Noble metal free NO  storage catalysts using cobalt discovered via high-throughput experimentation

Vijay, R.; Hendershot, Reed J.; Rivera-Jiménez, Sindia M.; Rogers, W. Benjamin; Feist, Benjamin; Snively, Christopher M.; Lauterbach, Jochen A.

doi:10.1016/j.catcom.2004.12.004

Cited by 56 publications

(36 citation statements)

References 34 publications

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“…The low intensity of the peak indicates high dispersion of cobalt in the matrix. Although using the same Co content, the XRD patterns of Co/Ba-containing catalysts obtained here are quite different from what Vijay et al reported, which is a possible reflection of different preparation methods and precursors applied [27].…”

Section: Structural Propertiescontrasting

confidence: 87%

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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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Section: Structural Propertiescontrasting

confidence: 87%

“…Vijay et al found that Co exhibits a similar ability as Pt to oxidize NO during the lean phase [27,28], which clarifies the application of easy obtain and low-cost transition metals. Park et al further confirmed by XAFS measurement that the active phase of Co was as Co 3 O 4 [29].…”

Section: Introductionmentioning

confidence: 93%

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

Wang

2010

Applied Catalysis B: Environmental

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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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“…After reduction pretreatment (under pure hydrogen at 500 C for 1 h) of the Pt-Fe/Ba/Al 2 O 3 sample the NO x storage capacity slightly decreased (from 0.245 to 0.239 mmol/g). Positive effect of Fe (2.5 wt.%) addition to Pt (1.0 wt.%) / Ba (15.0 wt.%) / Al 2 O 3 or Ba (15.0 wt.%)/Al 2 O 3 catalysts on NO x storage/reduction efficiency was also investigated (Vijay et al, 2005). Additionally, the effect of Mn (2.5 wt.%) or Co (2.5 wt.%) addition to the catalysts was derived.…”

Section: Alkali/alkaline-earth Oxide -Doped Catalystsmentioning

confidence: 99%

“…Studies of the Co-based Pt/Ba/Al 2 O 3 system was also reported (Vijay et al, 2005). The Pt (1.0 wt.%) /Co (5.0 wt.%)/Ba (20.0 wt.%)/Al 2 O 3 catalyst was found to possess the largest NO x storage capacity within the temperature range of 200-350 C (0.883 mmol(NO)/g at 300 C) (Wang et al, 2010).…”

Section: Alkali/alkaline-earth Oxide -Doped Catalystsmentioning

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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Noble metal free NO storage catalysts using cobalt discovered via high-throughput experimentation

Cited by 56 publications

References 34 publications

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

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

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

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

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