期刊
JOURNAL OF SYNCHROTRON RADIATION
卷 12, 期 -, 页码 675-679出版社
INT UNION CRYSTALLOGRAPHY
DOI: 10.1107/S0909049505020261
关键词
X-ray absorption spectroscopy; in situ; operando; model catalysis; catalysis
A new spectroscopic cell has been designed for studying model catalysts using in situ or operando X-ray absorption spectroscopy. The setup allows gas treatment and can be used between 100 and 870 K. Pressures from 10(-3) Pa up to 300 kPa can be applied. Measurements on model systems in this particular pressure range are a valuable extension of the commonly used UHV characterization techniques. Using this setup, we were able to analyze the Au L-3 EXAFS of a silica wafer covered with sub-monolayer concentrations of gold (0.05 ML). By modifying the sample holder, powder catalysts can also be analyzed under plug-flow conditions. As an example, the reduction of a Au/SiO2 powder catalyst prepared from HAuCl4 was followed.
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