De-NOx in alternative lean/rich atmospheres on La1−xSrxCoO3 perovskites

Li, Xingang; Dong, Yong; Xian, Hui; Hernández, Willinton Y.; Meng, Ming; Zou, Honghu; Ma, Aiyuan; Zhang, Tianyong; Jiang, Zheng; Tsubaki, Noritatsu; Vernoux, P.

doi:10.1039/c1ee01726h

Cited by 97 publications

(76 citation statements)

References 26 publications

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“…The E v values of the La-ter models were greater than those of the Mn-ter models for all Sr-doping models, suggesting that O-vacancies preferred to form on the Mn-ter surface, rather than the La-ter surface, i.e. 7,31,32 Overall, the effect of Sr is to promote the oxidation activity and O-vacancy formation in the LaMnO 3 (001) planes. The results are in agreement with the discussion of the electronic structures in Fig.…”

Section: O-vacancy Formation Energymentioning

confidence: 91%

“…[1][2][3] In a common NSR catalyst, Pt/BaO/Al 2 O 3 , NO is oxidized to NO 2 on Pt and subsequently adsorbed on BaO as a nitrate species in the lean-burn period. 7,8 The oxidation activity depends on the reducibility, oxygen mobility within the lattice, and the surface defects. Recently, Sr-doped perovskite oxides (ABO 3 ) were discovered to be efficient platinum substitutes in diesel oxidation and NSR reactions.…”

Section: Introductionmentioning

confidence: 99%

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Experimental and DFT studies on Sr-doped LaMnO₃ catalysts for NO_x storage and reduction

Peng

et al. 2015

Catal. Sci. Technol.

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The idea of rational design of perovskite catalysts for NO x storage and reduction (NSR) starts from DFT studies on Sr-doped LaMnO 3 (001) plane models: a Mn-terminated plane (Mn-ter) has a higher activity than La-or Sr-ter planes; the number of A-site defects increases when Sr is doped on the surface; O-vacancy formation energies for both La-and Mn-ter gradually decrease with increased Sr loading, and the values for La-ter are always larger than for Mn-ter with the same Sr loading, indicating that the O-vacancy formation is facile on Mn-ter with Sr-doping. This model yields the highest reactivity for oxidation and the lowest energy barrier for O-vacancy formation. A surface tuning method for La 0.5 Sr 0.5 MnO 3 is introduced. With the exception of the promotion of surface area and pore volume, the ratio of Sr/La and the number of surface-active oxygen atoms and Mn 4+ cations exposed on the outermost layers are improved with an increased contact time between the raw materials and dilute HNO 3 . However, overtreatment leads to a less stable phase of MnO 2 with a high reducibility but significantly restrained NO x adsorption. NSR performances under lean-burn/fuel-rich cycles are measured, and the results correspond well with the NO adsorption or oxidation behaviors and DFT calculations.Catal. Sci. Technol. This journal is

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Section: O-vacancy Formation Energymentioning

confidence: 91%

Section: Introductionmentioning

confidence: 99%

Experimental and DFT studies on Sr-doped LaMnO₃ catalysts for NO_x storage and reduction

Peng

et al. 2015

Catal. Sci. Technol.

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“…Also, Li et al. [34] demonstrated that these lanthanum based perovskites exhibit a high NOx conversion and N 2 selectivity for different gas composition. Furthermore, it was proved that the incorporation of Fe into the perovskite structure improves the sulfur tolerance of the catalysts [35,36].…”

Section: Introductionmentioning

confidence: 99%

“…Looking for alternatives for current platinum-based NSR catalysts, mixed oxides with perovskite structure have been recently used for NOx storage and reduction [26][27][28][29][30][31][32][33][34][35][36]. Thus, Ueda et al [30] employed a (La 0.…”

Section: Introductionmentioning

confidence: 99%

BaTi1−xCuxO3 perovskites: The effect of copper content in the properties and in the NOx storage capacity

