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          Institute: Fritz-Haber-Institut     Collection: Inorganic Chemistry     Display Documents

ID: 278013.1, Fritz-Haber-Institut / Inorganic Chemistry
Promotion effect in Pt–ZnO catalysts for selective hydrogenation of crotonaldehyde to crotyl alcohol: A structural investigation
Authors:Wang, Di; Ammari, F.; Touroude, R.; Su, Dang Sheng; Schlögl, Robert
Research Context:Electron microscopic investigations on the important catalytic systems
Date of Publication (YYYY-MM-DD):2009-10
Title of Journal:Catalysis Today
Journal Abbrev.:Catal. Today
Issue / Number:3-4
Start Page:224
End Page:230
Copyright:© 2008 Elsevier B.V. All rights reserved.
Review Status:Peer-review
Audience:Experts Only
Abstract / Description:Pt–ZnO catalysts prepared from different precursors, H2PtCl6 and Pt(NH3)4(NO3)2, and reduced at increased temperatures are used to achieve high selectivity towards crotyl alcohol in hydrogenation of crotonaldehyde. The ex-chloride catalyst shows a higher activity and selectivity than the ex-nitrate one. Transmission electron microscopy, electron diffraction, high-resolution imaging, energy dispersive X-ray spectroscopy and element mapping are used to characterize the catalysts in order to correlate the microstructure to the catalytic behavior. PtZn alloy formation is confirmed for both ex-chloride and exnitrate catalysts reduced at 673 K. The metal particles in ex-nitrate catalyst are smaller in size than those in ex-chloride. Inmost aggregates of the ex-chloride catalyst, chlorine is distributed homogeneously with low concentration (<1%). The higher chlorine concentration in some region leads to local morphology and microstructure changes. Influences of the observed structural features such as alloy formation, particle size difference, formation of ill-defined material, and chlorine distribution are discussed.
Free Keywords:Crotyl alcohol, PtZn alloy, Electron diffraction, High-resolution electron microscopy, Energy dispersive X-ray spectroscopy, Element mapping
External Publication Status:published
Document Type:Article
Communicated by:Robert Schlögl
Affiliations:Fritz-Haber-Institut/Inorganic Chemistry/Microstructure
Fritz-Haber-Institut/Inorganic Chemistry/Inorganic Chemistry
External Affiliations:LMSPC-UMR 7515 du CNRS, ECPM-ULP, Strasbourg, France
Identifiers:URL:http://dx.doi.org/10.1016/j.cattod.2008.10.018 [only for subscriber]
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