Sintering inhibition mechanism of platinum supported on ceria-based oxide and Pt-oxide-support interaction

被引：544

作者：

Nagai, Yasutaka ^{[1
]}

Hirabayashi, Takeshi

Dohmae, Kazuhiko

Takagi, Nobuyuki

Minami, Takashi

Shinjoh, Hirofumi

Matsumoto, Shin'ichi

机构：

[1] Toyota Cent R&D Labs Inc, Nagakute, Aichi 4801192, Japan

[2] Toyota Motor Co Ltd, Higashi Fuji Tech Ctr, Shizuoka 4101193, Japan

[3] Toyota Motor Co Ltd, Toyota, Aichi 4718572, Japan

来源：

JOURNAL OF CATALYSIS | 2006年 / 242卷 / 01期

关键词：

platinum; sintering; Pt-oxide-support interaction; XAFS; automotive catalyst;

D O I：

10.1016/j.jcat.2006.06.002

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：

Sintering inhibition mechanism of Pt in Pt/ceria-based oxide catalyst under oxidizing condition at high temperature was studied by several analysis techniques. Pt in a Pt/ceria-based oxide catalyst did not sinter after aging treatment at 800 degrees C in air, but did sinter in a Pt/Al2O3 catalyst. Using X-ray absorption analysis, we found that the Pt-O-Ce bond (i.e., the Pt-oxide-support interaction) acted as an anchor and inhibited the sintering of Pt particles on ceria-based oxide. As a result of further systematic investigation on various Pt catalysts, clearly there was an excellent correlation between the strength of the Pt-oxide-support interaction and the electron density of oxygen in the support oxide. The sintering inhibition effect on Pt can be controlled by the electron density of oxygen in the support through the Pt-oxide-support interaction. (c) 2006 Elsevier Inc. All rights reserved.

引用

页码：103 / 109

页数：7

共 24 条

[1] Mechanisms of catalyst deactivation [J].

Bartholomew, CH .

APPLIED CATALYSIS A-GENERAL, 2001, 212 (1-2) :17-60

[2] Thermal gas treatment to regenerate spent automotive three-way exhaust gas catalysts (TWC) [J].

Birgersson, H ;

Eriksson, L ;

Boutonnet, M ;

Järås, SG .

APPLIED CATALYSIS B-ENVIRONMENTAL, 2004, 54 (03) :193-200

[3]

DIWELL AF, 1991, STUD SURF SCI CATAL, V71, P139, DOI 10.1016/S0167-2991(08)62975-4

[4]

FIEDOROW RMJ, 1978, J CATAL, V51, P193, DOI 10.1016/0021-9517(78)90293-2

[5] SINTERING OF SUPPORTED METAL-CATALYSTS .1. RE-DISPERSION OF SUPPORTED PLATINUM IN OXYGEN [J].

FIEDOROW, RMJ ;

WANKE, SE .

JOURNAL OF CATALYSIS, 1976, 43 (1-3) :34-42

[6]

Forzatti P, 1999, CATAL TODAY, V52, P165, DOI 10.1016/S0920-5861(99)00178-9

[7] MORPHOLOGY OF SUPPORTED METAL-CLUSTERS - DETERMINATION BY EXAFS AND CHEMISORPTION [J].

GREEGOR, RB ;

LYTLE, FW .

JOURNAL OF CATALYSIS, 1980, 63 (02) :476-486

[8] THE SINTERING OF PLATINUM PARTICLES IN AN ALUMINA-SUPPORTED CATALYST - FURTHER TRANSMISSION ELECTRON-MICROSCOPY STUDIES [J].

HARRIS, PJF .

JOURNAL OF CATALYSIS, 1986, 97 (02) :527-542

[9] Interactions of CO with Pt/ceria catalysts [J].

Holmgren, A ;

Andersson, B ;

Duprez, D .

APPLIED CATALYSIS B-ENVIRONMENTAL, 1999, 22 (03) :215-230

[10] The origin of SO2 promotion of propane oxidation over Pt/Al2O3 catalysts [J].

Lee, AF ;

Wilson, K ;

Lambert, RM ;

Hubbard, CP ;

Hurley, RG ;

McCabe, RW ;

Gandhi, HS .

JOURNAL OF CATALYSIS, 1999, 184 (02) :491-498

← 1 2 3 →