title: An in situ and operando X-ray absorption spectroscopy setup for measuring sub-monolayer model and powder catalysts.
abstract: 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 L3 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.
authors.affiliation: Institute for Chemical and Bioengineering, Swiss Federal Institute of Technology (ETH) Zurich, 8093 Zurich, Switzerland.
authors.forename: Norbert
authors.initials: N
authors.lastname: Weiher
authors.forename: Eveline
authors.initials: E
authors.lastname: Bus
authors.forename: Blazej
authors.initials: B
authors.lastname: Gorzolnik
authors.forename: Martin
authors.initials: M
authors.lastname: Möller
authors.forename: Roel
authors.initials: R
authors.lastname: Prins
authors.forename: Jeroen Anton
authors.initials: JA
authors.lastname: van Bokhoven