation in passive regeneration conditions: Influence of the alkali metals" @default.
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- W2774804962 doi "https://doi.org/10.1016/j.apcatb.2017.12.011" @default.
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