Table 6.
Operative conditions and soot-removal efficiency via NTP technology.
| Catalyst Formulation (Particle Size [nm]) |
NTP Technology | Operative Conditions | Soot-Removal Efficiency [g·kWh−1] (Maximum Value Reached) |
Reference |
|---|---|---|---|---|
| Fe2O3 (14.6) MnOx (168.1) Co3O4 (53.3) |
Corona plasma reactor | 0–20 kV, 4–7.5 W 300 sccm of feed gas containing 10% O2 in N2 Electrode surface coated with 3.5 mg of soot Residence time: 0.94 s 1 atm, 180–350 °C |
7.0 with MnOx |
[102] |
| Au, Pt, Pd and Ag (not specified) |
DBD | 5–6 kV, 4.5 W Reacting flow rate: 1 L min−1 20% O2 20 mg of PM dispersed in 2 mL of liquid ethanol, uniformly loaded on the alumina plate surface t = 1 h 1 atm, 100–250 °C |
6.1 with Au | [104] |
| AgCe–C (Ag crystallite size < 3 nm, CeO2 crystallite size = 25.1 nm) AgCe–R (Ag crystallite size < 3 nm, CeO2 crystallite size = 14.8 nm) |
O3 activation | O3/air flow = 1 L/min O3 concentration of 400 ppm T = 200 °C |
Not specified | [105] |
| MgSO4 K2SO4 CaSO4·2H2O (not specified) |
DBD | 7.4–8 kV, 4.5 W 800 mL·min−1 of N2 200 mL·min−1 of O2 10 mg of PM dispersed in 1-mL aqueous ethanol, mixed with a 500-μL aqueous solution of metal sulfate T = 100–250 °C |
3.8 with K2SO4 | [106] |
| Ag/α-Al2O3 (not specified) |
DBD | Reacting flow rate: 2 L min−1 300 ppm of NO 265 ppm of n-heptane 48 ppm of naphthalene (soot simulant) 10% O2 3.7% H2O N2 as balance gas T = 150–350 °C |
Not specified | [107] |