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Palladium (0) metal clusters: Novel Krebs type polyoxoanions stabilized, extremely active hydrogenation catalyst

Paper ID Volume ID Publish Year Pages File Format Full-Text
40404 45852 2013 10 PDF Available
Title
Palladium (0) metal clusters: Novel Krebs type polyoxoanions stabilized, extremely active hydrogenation catalyst
Abstract

One-pot synthetic route has been applied for successful synthesis and stabilization of Pd, Au and Ag metal-clusters (Metal-clusters can be defined as nanoparticles of size less than 10 nm.) using Krebs type polyoxoanions [(TBA)4H4[M4(H2O)10(XW9O33)2], where M = Mn, Ni, Zn, X = Te, Se; M = Fe, X = Sb, As] as stabilizers. These polyoxoanions falls under the category of heteropolyanions and possess Krebs structure. All the polyoxoanion-metal colloidal systems were found to be stable for approximately three/six months in solution media. It was found that, due to some kind of structural transformation, polyoxoanions loose their stabilizing capability.Polyoxoanions stabilized Pd metal-clusters was found to be extremely active toward hydrogenation reaction of cyclohexene and 1-hexene. The Pd-Mn4Se2W18 system demonstrated the longest lifetime of up to 250,000 for 1-hexene and 100,000 for cyclohexene hydrogenation. The catalytic activity is found to vary with transition metal ions like Mn, Fe, Ni, Zn, As, Sb, Te, Se which are present in the polyoxoanions. All the metal-cluster systems were characterized using various instrumental techniques such as UV–vis spectroscopy, FTIR spectroscopy, X-ray diffraction, energy dispersive spectroscopy, X-ray photoelectron spectroscopy and transmission electron microscopy.

Graphical abstractFigure optionsDownload full-size imageDownload high-quality image (174 K)Download as PowerPoint slideHighlights► Pd, Au and Ag metal-clusters have been synthesized by chemical reduction method. ► Krebs type polyoxoanions were employed as stabilizers. ► All colloidal system found to be very stable for up to six months. ► The Pd-Mn4Se2W18 system showed the longest lifetime of up to 250,000 for 1-hexene. ► Catalytic activity varies with the transition metal ions present in the polyoxoanion.

Keywords
Pd; Au and Ag metal-clusters; Polyoxoanions stabilizers; Krebs polyoxoanions; Hydrogenation
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Publisher
Database: Elsevier - ScienceDirect
Journal: Applied Catalysis A: General - Volume 453, 26 February 2013, Pages 262–271
Authors
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Subjects
Physical Sciences and Engineering Chemical Engineering Catalysis
Get Full-Text Now
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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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