Nature of the perovskites surface centers as studied by the Infrared spectroscopy of adsorbed NO test molecule

被引：21

作者：

Isupova, LA ^{[1
]}

Budneva, AA ^{[1
]}

Paukshtis, EA ^{[1
]}

Sadykov, VA ^{[1
]}

机构：

[1] Russian Acad Sci, Boreskov Inst Catalysis, Siberian Branch, Novosibirsk 630090, Russia

来源：

JOURNAL OF MOLECULAR CATALYSIS A-CHEMICAL | 2000年 / 158卷 / 01期

关键词：

IR; adsorbed NO; (La1-xMxMeO3)-Me-1-O-2; (Me-1; Ca; Sr; Me-2; Mn; Co; Fe); perovskite;

D O I：

10.1016/S1381-1169(00)00090-X

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：

FTIR spectroscopy of adsorbed NO revealed a variety of types of coordinatively unsaturated surface cations for lanthanum cobaltites, manganites, and ferrites, some of which emerge due to room-temperature surface reduction by the test molecule. For the surface of LaFeO3, clusters of coordinatively unsaturated Fe2+ cations associated with surface defects dominate. For the surface of LaCoO3 and LaMnO3, coordinatively unsaturated Me+3 cations are mainly revealed, being more coordinated by oxygen for the former system. These results could be used to analyze the catalytic properties of perovskites in the reaction of CO oxidation, provided the density of surface sites and reaction mechanism are taken into account. (C) 2000 Elsevier Science B.V. All rights reserved.

引用

页码：275 / 280

页数：6

共 18 条

[1]

AVVAKUMOV EG, 1986, MECH METHODS CHEM PR

[2]

Aylor AW, 1996, STUD SURF SCI CATAL, V101, P661

[3] NO adsorption, desorption, and reduction by CH4 over Mn-ZSM-5 [J].

Aylor, AW ;

Lobree, LJ ;

Reimer, JA ;

Bell, AT .

JOURNAL OF CATALYSIS, 1997, 170 (02) :390-401

[4]

Campa MC, 1998, APPL CATAL B-ENVIRON, V18, P151

[5]

Davydov A. A., 1984, IR SPECTROSCOPY SURF

[6]

KOSOVA NV, 1998, IAN SSSR NEORG MATER, V34, P478

[7] A STUDY OF NO AND CO INTERACTIONS WITH LAMNO3 [J].

PENA, MA ;

TASCON, JMD ;

FIERRO, JLG ;

TEJUCA, LG .

JOURNAL OF COLLOID AND INTERFACE SCIENCE, 1987, 119 (01) :100-107

[8]

RAO CNR, 1990, NEW DIRECTIONS SOLID, P520

[9] Comparative study of catalytic reduction of nitric oxide with carbon monoxide over the La1-xSrxBO3 (B = Mn, Fe, Co, Ni) catalysts [J].

Shen, ST ;

Weng, HS .

INDUSTRIAL & ENGINEERING CHEMISTRY RESEARCH, 1998, 37 (07) :2654-2661

[10] Mechanistic study of NO reduction with methane over Co2+ modified ZSM-5 catalysts [J].

Sun, T ;

Fokema, MD ;

Ying, JY .

CATALYSIS TODAY, 1997, 33 (1-3) :251-261

← 1 2 →