Stability of Ba,K/CeO2 catalyst during diesel soot combustion: Effect of temperature, water, and sulfur dioxide

Peralta, Marcela; Milt, Viviana Guadalupe; Cornaglia, Laura María; Querini, C.A.

doi:10.1016/j.jcat.2006.05.025

Cited by 122 publications

(87 citation statements)

References 43 publications

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“…According to the catalysts screening compiled in Figure 3, ceria-base catalysts are among the most effective for soot combustion, and this has promoted an intense research activity during the last years on different ceria-based catalysts for Diesel soot combustion like, among others, ceria doped with Zr [25,[35][36][37][38], Fe [36,39], La [21,36,38], Pr [21,36], Sm [21,36], Tb [36], Cu [40][41][42], Mn [40,43], and Mo [44] and different compounds supported on ceria such as K/Ceria [34,45], Co/Ceria [45][46][47][48][49], Ba,K/Ceria [50,51], Cu-V/Ceria [52], Ag/Ceria [53,54] or Cu/Ceria [55].…”

Section: -Why Ceria Catalysts For Soot Combustion?mentioning

confidence: 99%

Diesel soot combustion ceria catalysts

Bueno‐López

2014

Applied Catalysis B: Environmental

395

243

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This review article summarizes the contents of the keynote lecture with the same tittle presented at the 7 th edition of the International Conference on Environmental Catalysis hold in Lyon (France) in September 2012. Different aspects of the ceria-catalyzed Diesel soot combustion reactions have been critically discussed, such as the high catalytic activity of ceria for Diesel soot combustion in comparison to some other potential catalysts, the potential ceria-catalyzed Diesel soot combustion mechanisms (the so-called NO 2 -assisted mechanism and the active oxygen mechanism) and the effect of ceria doping with suitable cations like those of Pr, La or Zr. Ceria must be doped in order to enhance thermal stability, but ceria doping also changes different physicochemical and catalytic properties of ceria. Zr-doping, for instance, has a double role on ceria as soot combustion catalyst: enhances ceria oxidation capacity of the adsorbed NOx species (positive effect) but stabilizes NO 2 on surface (negative effect). The surface properties of a ceria catalyst are usually more important than those of bulk: high surface area/small crystal size usually has a positive effect on the catalyst performance and, in mixed oxides, the surface composition also plays a role. The optimal dopant loading depends on the foreign cation being, for instance, around 5-10%, 20-30% and 50 mole % for La 3+ , Zr 4+ , and Pr 3+ / 4+ , respectively.Keywords: DPF regeneration; soot; ceria; doped-ceria; Diesel engine contamination. 2This review article summarizes the contents of the keynote lecture with the same tittle presented at the 7 th edition of the International Conference on Environmental Catalysis hold in Lyon (France) in September 2012. 1.-The problem.Soot particles are formed as undesired by-products in combustion process, being one of the main pollutants emitted by Diesel engines together with NOx, CO and unburned hydrocarbons [1]. Typical gas exhaust composition of a Diesel car, which is summarized in Table 1, is 30-80 ppm hydrocarbons, 200-1500 ppm CO, 300-1650 ppm NO (~ 0 ppm NO 2 ), 5-18% O 2 , > 2% H 2 O and > 2% CO 2 .Soot particles consist of a carbon nucleus with some inorganic material and adsorbed hydrocarbons, SO x , and water [2]. Figure 1 shows TEM images of a real soot sample. The single particles of few nanometers present an amorphous core surrounded by a graphitic shell, and such single particles agglomerate in larger entities with size typically in the range 0.1-10 µm [3].Several adverse effects on health have been attributed to soot. A fraction of these particles (the so-called PM-10, with size smaller than 10 m) can penetrate the respiratory tract and are deposited on lungs increasing cancer risk, asthma and bronchitis. The adsorbed hydrocarbons are mutagenic substances and SO x in contact with water form strong acid compounds.Diesel particle traps with different designs can be used for soot removal from gas streams, wall-flow monoliths being the most popular [3,4]. Figure 2 shows a commercial SiC Diesel Part...

