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Increasing Pt selectivity to vinylaniline by alloying with Zn via reactive metal–support interaction

Paper ID Volume ID Publish Year Pages File Format Full-Text
53654 46978 2015 9 PDF Available
Title
Increasing Pt selectivity to vinylaniline by alloying with Zn via reactive metal–support interaction
Abstract

•Pt/Zn intermetallic nanoparticles formed via metal (Pt)–support (ZnO) interactions.•Pt–Zn alloy formation confirmed by XRD and XPS analyses.•97% yield to 3-vinylaniline achieved in hydrogenation of 3-nitrostyrene.•Pt/ZnO allowed the highest 3-vinylaniline yield as compared to benchmark catalysts.

The promoting effect of Zn on Pt-based catalyst was studied for the liquid-phase hydrogenation of 3-nitrostyrene (3-NS). The monodispersed Pt nanoparticles (ca. 2.3 nm) supported on ZnO catalyzed the target 3-vinylaniline (3-VA) formation (S3-VA = 97% at X3-NS ≈ 100%). Such catalytic performance was attributed to the intermetallic Pt/Zn active phase formed via reactive metal (Pt)–support (ZnO) interaction during reductive calcinations. The reference catalysts (Pt/Al2O3, Pt/C, Pt/MgO and Pt/TiO2) have not provided such high selectivity under the same reaction conditions. The solvent effect was studied showing the highest activity (TOF = 64 min−1) and 3-VA selectivity (S3-VA = 97% at X3-NS ≈ 100%) in ethanol. The obtained activation energy (Ea = 40 kJ mol−1) is in agreement with the literature values for nitroarenes hydrogenation. The variation of H2 partial pressure had no significant effect on the products distribution while increasing reaction rate in accordance to the first-order kinetics.

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Keywords
Selective 3-nitrostyrene hydrogenation; 3-Vinylaniline; Bimetallic catalyst; Pt–Zn alloy; Reactive metal–support interaction
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Increasing Pt selectivity to vinylaniline by alloying with Zn via reactive metal–support interaction
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Publisher
Database: Elsevier - ScienceDirect
Journal: Catalysis Today - Volume 256, Part 2, 1 November 2015, Pages 241–249
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
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Price after discount Only $4.95
100% Money Back Guarantee
Full-text PDF Download
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