Flame-made Pt/ceria/zirconia for low-temperature oxygen exchange

被引：68
作者：
Stark, WJ
Grunwaldt, JD
Maciejewski, M
Pratsinis, SE
Baiker, A [1 ]
机构：
[1] ETH Honggerberg, Inst Chem & Bioengn, Dept Chem & Appl Biosci, CH-8093 Zurich, Switzerland
[2] ETH, Dept Mech Engn, Particle Technol Lab, CH-8092 Zurich, Switzerland
来源：
CHEMISTRY OF MATERIALS | 2005年 / 17卷 / 13期
关键词：
D O I：
10.1021/cm050538+
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：
The preparation of platinum (0-2 wt %) supported on ceria/zirconia (Ce0.5Zr0.5O2) by flame synthesis resulted in materials with good thermal stability and improved dynamic oxygen exchange capacity at low temperatures. Comparison to a conventionally prepared material (precipitation and incipient wetness impregnation) showed an increased specific surface area for the flame-made catalysts after sintering at 1100 degrees C for 6 h in air. For low Pt content (0.1-0.5 wt %), the onset in low-temperature oxygen exchange activity of flame-made materials was even improved after a first redox test run. Repeated test runs up to 1100 degrees C deactivated the reference material for oxygen exchange below 300 degrees C, while the flame-made materials showed improved activity down to around 150 degrees C. Fluorescence EXAFS revealed the presence of oxidized Pt on the pre-sintered materials and confirmed the role of reduced Pt on the hydrogen activation prior to oxygen exchange. It further uncovered pronounced differences in Pt reducibility depending on the Pt loading.
引用
收藏
页码：3352 / 3358
页数：7
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