Impact of biodiesel impurities on carbon oxidation in passive regeneration conditions: Influence of the alkali metals
| Autor: | Valérie Tschamber, Alain Brillard, Gontrand Leyssens, Julie Schobing |
|---|---|
| Přispěvatelé: | Laboratoire de gestion des risques et environnement - LGRE - UR2334 (GRE), Université de Haute-Alsace (UHA) Mulhouse - Colmar (Université de Haute-Alsace (UHA)), ANR-14-CE22-0003,APPIBio,APPROCHE PLURIDISCIPLAIRE DE L'IMPACT DES BIOCARBURANTS SUR LES SYSTEMES DE POST-TRAITEMENTS DIESEL(2014) |
| Jazyk: | angličtina |
| Rok vydání: | 2017 |
| Předmět: |
Thermogravimetric analysis
Aqueous solution Process Chemistry and Technology Inorganic chemistry chemistry.chemical_element 02 engineering and technology Carbon black 010402 general chemistry 021001 nanoscience & nanotechnology Alkali metal 01 natural sciences complex mixtures Catalysis 0104 chemical sciences chemistry X-ray photoelectron spectroscopy 13. Climate action Specific surface area Oxidizing agent [SPI.GPROC]Engineering Sciences [physics]/Chemical and Process Engineering 0210 nano-technology Carbon General Environmental Science |
| Zdroj: | Applied Catalysis B: Environmental Applied Catalysis B: Environmental, Elsevier, 2017, 226, pp.596-607. ⟨10.1016/j.apcatb.2017.12.011⟩ |
| ISSN: | 0926-3373 |
| Popis: | 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. |
| Databáze: | OpenAIRE |
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