Thermal stability of ceria catalyst on alumina and its surface oxygen storage capacity
Thermal stability of ceria catalyst on alumina and its surface oxygen storage capacity
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DOI：
10.1016/j.jallcom.2007.04.076
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发表时间：
2008-02
影响因子：
6.2
通讯作者：
M. Ozawa;M. Hattori;Takao Yamaguchi
中科院分区：
文献类型：
--
作者：
M. Ozawa;M. Hattori;Takao Yamaguchi
采用X射线衍射、电子显微镜和储氧性能测定等方法对氧化铈/氧化铝催化剂进行了研究。采用浸渍法制备的CeO 2粉体，其粒径随热处理温度的升高而增大，从600°C时的7 nm增大到1200°C时的31 nm。在600°C下测得的总OSC随HT温度的升高而降低，但是对于本发明的10- 30mol%CeO2掺杂的催化剂，单位CeO 2比表面积的OSC保持不变。氧化铈的比表面积与OSC的关系表明，在600°C时，CeO 2纳米晶中OSC的晶格氧位数为5μmol/m2，与CeO 2的粒径无关。
Ceria catalyst on alumina was studied by X-ray diffraction, electron microscopy and oxygen storage capacity (OSC) measurement. The particle size of CeO2, prepared by an impregnation method, was found to increase with elevated heat treatment (HT) temperatures, from 7nm at 600°C to 31nm at 1200°C for 3h. The total OSC measured at 600°C decreased with increasing HT temperature, however OSC per specific surface area of CeO2was maintained for present 10–30mol% ceria-doped catalyst. The relationship between OSC per Ce-mol and specific surface area of ceria suggested that amount of lattice oxygen site for OSC at 600°C in CeO2nanocrystals was 5μmol/m2, which was not dependent on particle size of CeO2.