Catalytic evaluation of dendrimer-templated Pd nanoparticles in the reduction of 4-nitrophenol using Langmuir-Hinshelwood kinetics

Ji Hyang Noh, Reinout Meijboom

Research output: Contribution to journalArticlepeer-review

80 Citations (Scopus)

Abstract

This study aimed to produce well-defined palladium nanoparticles using a dendrimer template technique and investigate their catalytic behavior through intensive kinetic evaluation using 4-nitrophenol (4-Nip) reduction as a model reaction. Three dendrimers, generation 4, 5, and 6 hydroxyl terminated poly(amidoamine) dendrimers, G4-OH, G5-OH, and G6-OH were used as templates, while metal to dendrimer ratios of 40, 80, and 160 were used for the G4-OH, G5-OH, and G6-OH dendrimers, respectively. The average diameters obtained for dendrimer-templated G4-OH(Pd40), G5-OH(Pd80), and G6-OH(Pd160) nanoparticles were 2.35 ± 0.58 nm, 2.02 ± 0.45 nm, and 2.21 ± 0.31 nm, respectively. Kinetic evaluation of the 4-Nip reduction catalyzed by the Pd nanoparticles was performed under various experimental conditions, such as various concentrations of the catalysts, 4-Nip, NaBH4, and various temperatures. The highest catalytic activity was obtained by using G6-OH(Pd160) catalyst. The adsorption equilibrium constants of 4-Nip (KNip) and borohydride (KBH4-) obtained by data fitting to the Langmuir-Hinshelwood equation as well as the activation parameters such as enthalpy of activation (ΔH), entropy of activation (ΔS), and activation energy (EA) obtained by Eyring and Arrhenius equations are reported.

Original languageEnglish
Pages (from-to)400-413
Number of pages14
JournalApplied Surface Science
Volume320
DOIs
Publication statusPublished - 30 Nov 2014

Keywords

  • 4-Nitrophenol reduction
  • Activation parameters
  • Dendrimer-templated
  • Hydroxyl terminated PAMAM dendrimer
  • Langmuir-Hinshelwood parameters
  • Pd nanoparticles

ASJC Scopus subject areas

  • General Chemistry
  • Condensed Matter Physics
  • General Physics and Astronomy
  • Surfaces and Interfaces
  • Surfaces, Coatings and Films

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