In situ observation of platinum sintering on ceria-based oxide for autoexhaust catalysts using Turbo-XAS

被引：48

作者：

Nagai, Yasutaka ^{[1
]}

Dohmae, Kazuhiko ^{[1
]}

Ikeda, Yasuo ^{[2
]}

Takagi, Nobuyuki ^{[3
]}

Hara, Naoyuki ^{[2
]}

Tanabe, Toshitaka ^{[1
]}

Guilera, Gemma ^{[4
]}

Pascarelli, Sakura ^{[4
]}

Newton, Mark A. ^{[4
]}

Takahashi, Naoki ^{[1
]}

Shinjoh, Hirofumi ^{[1
]}

Matsumoto, Shin'ichi ^{[5
]}

机构：

[1] Toyota Cent Res & Dev Labs Inc, Nagakute, Aichi 4801192, Japan

[2] TOYOTA Motor Europe Tech Ctr, B-1930 Zaventem, Belgium

[3] TOYOTA Motor Corp Higashi Fuji Tech Ctr, Shizuoka 4101193, Japan

[4] European Synchrotron Radiat Facil, F-38043 Grenoble, France

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

来源：

CATALYSIS TODAY | 2011年 / 175卷 / 01期

关键词：

Platinum; Sintering; XAFS; Automotive catalyst; Ceria-zirconia; Oxygen storage capacity; ABSORPTION FINE-STRUCTURE; OXYGEN STORAGE CAPACITY; RAY; OXIDATION; DEACTIVATION; REDISPERSION; REDUCTION; SPECTRA; PHASE;

D O I：

10.1016/j.cattod.2011.02.046

中图分类号：

O69 [应用化学];

学科分类号：

081704 ;

摘要：

Using a time resolved X-ray absorption spectroscopy (XAS) technique, we studied an in situ dynamic observation of sintering for Pt particles supported on a ceria-based oxide and Al2O3 supports under cyclic oxidizing/reducing conditions at 800 degrees C. The effect of the support oxide and the amount of Pt loading on the Pt sintering was investigated. The sintering of Pt particles in 2 wt% Pt/ceria-based oxide could be inhibited, when compared to in 2 wt% Pt/Al2O3. Moreover, 0.5 wt% Pt and 1 wt% Pt/ceria-based oxide with a lower Pt loading brought higher stability of Pt against sintering. For a 0.5 wt% Pt/ceria-based oxide catalyst, sintering was completely inhibited and highly dispersed Pt particles (particle size; 1.5 nm) were maintained under redox cycling at 800 degrees C. These results lead to the conclusion that Pt-O-Ce bond formation on the surface of a ceria-based oxide under oxidative conditions in redox cycling inhibits the sintering of Pt particles, and that the Pt-O-Ce anchor site (its strength and number) has an important role in the sintering inhibition of Pt particles on ceria-based oxide. In addition, we note and discuss apparent change in the oxygen storage/release performance of ceria-based oxide from the viewpoint of the Pt particle size and the intrinsic bulk behavior of ceria-based oxide. (C) 2011 Elsevier B.V. All rights reserved.

引用

页码：133 / 140

页数：8

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