Influence of platinum and rhodium composition on the NOx storage and sulphur tolerance of a barium based NOx storage catalyst

Amberntsson, Annika; Fridell, Erik; Skoglundh, Magnus

doi:10.1016/s0926-3373(03)00269-8

Cited by 70 publications

(54 citation statements)

References 45 publications

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“…The light-off temperature in the NO oxidation to NO 2 is significant for the low-temperature SCR of NO x reduction. Therefore the research into NO oxidation catalysts is important for the NO x removal and various catalysts have been researched, including the supported noble metals [3][4][5][6] and other metal oxides [7][8][9].…”

Section: Introductionmentioning

confidence: 99%

Characterization and Catalytic Activity of Mn-Co/TiO2 Catalysts for NO Oxidation to NO2 at Low Temperature

et al. 2016

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Abstract:A series of Mn-Co/TiO 2 catalysts were prepared by wet impregnation method and evaluated for the oxidation of NO to NO 2 . The effects of Co amounts and calcination temperature on NO oxidation were investigated in detail. The catalytic oxidation ability in the temperature range of 403-473 K was obviously improved by doping cobalt into Mn/TiO 2 . These samples were characterized by nitrogen adsorption-desorption, X-ray diffraction (XRD), X-ray photoelectron spectroscopy (XPS), transmission electron microscope (TEM) and hydrogen temperature programmed reduction (H 2 -TPR). The results indicated that the formation of dispersed Co 3 O 4¨C oMnO 3 mixed oxides through synergistic interaction between Mn-O and Co-O was directly responsible for the enhanced activities towards NO oxidation at low temperatures. Doping of Co enhanced Mn 4+ formation and increased chemical adsorbed oxygen amounts, which also accelerated NO oxidation.

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Section: Introductionmentioning

confidence: 99%

Characterization and Catalytic Activity of Mn-Co/TiO2 Catalysts for NO Oxidation to NO2 at Low Temperature

et al. 2016

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“…For Ba-containing catalysts, noble metal species and their dispersion can lead to different NO oxidation activity during the lean phase [8,14,15] thus directly influencing subsequent adsorption on Ba sites. Additionally, as a result of different preparation methods and reaction conditions, Ba can be present in the form of BaO, Ba(OH) 2 , or BaCO 3 , with NO x adsorption ability showing a decreased order [9].…”

Section: Introductionmentioning

confidence: 99%

Effect of Co addition to Pt/Ba/Al2O3 system for NOx storage and reduction

Wang

2010

Applied Catalysis B: Environmental

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a b s t r a c tA comparative study of Pt/Ba/Al 2 O 3 , Co/Ba/Al 2 O 3 , Pt/Co/Al 2 O 3 and Pt/Co/Ba/Al 2 O 3 was performed in regards to their NO x storage capacities and NO oxidation abilities as a function of temperature. The nitrate stability and dynamic behaviors of NO x storage reduction during lean/rich fuel cycles using hydrogen as a reductant were also investigated over these catalysts. It was found that Pt/Co/Ba/Al 2 O 3 possessed the largest NO x storage capacity within the temperature range of 200-350 • C. The existence of Co not only improved the oxidation of NO to NO 2 under lean conditions, but also enhanced the release and reduction of NO x during the rich phase. The Pt and Co co-supported catalysts showed better NO x storage reduction activity and higher N 2 selectivity than Pt supported Ba/Al 2 O 3 catalysts within the tested temperature range. As for Pt/Co/Ba/Al 2 O 3 , high conversion was obtained at either a low reductant concentration with long duration time or a high reductant concentration with short duration time during the rich phase. In situ FTIR studies showed that NO x adsorption over Co-containing catalysts takes "nitrite route" as an important pathway. The intimate contact of Co and Ba/Al could accelerate nitrite/nitrate formation and the synergistic effect of Pt and Co could accelerate NO x reduction.

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“…In the early literature the Pt/Ba/Al 2 O 3 system was studied to optimize the composition of the catalyst (Lietti et al, 2001;Amberntsson et al, 2003 (Amberntsson et al, 2002;Amberntsson et al, 2003 …”

Section: Metal Oxide Supportsmentioning

confidence: 99%

“…The main reason is very poor sulphur tolerance Amberntsson et al, 2003;Efthimiadis et al, 1999). Sulfur poisons the key components of the NSR catalysts (Pt or BaO).…”

Section: Other Metal Oxide Supportsmentioning

confidence: 99%

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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Influence of platinum and rhodium composition on the NOx storage and sulphur tolerance of a barium based NOx storage catalyst

Cited by 70 publications

References 45 publications

Characterization and Catalytic Activity of Mn-Co/TiO2 Catalysts for NO Oxidation to NO2 at Low Temperature

Characterization and Catalytic Activity of Mn-Co/TiO2 Catalysts for NO Oxidation to NO2 at Low Temperature

Effect of Co addition to Pt/Ba/Al2O3 system for NOx storage and reduction

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

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