Simultaneous removal of soot and nitrogen oxides from diesel engine exhausts

Pisarello, María Laura; Milt, Viviana Guadalupe; Peralta, Marcela; Querini, C.A.; Miró, Eduardo Ernesto

doi:10.1016/s0920-5861(02)00097-4

Cited by 136 publications

(52 citation statements)

References 8 publications

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“…The same phenomenon was previously observed for a CeO 2 catalyst [21]. Related with this fact, Pisarello et al [22] also concluded that the formation of stable nitrate species on a K/Ba/CeO 2 catalyst inhibits the soot combustion reaction.…”

Section: No X Removalsupporting

confidence: 75%

Cu/Al2O3 catalysts for soot oxidation: Copper loading effect

López-Suárez

Bueno‐López

Illán-Gómez

2008

Applied Catalysis B: Environmental

173

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Cu/Al 2 O 3 catalysts with metal loading from 0.64 to 8.8 wt. % have been prepared and characterised by different techniques: N 2 adsorption at -196ºC (BET surface area), ICP (Cu loading), XRD, selective copper surface oxidation with N 2 O (Cu dispersion), TPR-H 2 (redox properties), and XPS (copper surface species). The catalytic activity for soot oxidation has been tested both in air and NOx/O 2 . The activity in air depends on the amount of easily-reduced Cu(II) species, which are reduced around 275ºC under TPR-H 2 conditions. The amount of the most active Cu(II) species increases with the copper loading from Cu_1% to Cu_5% and remains almost constant for higher copper loading.In the presence of NOx, the first step of the mechanism is NO oxidation to NO 2 , and the catalytic activity for this reaction depends on the copper loading. For catalysts with copper loading between Cu_1% and Cu_5%, the catalytic activity for soot oxidation in the presence of NOx depends on NO 2 formation. For catalysts with higher copper loading this trend is not followed because of the low reactivity of model soot at the temperature of maximum NO 2 production. Regardless the copper loading, all the catalysts improve the selectivity towards CO 2 formation as soot oxidation product both under air and NOx/O 2 .

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Section: No X Removalsupporting

confidence: 75%

Cu/Al2O3 catalysts for soot oxidation: Copper loading effect

López-Suárez

Bueno‐López

Illán-Gómez

2008

Applied Catalysis B: Environmental

173

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“…The addition of Cu and Fe results in a beneficial effect on soot combustion compared to bare supports, while the introduction of Sr has a detrimental influence on the performances. The fact that Sr acts as an efficient NO x trap [52,71,72], with the formation of stable nitrates species, is likely to cause a loss of soot combustion activity, in agreement with previous literature results [15].…”

Section: Catalytic Testssupporting

confidence: 92%

“…Alkaline-earth metals can promote soot combustion activity, working either as oxidation catalysts or NO x storage traps [51][52][53][54]. Indeed, on alkaline-earth metal NO x storage occurs suggesting their use as a promising component in LNT (lean NO x trap) applications where NO x is stored during the lean phase and then it is reduced in the rich interval.…”

Section: Introductionmentioning

confidence: 99%

The Effect of Sr Addition in Cu- and Fe-Modified CeO2 and ZrO2 Soot Combustion Catalysts

Rico-Pérez¹,

Aneggi²,

Trovarelli³

2017

Catalysts

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This study investigates the activity of transition and alkaline-earth metal-doped catalysts supported on ceria or zirconia for the NO x -assisted oxidation of diesel particulate. A series of Cu-and Fe-impregnated catalysts over CeO 2 and ZrO 2 supports were prepared by incipient wetness impregnation and characterized by BET, X-ray diffraction (XRD), and temperature-programmed reduction (TPR) experiments while their catalytic activity was investigated in NO x -assisted reaction by means of temperature programmed oxidation experiments (TPO). Higher activity was achieved by copper modified catalysts; the addition of Sr positively affected the performance of the materials, suggesting a synergic effect between transition metals and alkaline-earth metal. The role of copper is correlated to the oxidation of NO to NO 2 , while strontium seems to be mainly involved in the storage of NO x species.

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“…Ceria-based materials are major compounds of the rare earth family, and these have been extensively studied and found application as ultraviolet absorbers (Masui et al, 1997(Masui et al, , 2000, solid electrolytes (Inaba & Tagawa, 1996), so-called three-way catalysts for automotive exhaust catalysts (Bekyarova et al, 1998), and soot oxidation catalysts (Pisarello et al, 2002;Aneggi et al, 2006). Nanocrystalline ceria materials have received much attention owing to their physical and chemical properties, which are markedly different from those of the bulk materials.…”

Section: Ceo 2 -Tio 2 Composite As a Catalystmentioning

confidence: 99%