Albaladejo-Fuentes

López-Suárez

Sánchez-Adsuar

et al. 2014

Applied Catalysis A: General

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Please cite this article as: V. Albaladejo-Fuentes, F.E. López-Suárez, M.S. Sánchez-Adsuar, M.J. Illán-Gómez, −x Cu x O 3 perovskites: the effect of copper content in the properties and in the NOx storage capacity., Applied Catalysis A, General (2014), http://dx.doi.org/10.1016/j.apcata. 2014.09.032 This is a PDF file of an unedited manuscript that has been accepted for publication. As a service to our customers we are providing this early version of the manuscript. The manuscript will undergo copyediting, typesetting, and review of the resulting proof before it is published in its final form. Please note that during the production process errors may be discovered which could affect the content, and all legal disclaimers that apply to the journal pertain. XRD and Raman spectroscopy results indicate that all the copper containing catalysts present a distortion of the original tetragonal structure due to the incorporation of copper into the lattice.The XPS and H 2 -TPR results reveal that the copper catalysts, except for BaTiCu0.5 catalyst, present two copper species (with different electronic interaction with the perovskite) and active surface oxygen species. Additionally, it seems that the fraction of copper with a strong electronic interaction with the perovskite or incorporated into the perovskite structure increases with the copper content.The active sites created on the BaTi 1-x Cu x O 3 perovskite surface bring to the catalysts activity for the NO to NO 2 oxidation and for the NOx adsorption. The NOx storage capacity increases with the copper content and reaches a limit for the BaTiCu2 catalyst (300 µmol/g, at 420ºC) which is within the range of the values reported for the noble metal-based catalysts.

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“…Recently, Li et al [9] proposed a perovskite-based, Pt free lean NO x trap (LNT) catalyst shows promising NO x storage capacities. However, it is limited by its regeneration during the rich phase.…”

Section: Introductionmentioning

confidence: 99%

Pt-free, non-thermal plasma-assisted NO storage and reduction over M/Ba/Al2O3 (M = Mn, Fe, Co, Ni, Cu) catalysts

et al. 2015

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a b s t r a c tBased on their high NO x storage capacities (NSCs), a series of M/Ba/Al (M = Mn, Fe, Co, Ni, Cu) catalysts were evaluated in NO x storage-reduction catalysis. Although the M/Ba/Al catalysts exhibited high NSC values, they exhibited much lower activity during lean-rich cycling compared with a traditional Pt/Ba/Al catalyst, indicating that regeneration of stored NO x is the rate limiting step for the M/Ba/Al samples. By employing an H 2 -plasma in the rich phase to assist reduction of the stored NO x , the NO x conversion was greatly improved, especially at low temperature.

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De-NOx in alternative lean/rich atmospheres on La1−xSrxCoO3 perovskites

Cited by 97 publications

References 26 publications

Experimental and DFT studies on Sr-doped LaMnO₃ catalysts for NO_x storage and reduction

Experimental and DFT studies on Sr-doped LaMnO₃ catalysts for NO_x storage and reduction

BaTi1−xCuxO3 perovskites: The effect of copper content in the properties and in the NOx storage capacity

Pt-free, non-thermal plasma-assisted NO storage and reduction over M/Ba/Al2O3 (M = Mn, Fe, Co, Ni, Cu) catalysts

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De-NOx in alternative lean/rich atmospheres on La1−xSrxCoO3 perovskites

Cited by 97 publications

References 26 publications

Experimental and DFT studies on Sr-doped LaMnO3 catalysts for NOx storage and reduction

Experimental and DFT studies on Sr-doped LaMnO3 catalysts for NOx storage and reduction

BaTi1−xCuxO3 perovskites: The effect of copper content in the properties and in the NOx storage capacity

Pt-free, non-thermal plasma-assisted NO storage and reduction over M/Ba/Al2O3 (M = Mn, Fe, Co, Ni, Cu) catalysts

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Experimental and DFT studies on Sr-doped LaMnO₃ catalysts for NO_x storage and reduction

Experimental and DFT studies on Sr-doped LaMnO₃ catalysts for NO_x storage and reduction