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  In situ investigations of structure-activity relationships of a Cu/ZrO2 catalyst for the steam reforming of methanol

Szizybalski, A., Girgsdies, F., Rabis, A., Wang, Y., Niederberger, M., & Ressler, T. (2005). In situ investigations of structure-activity relationships of a Cu/ZrO2 catalyst for the steam reforming of methanol. Journal of Catalysis, 233(2), 297-307. doi:10.1016/j.jcat.2005.04.024.

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Item Permalink: http://hdl.handle.net/11858/00-001M-0000-0015-2C9B-6 Version Permalink: http://hdl.handle.net/11858/00-001M-0000-0019-EACC-C
Genre: Journal Article

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Szizybalski, A., Author
Girgsdies, F., Author
Rabis, A.1, Author              
Wang, Y., Author
Niederberger, M., Author
Ressler, T., Author
Affiliations:
1Max Planck Institute for Chemical Physics of Solids, Max Planck Society, ou_1863404              

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 Abstract: Structure–activity relationships of a nanostructured Cu/ZrO2 catalyst for the steam reforming of methanol (MSR) were investigated under reaction conditions by in situ X-ray absorption spectroscopy (XAS) and X-ray diffraction (XRD) combined with on-line mass spectrometry (MS). Temperature-programmed activation by reduction in hydrogen or by reduction in a mixture of methanol and water (feed) was studied by time-resolved Cu K edge XANES and TG/DSC/MS measurements. Small and disordered CuO particles were identified as the main copper phase present in the precursors. After extended time on stream and treatment at 673 K in hydrogen, no significant sintering of the copper particles or deactivation of the reduced Cu/ZrO2 catalysts was detected, indicating a superior stability of the material. The initially low steam-reforming activity of the Cu/ZrO2 catalyst after reduction in hydrogen could be significantly increased by a temporary addition of oxygen to the feed. This increased activity after oxidative treatment is correlated with an increasing amount of oxygen in the copper particles. 63Cu NMR studies detected only a minor degree of microstrain in the active copper phase of the Cu/ZrO2 catalyst. The decreased reducibility of CuO/ZrO2, the low degree of microstrain, and the correlation between the amount of oxygen remaining in the copper particles and the catalytic activity indicate a different metal support interaction compared with Cu/ZnO catalysts.

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Language(s): eng - English
 Dates: 2005-07-25
 Publication Status: Published in print
 Pages: -
 Publishing info: -
 Table of Contents: -
 Rev. Method: -
 Identifiers: eDoc: 241709
DOI: 10.1016/j.jcat.2005.04.024
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Title: Journal of Catalysis
Source Genre: Journal
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Publ. Info: San Diego, CA. : Academic Press
Pages: - Volume / Issue: 233 (2) Sequence Number: - Start / End Page: 297 - 307 Identifier: ISSN: 0021-9517
CoNE: /journals/resource/954922645027