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In situ X-ray investigations on AgIn/SiO2 hydrogenation catalysts

Paper ID Volume ID Publish Year Pages File Format Full-Text
44061 46002 2007 8 PDF Available
Title
In situ X-ray investigations on AgIn/SiO2 hydrogenation catalysts
Abstract

The structure of bimetallic catalysts based on silver and indium has been studied during the hydrogenation of acrolein by in situ X-ray absorption spectroscopy. A novel in situ cell, capable of performing X-ray absorption experiments in transmission geometry on catalyst powders under reaction conditions (i.e., temperatures up to 500 °C and pressures up to 20 bar, corrosive atmosphere), was developed for this purpose. Ag K- and In K-spectra were recorded during the acrolein hydrogenation. Changes in the indium valence were observed during the reaction by XANES analysis, whereas silver remained redox inert. The evaluation of the EXAFS spectra exhibited a characteristic peak in r-space at ca. 3 Å during acrolein hydrogenation, which can be understood by a structure model consisting of AgIn clusters partly covered with adsorbed acrolein on the catalyst surface. It could be shown that the adsorbate-metal-distance is different for Ag/SiO2 and AgIn/SiO2 catalysts, which is most likely due to different adsorption geometries. Structural parameters of the catalyst under reaction conditions were determined by a quantitative EXAFS analysis.

Graphical abstractIn this paper, Ag/SiO2 and AgIn/SiO2 hydrogenation catalysts are investigated by means of in situ EXAFS under industrial relevant conditions (i.e., 20 bar and 250 °C). For this purpose, a new in situ cell has been developed, which is also described in this paper. Figure optionsDownload full-size imageDownload as PowerPoint slide

Keywords
Hydrogenation catalysts; Bimetallic catalysts; Acrolein; X-ray absorption spectroscopy; Silver; Indium; In situ-spectroscopy
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In situ X-ray investigations on AgIn/SiO2 hydrogenation catalysts
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Publisher
Database: Elsevier - ScienceDirect
Journal: Applied Catalysis A: General - Volume 318, 20 February 2007, Pages 9–16
Authors
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Subjects
Physical Sciences and Engineering Chemical Engineering Catalysis
Get Full-Text Now
Don't Miss Today's Special Offer
Price was $35.95
You save - $31
Price after discount Only $4.95
100% Money Back Guarantee
Full-text PDF Download
Online Support
Any Questions? feel free to contact us