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Pd nanoparticles prepared by grafting of Pd complexes on phenol-functionalized carbon supports for liquid phase catalytic applications

Paper ID Volume ID Publish Year Pages File Format Full-Text
39949 45840 2014 9 PDF Available
Title
Pd nanoparticles prepared by grafting of Pd complexes on phenol-functionalized carbon supports for liquid phase catalytic applications
Abstract

•An activated carbon was functionalized to introduce phenol groups on its surface.•Palladium was grafted by ligand exchange at the functionalized carbon surface.•Pd/C catalysts were tested in the hydrogenation of 2-methyl-2-nitropropane (MNP).•The activity was enhanced by using carbon with phenol rather than carboxylates groups.•The activity was explained by grafting robustness and possible role of phenols in the reaction.

An activated carbon was functionalized by oxidation with HNO3 or H2O2 to increase the number of acidic groups on its surface. A sample of HNO3-oxidized carbon was treated thermally to remove unstable functions. Detailed characterization by a combination of techniques revealed that this stabilization procedure allowed selecting weaker acid sites of phenolic type. H2O2 functionalization gave also mainly surface phenols but in lower amounts. Palladium grafting was carried out in water at room temperature by ligand exchange between a carboxylate complex and the surface oxygenated groups. Activation was carried out thermally and the samples grafted on the most oxidized supports proved more difficult to reduce. The catalytic activity of the obtained Pd/C catalysts was evaluated in the reduction of 2-methyl-2-nitropropane (MNP) into t-butylamine (TBA). The most active materials were those prepared on H2O2-modified carbon and on the stabilized support. In the latter case, the superior activity was explained by the robustness of the grafting anchors which could not decompose during thermal activation together with the active role of weak acidic groups in the catalytic reaction itself.

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Keywords
Palladium; Activated carbon; Grafting; Hydrogenation; Carboxylate
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Pd nanoparticles prepared by grafting of Pd complexes on phenol-functionalized carbon supports for liquid phase catalytic applications
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Publisher
Database: Elsevier - ScienceDirect
Journal: Applied Catalysis A: General - Volume 474, 22 March 2014, Pages 263–271
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