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Section: -Why Ceria Catalysts For Soot Combustion?mentioning

confidence: 99%

Diesel soot combustion ceria catalysts

Bueno‐López

2014

Applied Catalysis B: Environmental

395

243

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“…29) Another band exhibiting maximum frequency in the range from 1250 to 1310 cm -1 may be assigned to molecular SO2 species having bridging and chelating coordination, which were reported to form when CeO2 was exposed to SO2 below 200°C. 22),29) Similar bands observed for Ag/CeO2(LSA) were much less intense, but the presence of molecular SO2 (~1300 cm -1 ) is more obvious. By contrast, a weak band at 1135 cm -1 for Ag/ BaCeO3 is likely due to the formation of small amounts of bulk sulfate.…”

Section: )21)mentioning

confidence: 65%

Catalytic soot oxidation by Ag/BaCeO<sub>3</sub> having tolerance to SO<sub>2</sub> poisoning

Ikeue

Kobayashi

Machida

2009

J. Ceram. Soc. Japan

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The effect of SO2 and NO on the catalytic oxidation of diesel particulate (soot) was studied over two Ce oxides, CeO2 and BaCeO3. Silver catalysts loaded on both Ce oxides exhibited the high activity, which was accelerated by the pretreatment in a flow of NO/O2 mixtures. The adsorption species in the form of NO2/NO3 should play a role of oxidizing agents for soot. However, the pretreatment of Ag/CeO2 in a flow of SO2/O2 mixtures caused significant deactivation. Strong adsorption of SO2 onto active site at the three-phase boundary between soot, Ag/CeO2 and the gas phase would be a reason for the deactivation. Ag/ BaCeO3 was found to be a catalyst having much improved tolerance to SO2. The tolerance may be explained by the SO2 adsorption site residing apart from the catalytically active oxygen site.

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“…BaO) from sulfur poisoning (Peralta et al, 2006). The sulfur resistance and thermal resistance of CeO 2 and Al 2 O 3 as the supports was compared (Kwak et al, 2008).…”

Section: Other Metal Oxide Supportsmentioning

confidence: 99%

“…Nowadays, the NO x exhaust after treatment systems include: (i) exhaust gas recirculation (EGR), (ii) selective catalytic reduction (SCR) utilizing anhydrous ammonia or aqueous urea injection, (iii) direct decomposition of NO, (vi) steady-state selective catalytic reduction with hydrocarbons (HC-SCR) under lean conditions, (v) periodic HC-SCR using a NO x storage and reduction (NSR) catalysts (Kabin et al, 2004). Among them, the NO x storage/reduction (NSR) technology is currently regarded as a commercially viable solution for the control of NO x Fig.…”

Section: Introductionmentioning

confidence: 99%

“…The average initial NO x storage/reduction for the Pt (1.0 wt.%) / Al 2 O 3 catalyst was 0.0011 mmol NO x compared to 0.0377 mmol NO x obtained for the Pt (1.0 wt.%) / Ba (15.0 wt.%) / Al 2 O 3 , by using C 2 H 4 as the reducing agent (0.0176 mmol NO x for reaction conditions containing CO). In similar line, the performance of a model Pt (2.2 wt.%) / Ba (16.3 wt.%) / Al 2 O 3 washcoat monolith catalysts for NO x storage and reduction was analyzed (Kabin et al, 2004). Authors determined the reductant (C 3 H 6 ) feed protocol needed to achieve high efficiency of the NO x removal.…”

Section: Introductionmentioning

confidence: 99%

See 1 more Smart Citation

A short review about NOx storage-reduction catalysts based on metal oxides and hydrotalcite-type anionic clays

Jabłońska¹,

Palomares

Węgrzyn³

et al. 2013

Acta Geodynamica Et Geomaterialia

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The increasing problem of atmospheric pollution by NO x has resulted in stricter regulations on their emissions. NO x storage/reduction (NSR) is considered as efficient catalytic technology to abate lean-burn NO x . A wide variety of catalysts have been extensively examined for this purpose. The use of metal oxides, hydrotalcites and their derivatives as NO x storage/reduction catalysts has been reviewed. Suitable combination particularly the catalytic redox component and the storage component can lead to improved activity in NO x decomposition and capturing under the lean-rich conditions. ARTICLE INFO

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Stability of Ba,K/CeO2 catalyst during diesel soot combustion: Effect of temperature, water, and sulfur dioxide

Cited by 122 publications

References 43 publications

Diesel soot combustion ceria catalysts

Diesel soot combustion ceria catalysts

Catalytic soot oxidation by Ag/BaCeO<sub>3</sub> having tolerance to SO<sub>2</sub> poisoning

A short review about NOx storage-reduction catalysts based on metal oxides and hydrotalcite-type anionic clays

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