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Peter, S.; Garbowski, Édouard; Perrichon, V.; Primet, Michel

doi:10.1023/a:1019027619209

Cited by 48 publications

(23 citation statements)

References 11 publications

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“…Since perovskites are relatively low-cost materials and can be both oxidation and reduction catalysts, they were proposed as automotive exhaust treatment catalysts [2]. Most research on the reduction of NO with CO over perovskites has focused on the need to control NO and CO emissions from motor vehicles [3][4][5][6]. It has been reported [3,5] that the following sequence of surface reaction steps occurs for the overall reaction to achieve the reaction of NO with CO:…”

Section: Resultsmentioning

confidence: 99%

Ammonia-Free NOx Control System

Wu¹

2003

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Section: Resultsmentioning

confidence: 99%

Ammonia-Free NOx Control System

Wu¹

2003

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“…So, it is necessary to explore new kinds of LNT catalysts without using noble metals to lower the catalyst cost. It is well known that perovskites have good redox property and high thermal stability, so, they are often used for CO, VOC and soot oxidation [5][6][7][8], and NO reduction by CO or C 3 H 6 [9][10][11]. Compared with supported Pt catalysts, perovskites sometimes display comparable or higher activity [12].…”

Section: Introductionmentioning

confidence: 99%

“…This result suggests the formation of Ce-rich Ce-Zr oxide solid solution. Although some diffraction peaks of perovskite LaCoO 3 are overlapped with those of the support, other two peaks for LaCoO 3 phase at 2h = 27.028, 47.668 can still be detected, indicating the existence of supported perovskite LaCoO 3[11]. For all the catalysts no phases of single oxides such as La 2 O 3 or Co 3 O 4 are identified, and no K-related phases are detected, either, implying that the K component is highly dispersed in the catalysts or exists in amorphous state.…”

mentioning

confidence: 95%

Perovskite-Based Lean-Burn NO x Trap Catalysts Without Using Platinum Group Metals: K/LaCoO3/Ce1−x Zr x O2

Meng

2011

Catal Lett

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A series of Ce 1-x Zr x O 2 (x = 0, 0.1, 0.2, 0.3) solid solution supported lean-burn NO x trap (LNT) catalysts K/LaCoO 3 /Ce 1-x Zr x O 2 were prepared by successive impregnation. After sulfation the supported perovsikte LaCoO 3 was well maintained; reducing treatment partly destroyed the perovsikte, but it can be well recovered by re-oxidation treatment. Based on NO x storage and sulfurresisting performance of the catalysts, the optimal atomic ratio of Zr in Ce 1-x Zr x O 2 support is x = 0.2. The catalyst K/LaCoO 3 /Ce 0.8 Zr 0.2 O 2 exhibits much better NO x storage capacity than the Pt-based catalyst Pt/K/Ce 0.8 Zr 0.2 O 2 , which is highly related to its stronger capability for NO to NO 2 oxidation. During NO x storage much larger amounts of nitrate and nitrite species were identified by in situ DRIFTS over perovskite-based catalysts than over Pt-based one. The H 2 -TPR results reveal that after deep sulfation little sulfur species were deposited on the catalyst K/LaCoO 3 /Ce 1-x Zr x O 2 , showing strong sulfur-resisting ability. As a result, it is thought that the full replacement of Pt by perovskite LaCoO 3 in the corresponding LNT catalysts is feasible.

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“…This mission is challenging because ''classical'' supports (Al 2 O 3 and SiO 2 ) form non-active spinels with the majority of the transition metals [6,7]. New supports or amelioration of the known ones by coating with inert materials toward perovskite components seem to be the only solutions [8][9][10][11]. Zirconia and ceria containing materials are promising as supports due to their inability to enter into the perovskite lattice with any of the most used cations for environmental purposes, e.g.…”

Section: Introductionmentioning

confidence: 99%