Perovskites as Alternatives to Noble Metals in Automotive Exhaust Abatement: Activation of Oxygen on LaCrO3 and LaMnO3

被引:28
作者
Peron, G. [1 ]
Glisenti, A. [1 ,2 ]
机构
[1] Univ Padua, Dept Chem Sci, Via F Marzolo 1, I-35131 Padua, Italy
[2] CNR ICMATE, Via F Marzolo 1, I-35131 Padua, Italy
关键词
Lanthanum chromite; Lanthanum manganate; Perovskite; Soot oxidation; NO reduction; K-doping; DIESEL SOOT; CATALYTIC-ACTIVITY; SIMULTANEOUS REMOVAL; SURFACE-PROPERTIES; PERFORMANCE; COMBUSTION; OXIDATION; OXIDE; KINETICS; NOX;
D O I
10.1007/s11244-018-1120-1
中图分类号
O69 [应用化学];
学科分类号
081704 ;
摘要
In this contribution, perovskitic materials have been tested as substitutes of noble metals in automotive exhaust abatement devices. LaMnO3 and LaCrO3 were the chosen materials. Samples were characterized by means of X-ray diffraction, scanning electron microscopy, BET surface area, temperature programmed reduction and X-ray photoelectron spectroscopy. Reactions tested have been soot oxidation by 10% O-2 and 0.5% NO and stoichiometric 1% NO reduction by 1% CO. LaMnO3 has proved to be a good catalyst for oxidation reactions, whereas LaCrO3 is more suitable for reduction reactions. TPR and XPS analysis have shown a greater oxygen exchange capability in LaMnO3 than in LaCrO3, which is less reducible and strongly bonds adsorbed oxygen. Substitution of 20% La in the A-site of the perovskitic lattice with K has increased activity of both catalysts. In the case of LaCrO3, however, this has lead to a slower reaction course. NO reduction test clearly indicates that Cr-containing perovskite is more suitable for reduction reactions, whereas Mn-based materials are a good choice for oxidative applications. This can relate to superficial oxygen properties and bulk oxygen mobility, as shown by XPS and TPR results.
引用
收藏
页码:244 / 251
页数:8
相关论文
共 27 条
[1]   Methyl ethyl ketone combustion over La-transition metal (Cr, Co, Ni, Mn) perovskites [J].
Alvarez-Galvan, M. C. ;
de la Pena O'Shea, V. A. ;
Arzamendi, G. ;
Pawelec, B. ;
Gandia, L. M. ;
Fierro, J. L. G. .
APPLIED CATALYSIS B-ENVIRONMENTAL, 2009, 92 (3-4) :445-453
[2]   Selective hydrogen oxidation in the presence of C3 hydrocarbons using perovskite oxygen reservoirs [J].
Beckers, Jurriaan ;
Drost, Ruben ;
van Zandvoort, Ilona ;
Collignon, Paul F. ;
Rothenberg, Gadi .
CHEMPHYSCHEM, 2008, 9 (07) :1062-1068
[3]   On the synthesis and stability of La0.6Sr0.4Ga0.3Fe0.7O3 [J].
Bedon, A. ;
Natile, M. M. ;
Glisenti, A. .
JOURNAL OF THE EUROPEAN CERAMIC SOCIETY, 2017, 37 (03) :1049-1058
[4]   Importance of the oxygen bond strength for catalytic activity in soot oxidation [J].
Christensen, Jakob M. ;
Grunwaldt, Jan-Dierk ;
Jensen, Anker D. .
APPLIED CATALYSIS B-ENVIRONMENTAL, 2016, 188 :235-244
[5]   PHYSICOCHEMICAL PROPERTIES OF LAMNO3 - REDUCIBILITY AND KINETICS OF O-2 ADSORPTION [J].
FIERRO, JLG ;
TASCON, JMD ;
TEJUCA, LG .
JOURNAL OF CATALYSIS, 1984, 89 (02) :209-216
[6]   SURFACE-PROPERTIES OF LACRO3 - EQUILIBRIUM AND KINETICS OF O-2 ADSORPTION [J].
FIERRO, JLG ;
TEJUCA, LG .
JOURNAL OF CATALYSIS, 1984, 87 (01) :126-135
[7]   The role of suprafacial oxygen in some perovskites for the catalytic combustion of soot [J].
Fino, D ;
Russo, N ;
Saracco, G ;
Speechia, V .
JOURNAL OF CATALYSIS, 2003, 217 (02) :367-375
[8]   Influence of the surface potassium species in Fe-K/Al2O3 catalysts on the soot oxidation activity in the presence of NOx [J].
Galvez, M. E. ;
Ascaso, S. ;
Stelmachowski, P. ;
Legutko, P. ;
Kotarba, A. ;
Moliner, R. ;
Lazaro, M. J. .
APPLIED CATALYSIS B-ENVIRONMENTAL, 2014, 152 :88-98
[9]   On A-doping strategy for tuning the TWC catalytic performance of perovskite based catalysts [J].
Garbujo, A. ;
Pacella, M. ;
Natile, M. M. ;
Guiotto, M. ;
Fabro, J. ;
Canu, P. ;
Glisenti, A. .
APPLIED CATALYSIS A-GENERAL, 2017, 544 :94-107
[10]   INVESTIGATION OF THE ELECTRONIC-STRUCTURE OF LA1-X(M2+)XCRO3, CR2O3 AND LA2O3 BY X-RAY PHOTOELECTRON-SPECTROSCOPY [J].
HOWNG, WY ;
THORN, RJ .
JOURNAL OF PHYSICS AND CHEMISTRY OF SOLIDS, 1980, 41 (01) :75-81