Catalytically active states of Ru(0001) catalyst in CO oxidation reaction
Catalytically active states of Ru(0001) catalyst in CO oxidation reaction
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DOI：
10.1016/j.jcat.2006.02.019
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发表时间：
2006-04-25
影响因子：
7.3
通讯作者：
Kiskinova, M
中科院分区：
文献类型：
--
作者：
Blume, R;Hävecker, M;Kiskinova, M
确定在动态操作条件下金属催化剂的催化活性状态的组成对于氧化催化特别重要。在这里，我们报告了新的见解不同的催化活性状态形成的Ru（0001）催化剂在CO氧化过程中在不同的反应温度下的化学身份。在10（-4）-10（-1）mbar的压力范围内，通过基于同步加速器的高压X射线光电子能谱和质谱原位跟踪Ru催化剂的表面组成和CO2产率在不同反应条件下的变化。结果表明，几层厚的表面氧化物没有明确的化学计量和结构的催化活性与化学计量的RuO 2（110）相。这种表面氧化物在RuO 2形成受到动力学阻碍的反应条件下形成，并且可以在宽的温度和压力范围内与RuO 2共存。(c)2006年爱思唯尔公司All rights reserved.
Identifying the composition of the catalytically active state of metal catalysts under dynamic operating conditions is of particular importance for oxidation catalysis. Here we report new insights into the chemical identity of different catalytically active states formed on a Ru(0001) catalyst during CO oxidation at various reaction temperatures. The changes in the surface composition of the Ru catalyst and the CO2 yield under varying reaction conditions in the 10(-4)-10(-1) mbar pressure range were followed in situ by synchrotron-based high-pressure X-ray photoelectron spectroscopy and mass spectroscopy. The results reveal that the catalytic activity of a few layers thick surface oxide without well-defined stoichiometry and structure is comparable with that of the stoichiometric RuO2(110) phase. This surface oxide forms under reaction conditions when RuO2 formation is kinetically hindered and can coexist with RuO2 in wide temperature and pressure ranges. (c) 2006 Elsevier Inc. All rights reserved.