NO  storage-reduction over combined catalyst Mn/Ba/Al2O3–Pt/Ba/Al2O3

Xiao, Jian‐Kang; Li, Xuehui; Deng, Sha; Wang, Furong; Wang, Lefu

doi:10.1016/j.catcom.2006.09.020

Cited by 31 publications

(29 citation statements)

References 32 publications

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“…For the Pt/Cu/Ba/Al catalyst, lower NO to NO 2 oxidation activity is observed compared with Pt/Ba/Al.Correlating the XPS measurements with the NOC data, it can be summarized that surface adsorbed oxygen plays an important role in NO oxidation; i.e., Pt/Co/Ba/Al and Pt/Mn/Ba/Al catalysts, containing higher amounts of surface oxygen than Pt/Ba/Al, exhibit higher NO oxidation capacity.µmol/g at 400°C; this result can be attributed to the fact that the basic nature of BaO imparts relatively high thermal stability to the nitrate[11]. For the Pt/Co/Ba/Al and Pt/Mn/Ba/Al samples much higher NO x storage capacity is obtained in the temperature range of interest, indicating that the presence of transition metal oxides as the NO oxidation component and barium as the chief NO x storage component significantly improves NO x storage capacity at all temperatures, in agreement with the findings of Xiao[30] and Wang et al[28]. Moreover, the highest NSC value is obtained at 300 o C over Pt/Co/Ba/Al and Pt/Mn/Ba/Al, the value decreasing at 400 o C. This may be due to the reduced thermal stability of nitrate due to the presence of the Co and Mn oxides.…”

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confidence: 87%

Non-thermal plasma enhanced NSR performance over Pt/M/Ba/Al2O3 (M = Mn, Co, Cu) catalysts

Bai

Zhang

Chen

et al. 2017

Chemical Engineering Journal

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Non-thermal plasma enhanced NSR performance over Pt/M/Ba/Al 2 O 3 (M = Mn, Co, Cu) catalysts, Chemical Engineering Journal (2016), doi: http://dx. AbstractTo improve the NO x storage capacity (NSC) of lean NO x trap (LNT) catalysts of the Pt/BaO/Al 2 O 3 type, the catalyst was doped with redox active transition metals of Mn, Co, or Cu, respectively. Due to differences in the chemical states of the doped metals, the catalysts exhibited different catalytic behaviors. Co and Mn doped catalysts showed improved NO to NO 2 oxidation ability, and therefore enhanced NO x storage capacities, which led to the increased cycle averaged NO x conversions as compared to a Pt/Ba/Al 2 O 3 reference. However, being limited by NO x reduction in rich phase, the NO x conversions were still poor at low temperatures (<250 o C). By employing an H 2 -plasma in rich phase to assist NO x reduction, NO x conversions were greatly enhanced especially for low temperatures (≤250 o C). The best properties were achieved over Pt/Co/Ba/Al 2 O 3 catalyst which exhibited NO x conversions higher than 80% in the whole temperature range (150 to 350 o C) and best SO 2 resistance abilities.

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confidence: 87%

Non-thermal plasma enhanced NSR performance over Pt/M/Ba/Al2O3 (M = Mn, Co, Cu) catalysts

Bai

Zhang

Chen

et al. 2017

Chemical Engineering Journal

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“…Manganese is also found to be an effective additive for Ba-based LNT catalysts. Le Phuc et al [10][11][12] found that Mn addition to Pt/Ba/Al improved NO x storage capacity and led to an improvement of NO x reduction (conversion and selectivity to N 2 ) at 400 • C. Xiao et al [13] found that Mn/Ba/Al exhibited http://dx.doi.org/10.1016/j.apcatb.2014. 10.001 0926-3373/© 2014 Elsevier B.V. All rights reserved.…”

Section: Introductionmentioning

confidence: 99%

NO storage and reduction properties of model manganese-based lean NO trap catalysts

Zhang

Chen

Wang

et al. 2015

Applied Catalysis B: Environmental

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a b s t r a c tIn order to study the role of manganese in LNT catalysis, model Pd/Mn/Ba/Al, Pd/Mn/Al and Pd/Ba/Al catalysts were prepared and characterized. Both Mn-containing catalysts exhibited higher activity for NO oxidation to NO 2 than the Pd/Ba/Al reference catalyst, although NO x -TPD experiments showed that adsorbed NO x species were weakly bound on Pd/Mn/Al. Consequently, the presence of Ba was essential for high storage capacity. Compared to the Pd/Ba/Al reference, Pd/Mn/Ba/Al showed significantly improved NO x conversion under lean-rich cycling conditions as a consequence of its increased activity for NO oxidation and hence, superior NO x storage efficiency. In addition, the presence of Mn greatly lessened the inhibiting effects of H 2 O and CO 2 on cycle-averaged NO x conversion, this being due to the facile decomposition of manganese carbonate at low temperatures as evidenced by DRIFTS. Significantly, the Pd/Mn/Ba/Al catalyst displayed comparable activity to a traditional LNT catalyst of the Pt/Ba/Al type, showing the promising prospect of such new type of LNT catalysts.

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“…Sulfur poisons the key components of the NSR catalysts (Pt or BaO). Different attempts toward controlling the composition of the NSR catalysts, which can prevent their poisoning by SO 2 (Xiao et al, 2008;Yamazaki et al, 2001;Hendershot et al, 2004) were proposed. Studies focused mainly on the modification of the support (Al 2 O 3 ) were reported to improve the NSR activity.…”

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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NO storage-reduction over combined catalyst Mn/Ba/Al2O3–Pt/Ba/Al2O3

Cited by 31 publications

References 32 publications

Non-thermal plasma enhanced NSR performance over Pt/M/Ba/Al2O3 (M = Mn, Co, Cu) catalysts

Non-thermal plasma enhanced NSR performance over Pt/M/Ba/Al2O3 (M = Mn, Co, Cu) catalysts

NO storage and reduction properties of model manganese-based lean NO trap catalysts

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

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