Impact of thermal and vehicle aging on the structure and functionalities of a lean NOx-trap

被引：16

作者：

Benramdhane, Sheima ^{[1
]}

Millet, Claire-Noelle ^{[1
]}

Jeudy, Eric ^{[1
]}

Lavy, Jacques ^{[1
]}

Aube, Vanessa Blasin ^{[2
]}

Daturi, Marco ^{[2
]}

机构：

[1] IFP Energies Nouvelles, Rond Point Echangeur Solaize, F-69360 Solaize, France

[2] Univ Caen, CNRS, ENSICAEN, Catalyse & Spectrochim Lab, F-14050 Caen, France

来源：

CATALYSIS TODAY | 2011年 / 176卷 / 01期

关键词：

Lean NOx Trap (LNT); NOx storage catalyst; Thermal aging; Vehicle aging; Sulfation; SO2; Operando FTIR; IN-SITU FTIR; STORAGE CATALYST; SULFUR TOLERANCE; IR SPECTROSCOPY; REDUCTION; ADSORPTION; MECHANISM; BAO/AL2O3; REMOVAL;

D O I：

10.1016/j.cattod.2011.03.049

中图分类号：

O69 [应用化学];

学科分类号：

081704 ;

摘要：

Investigations of the aging behaviour of a commercial lean NOx trap (LNT) are reported in this paper. Two aging processes were tested and compared: a hydrothermal aging at 800 degrees C and a vehicle aging corresponding to a 80,000 km use. Samples were characterized with Operando FTIR, XRF, XRD, SEM-EDX, TEM, and BET analyses. LNT functionalities were evaluated using a flow reactor capable of performing NOx storage and conversion measurements, and correlated with the LNT structure evolution due to aging. The results highlighted that Pt sintering had an impact on the NO oxidation functionality and also deteriorated the Pt/Ba interface. It was hence partly responsible for the NSC decrease. Both aging processes had a similar impact on the LNT NOx storage capacity (NSC) although their structural evolutions were different: BaAl2O4 formation on the hydrothermal aged catalyst versus barium poisoned by sulphur on the vehicle aged catalyst. (C) 2011 Elsevier B.V. All rights reserved.

引用

页码：56 / 62

页数：7

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