The performance of a number of fuel-borne metal catalysts on the operation of DPFs was testet under a specific test protocol. The tests comprised regeneration attempts at steady state speeds, uder various engine operating conditions, following a trap loading phase for about 100 km. Methylcyclopentadienyl Manganese Tricarbonyl (MMT) was found to be the most effective of the additives tested. It was the only additive that clearly led to trap partial regeneration under normal engine conditions at a metal molar concentration of 0.604 mmol/l. Indications for partial oxidation during normal engine operation were also obtained with lower MMT concentrations (0.304 mmol/l), as well as with ferrocene, but a nearly linear dependence on metal concentration. Nearly all additives produce the same regeneration onset temeprature at low concentrations, while at higher concentrations MMT was found to be more effective. MMT tested at very low concentration (0.122 mmol/l) gave burn-off temperature similar to those of Ce-based additive tested at the same concentration (0.121 mmol/l). Similar results were also produced by the commercially available Eolys Ce-based FBC at 0.150 mmol/l. Regeneration onset temperature data were also confirmed by TGA experiments, indicating that this method can be used successfully for a fast pre-screening of catalytic additives, before full-scale engine experiments. On the basis of the measurements conducted in this study it can be deduced that burn-off temperature directly depends on the additive concentration, while regeneration rate is a function of the particulate loading on the filter and hence the pressure drop across the filter.


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    Titel :

    Evaluation of metal based fuel-borne catalysts for diesel particulate filter regeneration


    Weitere Titelangaben:

    Auswertung von Katalysatoren auf Metallbasis, die zwecks Regenerierung von Dieselpartikelfiltern dem Kraftstoff beigemischt werden


    Beteiligte:

    Erschienen in:

    Erscheinungsdatum :

    2008


    Format / Umfang :

    15 Seiten, 11 Bilder, 4 Tabellen, 18 Quellen




    Medientyp :

    Aufsatz (Zeitschrift)


    Format :

    Print


    Sprache :

    Englisch





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