Seed-mediated synthesis of dendritic platinum nanostructures with high catalytic activity for aqueous-phase hydrogenation of acetophenone

This work reports a facile and efficient seed-mediated method for the synthesis of dendritic platinum (Pt) nanoparticles (NPs) at low temperatures of 55-60 ℃ in water, using L-ascorbic acid as a reducing agent and sodium citrate as a capping agent. It is found that the dendritic Pt NPs (10-150 nm) a...

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Published inJournal of energy chemistry Vol. 24; no. 5; pp. 660 - 668
Main Authors Yuan, Yuan, Kaneti, Yusuf Valentino, Liu, Minsu, Jin, Fangzhu, Kennedy, Danielle Frances, Jiang, Xuchuan, Huang, Jun, Yu, Aibing
Format Journal Article
LanguageEnglish
Published Elsevier B.V 01.09.2015
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Summary:This work reports a facile and efficient seed-mediated method for the synthesis of dendritic platinum (Pt) nanoparticles (NPs) at low temperatures of 55-60 ℃ in water, using L-ascorbic acid as a reducing agent and sodium citrate as a capping agent. It is found that the dendritic Pt NPs (10-150 nm) are composed of tiny Pt nanocrystals, which nucleate and grow through the introduced smaller Pt seeds with diameters of 3-5 nm. Further investigation shows that the dendritic Pt nanostructures display excellent catalytic performance in an aqueous-phase aromatic ketone hydrogenation reaction, including: (i) acetophenone conversion rate of 〉 90%, with smaller dendritic Pt NPs (10-46 nm) offering a higher conversion efficiency; (ii) high chemoselectivity toward carbonyl group (90.6%-91.5%), e.g., the selectivity to l-phenylethanol is -90.1% with nearly 100% acetophenone conversion for 10 nm dendritic Pt NPs within 60 rain, under mild reaction conditions (20 ℃, 1.5 bar H2 pressure, and 1.5 tool% catalyst). The high catalytic activity, selectivity and stability of the dendritic Pt nanostructures under the organic solvent-free conditions make them promising for many potential applications in green catalytic conversion of hydrophilic biomass derived compounds.
Bibliography:Dendritic Pt nanoparticles Aqueous-phase hydrogenation Acetophenone conversionSeed mediated synthesis
This work reports a facile and efficient seed-mediated method for the synthesis of dendritic platinum (Pt) nanoparticles (NPs) at low temperatures of 55-60 ℃ in water, using L-ascorbic acid as a reducing agent and sodium citrate as a capping agent. It is found that the dendritic Pt NPs (10-150 nm) are composed of tiny Pt nanocrystals, which nucleate and grow through the introduced smaller Pt seeds with diameters of 3-5 nm. Further investigation shows that the dendritic Pt nanostructures display excellent catalytic performance in an aqueous-phase aromatic ketone hydrogenation reaction, including: (i) acetophenone conversion rate of 〉 90%, with smaller dendritic Pt NPs (10-46 nm) offering a higher conversion efficiency; (ii) high chemoselectivity toward carbonyl group (90.6%-91.5%), e.g., the selectivity to l-phenylethanol is -90.1% with nearly 100% acetophenone conversion for 10 nm dendritic Pt NPs within 60 rain, under mild reaction conditions (20 ℃, 1.5 bar H2 pressure, and 1.5 tool% catalyst). The high catalytic activity, selectivity and stability of the dendritic Pt nanostructures under the organic solvent-free conditions make them promising for many potential applications in green catalytic conversion of hydrophilic biomass derived compounds.
21-1585/O4
ISSN:2095-4956
DOI:10.1016/j.jechem.2015.09.001