Catalytic Effects of Metallic Fuel Additives on Oxidation Characteristics of Trapped Diesel Soot

Investigation on Particulate Oxidation from a DI Diesel Engine Fueled with Three Fuels

“…For diesel soot, the following reported lower activation energy than those obtained in this study : Jung et al (2005) with 25 ppm cerium-dosed case (line a, 107 kJ/mol); Jung et al (2003) with lube-oil-dosed case (line b, 101 kJ/mol); Higgins et al (2003) with regular diesel fuel (line e, 108 kJ/mol); Ahlström and Odenbrand (1989) with flow reactor study of diesel particles (line h, 106 kJ/mol). On the other hand, Miyamoto et al (1988) obtained higher results using TGA for uncatalyzed diesel soot (line f, 191 kJ/mol) and the following two obtained similar results: Higgins et al (2002) using diffusing flame-generated soot (line d, 164 kJ/mol) and Otto et al (1980) using TGA for diesel particles (142 kJ/mol). Clearly, the activation energy depends on the type of fuel, the treatment of the fuel or the soot, and the methods of measurement.…”

“…From top to bottom: (A) biodiesel particle collected at 0.08 MPa; (B) LSD particle collected at 0.08 MPa; (C) ULSD particle collected at 0.08 MPa; (D) biodiesel particle collected at 0.7 MPa; (E) LSD particle collected at 0.7 MPa; (F) ULSD particle collected at 0.7 MPa. Thin lines show previous works: (a) Jung et al (2005), 25 ppm cerium-dosed case (107 kJ/mol); (b) Jung et al (2003), lube-oil-dosed case (101 kJ/mol); (c) Jung et al (2006), pure biodiesel (89 kJ/mol); (d) Higgins et al (2002) using diffusion flame-generated soot (164 kJ/mol); (e) Higgins et al (2003), diesel particles with regular diesel fuel (108 kJ/mol); (f) Miyamoto et al (1988) TGA of uncatalyzed diesel soot (191 kJ/mol); (g) Otto et al (1980) TGA of diesel particles (142 ± 21 kJ/mol); (h) Ahlström and Odenbrand (1989) particulate agglomerates (Strzelec et al 2011). The larger specific surface area improves the exposure of the particles to oxygen in the oxidation process, leading to the higher oxidative reactivity of biodiesel particles, compared with the ULSD and LSD particles.…”

Oxidation behavior of a kind of carbon black

“…The soot oxidation, which is necessary for DPF regeneration, is a function of the kinetic parameters, the oxygen partial pressure 2 O ,0 ( ) p and the soot conversion model [1] . Kinetic parameters of the soot oxidation have been extensively studied with the activation energy found to cover a range of 102 and 210 kJ/mol [1][2][3][4][5] . The oxidation rate of soot is usually expressed as being proportional to 2 O ,0 .…”

Catalytic combustion of soot

“…As the combustion temperature of the soot is much higher than the operational temperature in the exhaust pipe, either the temperature in the exhaust pipe must be increased or the combustion temperature of the soot must be decreased. The latter can be lowered by the addition of an oxidation catalyst in the form of fuel additives [1], by spraying a metal salt solution on the accumulated soot [2] or by impregnation of the filter walls with an oxidation catalyst [3]. For the last option, supported metal oxides are considered to be the most promising candidates.…”

“…Several investigators have reported results of their studies on application of oxides to lower the oxidation temperature of soot. Reported active soot oxidation catalysts are Cu/K/Mo/C1, CuO, Cu/V/K [1,5,6] ternary AB2041 spinel-type oxides [7], copper vanadates [8] and perovskites [9].…”