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Operando X-ray Spectroscopy Study of Pd and Pd-Au Laterally Condensed Catalysts during Selective Acetylene
Eylül Öztuna1,2, Thomas Götsch1, Daniel Cruz1
1Fritz-Haber-Institut der Max-Planck-Gesellschaft, Department of Inorganic Chemistry, Faradayweg 4-6, Berlin, Germany.
Abstract:
In this study, near ambient pressure X-ray photoelectron and X-ray absorption spectroscopy (NAP-XPS and NAP-XAS) were performed during the selective acetylene hydrogenation reaction on Pd and Pd-Au laterally condensed catalysts. The activity and selectivity of this reaction are strongly influenced by the incorporation of carbon into the Pd and Pd-Au lattice, which is investigated by both experiment and theory. We find that Pd can take up much more carbon than Pd-Au, which can be used to tune the activity of the catalyst during the hydrogenation reactions. The amount of the carbonaceous species dissolved in the Pd and Pd-Au lattice was quantified and their effect on the chemical and the electronic structure was tracked by means of operando spectroscopy throughout different stages of the acetylene hydrogenation reaction.
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