Structure of ReOx Clusters Attached on the Ir Metal Surface in Ir–ReOx/SiO2 for the Hydrogenolysis Reaction
Structure of ReOx Clusters Attached on the Ir Metal Surface in Ir–ReOx/SiO2 for the Hydrogenolysis Reaction
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DOI：
10.1021/jp308527f
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发表时间：
2012-10
影响因子：
3.7
通讯作者：
Y. Amada;Hideo Watanabe;M. Tamura;Y. Nakagawa;K. Okumura;K. Tomishige
中科院分区：
文献类型：
--
作者：
Y. Amada;Hideo Watanabe;M. Tamura;Y. Nakagawa;K. Okumura;K. Tomishige
利用原位Ir L3边和Re L3边快扫描X射线吸收精细结构，结合程序升温还原、X射线衍射、CO吸附测试、拉曼光谱和X射线光电子能谱研究了Ir/SiO_2和Ir-ReO_x/SiO_2在程序升温还原过程中的结构变化。Ir-ReOx/SiO_2上的金属氧化物比单金属Ir/SiO_2和ReO_x/SiO_2上的金属氧化物更容易被还原，这是由于三氧稀土物种与IrO_2相的相互作用所致。经485-595K还原后的Ir-ReOx/SiO_2的金属结构为立方八面体Ir金属颗粒，表面覆盖着三维的ReOx团簇。
The structural change of Ir/SiO2 and Ir–ReOx/SiO2 during the temperature programmed reduction with H2 was investigated using in situ Ir L3-edge and Re L3-edge quick-scanning X-ray absorption fine structure in the combination of temperature programmed reduction with H2, XRD, the measurement of CO adsorption, Raman spectroscopy, and X-ray photoelectron spectroscopy. The metal oxide on Ir–ReOx/SiO2 was much more easily reduced than that on monometallic Ir/SiO2 and ReOx/SiO2, which is explained by the interaction between trioxo Re species and the IrO2 phase. The metal structure of Ir–ReOx/SiO2 constructed after reduction at 485–595 K is the cuboctahedron Ir metal particles covered with three-dimensional ReOx clusters.