The Development and In-Field Performance of Highly Durable Particulate Control Systems

Allansson, Ronny; Goersmann, C.; Lavenius, Mats; Phillips, P. J.; Uusimäki, Ari; Walker, Andy

doi:10.4271/2004-01-0072

Cited by 20 publications

(14 citation statements)

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“…However, the onset temperature of soot oxidation is not influenced. The influence of the catalysts in the loose contact mode is very limited, which is in agreement with previous studies [3][4][5][6][7][8]. Among the materials examined in loose contact mode, CePrO x _1000 is found to have better activity.…”

Section: Xrdsupporting

confidence: 79%

“…The large volume diesel engine market and its ever increasing demand in the heavy-duty engine sector, which emits large amounts of soot particulate matter, are of the concern and aftertreatment devices such as particulate traps are necessary [3][4][5][6][7]. Un-catalysed soot (carbon particles) oxidation to CO 2 with a typical diesel engine exhaust gas (having H 2 O, NO x , hydrocarbons (HC), CO and SO 2 ) occurs generally around 600°C [3][4][5][6][7]. When the diesel engine is fitted with an un-catalysed trap frequently high temperature regenerations are required, which can be uncontrolled, inefficient, and inconvenient.…”

Section: Introductionmentioning

confidence: 99%

“…To overcome the contact problem catalysts, that work on different principles, have been developed [3][4][5][6][7][8]. The use of the fuel-borne catalysts incorporates a catalyst within the soot particle and increases the number of contact points and, therefore, decreases soot oxidation temperature significantly, from 600 to 350°C.…”

Section: Introductionmentioning

confidence: 99%

“…CeO 2 is used as a wellknown three-way catalyst for CO, HC, and NO x abatement, as fuel-born catalyst, and in catalysed soot filters in eliminating soot particulates [3][4][5][6][7][8][9]. Fuel-born ceria catalyst leads to the uniform formation of CeO 2 nano-particles trapped within soot particle.…”

Section: Introductionmentioning

confidence: 99%

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Potential rare-earth modified CeO2 catalysts for soot oxidation

Kamasamudram

Bueno‐López

Makkee

et al. 2007

Applied Catalysis B: Environmental

110

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The physico-chemical properties of ceria (CeO 2 ) and rare earth modified ceria (with La, Pr, Sm, Y) catalysts are studied and correlated with the soot oxidation activity with using O 2 and O 2 +NO. CeO 2 modified with La and Pr shows superior soot oxidation activity with O 2 compared with the unmodified catalyst. The improved soot oxidation activity of rare earth doped CeO 2 catalysts can be correlated to the increased meso/micro pore volume and the stabilisation of the external surface area. On the other hand, unreducible ions decrease the intrinsic soot oxidation activity of rare earth modified ceria with both O 2 and NO+O 2 due to the decreased amount of redox surface sites. The catalyst bulk oxygen storage capacity is not a critical parameter in determining the soot oxidation activity. The modification with Pr shows the best soot oxidation with both O 2 and O 2 +NO compared with all other catalysts.

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Section: Xrdsupporting

confidence: 79%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

See 2 more Smart Citations

Potential rare-earth modified CeO2 catalysts for soot oxidation

Kamasamudram

Bueno‐López

Makkee

et al. 2007

Applied Catalysis B: Environmental

110

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“…From energy considerations and system design, an ideal particulate removal unit would minimise the temperature for continuous or induced regeneration of the soot filter. The two most popular technologies to decrease the soot oxidation temperature and, thereby, the energy requirement are: (i) catalysed soot filter that converts NO to NO 2 which in turn oxidises soot [3], and (ii) fuelborne catalyst (FBC), that oxidises the soot mainly with O 2 as well as to some extent with NO [4]. The soot oxidation with oxygen is insignificant in a catalysed soot filter; this mainly arises due to from the poor contact between the catalyst and the soot [5].…”

Section: Introductionmentioning

confidence: 99%

Pt–Ce-soot generated from fuel-borne catalysts: soot oxidation mechanism

Kamasamudram

Makkee

2007

Top Catal

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Soot containing Ce-, Pt-, Pt-Ce-, Fe-, and Cu-fuel-borne catalysts is generated in a diesel engine, is characterised by XRD, and studied in oxidation with O 2 and NO + O 2 under various reaction conditions. Fe-, Pt-Ce-and Ce-soot are oxidised at lower temperature with O 2 , compared with Pt-soot, and the opposite trend is observed with NO + O 2 . NO is oxidised to NO 2 more efficiently over Pt-soot and decreased the soot oxidation temperature by about 150°C, compared with Ce-, Fe-or Pt-Ce-soot. On the other hand, NO 2 is most efficiently utilised over the Pt-Ce-and Ce-soot. The soot oxidation under the different feed gas conditions demonstrates that nitrate species are involved in the oxidation of Ce-and Pt-Ce-soot. The oxidation species with the decreasing order of activity are: (1) nitrates, (2) NO 2 , (3) lattice oxygen, and (4) gas-phase oxygen. All the above species are involved in the oxidation of Pt-Ce-soot.

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