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Istituto di ricerche sulla combustione
Soppresso il 01/10/2020

Torna all'elenco Contributi in rivista anno 2020

Contributo in rivista

Tipo: Articolo in rivista

Titolo: Effect of after-treatment systems on particulate matter emissions in diesel engine exhaust

Anno di pubblicazione: 2020

Formato: Elettronico Cartaceo

Autori: Barbara Apicella, Ezio Mancaruso, Carmela Russo, Antonio Tregrossi, Maria Maddalena Oliano, Anna Ciajolo, Bianca Maria Vaglieco

Affiliazioni autori: ---------

Autori CNR:

  • BARBARA APICELLA
  • ANNA CIAJOLO
  • EZIO MANCARUSO
  • MARIA MADDALENA OLIANO
  • CARMELA RUSSO
  • ANTONIO TREGROSSI
  • BIANCA MARIA VAGLIECO

Lingua: inglese

Abstract: Diesel engine exhausts from a common rail 3.0 L F1C diesel engine were analyzed at two different load conditions of the WLTC testing cycle downstream of both the diesel particulate filter (DPF) and selective catalytic reactor (SCR) to verify their effect on the characteristics of carbon particulate matter. An array of chemical, physical and spectroscopic techniques (gas chromatography coupled with mass spectrometry (GC-MS), mobility analyzer, UV-Visible absorption and fluorescence spectroscopy) was applied for characterizing polycyclic aromatic hydrocarbons (PAH), heavy aromatic compounds and soot, constituting the particulate matter (PM) sampled from the exhaust. The engine was operated in half load (HL) (188 Nm, representing the more common condition for engine in urban traffic) and full load (FL) (452 Nm, representing the best performance of the engine operation) conditions, at the same engine speed (2000 rpm). Soot formation was enhanced in HL condition, with respect to FL, but, just because of the much lower soot amount, the after-treatment systems in this last condition resulted to be less efficient in the soot abatement. Indeed, the abatement through DPF was about 40% lower in the FL condition with respect to HL condition, and any significant further concentration decrease was found after SCR, in both conditions. By contrast, PAH concentration after DPF abatement was found to be higher in the HL with respect to FL condition. A further PAH concentration decrease of about 30% was found after the SCR in the HL condition whereas in FL the reduction was only about 5-6%. Also the heavy aromatic compounds having molecular weight above the GC-MS detection limit (300 u), were mitigated by SCR. Therefore, SCR did not cause a further soot reduction, whereas it was effective in largely reducing PAH and heavy aromatics emissions, especially in the lower temperature condition featuring the half-load condition, when combustion efficiency is worse. Moreover, SCR system reduced the emission of small particles probably due to an enhanced agglomeration of particles, with beneficial effect on the harmfulness to human health.

Lingua abstract: inglese

Pagine totali: 8

Rivista:

Experimental thermal and fluid science Elsevier,
Paese di pubblicazione: Stati Uniti d'America
Lingua: inglese
ISSN: 0894-1777

Numero volume: 116

DOI: 10.1016/j.expthermflusci.2020.110107

Referee: Sė: Internazionale

Stato della pubblicazione: Published version

Parole chiave:

  • Diesel engine particulate emissions
  • After-treatment systems for engine exhausts
  • DPF
  • SCR
  • PAH
  • BaPeq
  • PM

Strutture CNR:

 
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