NOx adsorption on K and Ba loaded on zirconia-titania NSR catalysts: A comparative study by in situ and operando IR spectroscopy

被引：23

作者：

Nguyen, Hai P. ^{[1
]}

Del Valle, Sandra Palma ^{[2
]}

Marie, Olivier ^{[2
]}

机构：

[1] Toyota Motor Europe, B-1930 Zaventem, Belgium

[2] LCS UMR6506 UNICAEN, ENSICAEN, Caen, France

来源：

APPLIED CATALYSIS B-ENVIRONMENTAL | 2018年 / 231卷

关键词：

NSR; NOx adsorption; Cation chemical hardness; Potassium; Zirconia-titania; Barium; SOOT REMOVAL; STORAGE; PT/K/GAMMA-AL2O3; PERFORMANCE; STABILITY; WATER; FTIR;

D O I：

10.1016/j.apcatb.2018.03.002

中图分类号：

O64 [物理化学（理论化学）、化学物理学];

学科分类号：

070304 ; 081704 ;

摘要：

An intensive in situ and operando IR study on NOx adsorption over potassium (K) loaded zirconia-titania NSR catalyst in comparison to a barium (Ba) loaded one is reported. Based on in situ IR experiments, NOx adsorption under heated environment was confirmed to favor potassium bidentate nitrate species rather than ionic nitrate species observed for Ba-loaded NSR catalyst (previously published). Complementary operando IR experiments revealed different mechanisms for NO adsorption over the two NO storage materials (NSMs): initial simultaneous NO3- and NO3- formation over K loaded catalyst while over Ba-loaded one, NO2- is first accumulated before being converted to NO3-. Isotopic labelling in combination with operando experiments identified distinct dynamic behaviors regarding the exchange between nitrogen containing species on surface and in gas phase. This work provides beneficial inputs for advanced catalyst converter design, for example with zone-coated washcoat that contains more than one catalyst formulations.

引用

页码：391 / 399

页数：9

共 39 条

[1] Fe-H-BEA and Fe-H-ZSM-5 for NO2 removal from ambient air - A detailed in situ and operando FTIR study revealing an unexpected positive water-effect [J].