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Journal of Materials Science

, Volume 51, Issue 1, pp 603–614 | Cite as

Pd-based nanoflowers catalysts: controlling size, composition, and structures for the 4-nitrophenol reduction and BTX oxidation reactions

  • Anderson G. M. da Silva
  • Thenner S. Rodrigues
  • Laís S. K. Taguchi
  • Humberto V. Fajardo
  • Rosana Balzer
  • Luiz F. D. Probst
  • Pedro H. C. CamargoEmail author
50th Anniversary

Abstract

We describe herein the synthesis of solid Au@Pd and hollow AgPd nanoflowers displaying controlled sizes and compositions in order to investigate how their size, composition, and the presence of Au in the core of the nanoparticles influence their catalytic performance toward both liquid and gas-phase transformations. While the size and composition of Au@Pd and AgPd the nanoflowers could be controlled as function of growth time, their structure (solid or hollow) was dependent on the nature of the seeds employed for the synthesis, i.e., Au or Ag nanoparticles. Moreover, Au@Pd and AgPd nanoflowers were successfully supported onto commercial silica displaying truly uniform dispersion. The catalytic activities of Au@Pd and AgPd nanoflowers were investigated toward the 4-nitrophenol reduction and the benzene, toluene, and o-xylene (BTX) oxidation. The catalytic activities for the reduction of 4-nitrophenol decreased as follows: Au58@Pd42 > Au27@Pd73 > Ag20Pd80 and Ag8Pd92 > Au12@Pd88 > Ag38Pd62, suggesting that the Au core enhanced the catalytic activity relative to the hollow material when for Pd at.% was up to 80. Regarding the BTX oxidation, supported Au@Pd displayed higher catalytic activities than AgPd nanoflowers, also illustrating the role of the Au cores in the nanoflowers for improving catalytic performance. We believe these results may serve as a platform for the synthesis of Pd-based bimetallic nanomaterials that enable the correlation between these physical/chemical parameters and properties and thus optimized catalytic activities.

Keywords

Sodium Borohydride Flame Atomic Absorption Spectrometry Flame Atomic Absorption Spectrometry AgPd Hollow Interior 
These keywords were added by machine and not by the authors. This process is experimental and the keywords may be updated as the learning algorithm improves.

Notes

Acknowledgements

This work was supported by the Fundação de Amparo à Pesquisa do Estado de São Paulo (FAPESP) (Grant Number 2013/19861-6), the Conselho Nacional de Desenvolvimento Científico e Tecnológico (CNPq) (Grant Number 471245/2012-7). P. H. C. C. and H. V. F. thank the CNPq for the research fellowships. A. G. M. S., L. S. K. T., and T. S. R thank CNPq and CAPES for the fellowships.

Compliance with ethical standards

Conflict of Interest

The authors declare that they have no conflict of interest.

Supplementary material

10853_2015_9315_MOESM1_ESM.pdf (4 mb)
Supplementary material 1 (PDF 4143 kb)

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Copyright information

© Springer Science+Business Media New York 2015

Authors and Affiliations

  • Anderson G. M. da Silva
    • 1
  • Thenner S. Rodrigues
    • 1
  • Laís S. K. Taguchi
    • 1
  • Humberto V. Fajardo
    • 2
  • Rosana Balzer
    • 3
  • Luiz F. D. Probst
    • 3
  • Pedro H. C. Camargo
    • 1
    Email author
  1. 1.Departamento de Química Fundamental, Instituto de QuímicaUniversidade de São PauloSão PauloBrazil
  2. 2.Departamento de QuímicaUniversidade Federal de Ouro PretoOuro PretoBrazil
  3. 3.Departamento de QuímicaUniversidade Federal de Santa CatarinaFlorianópolisBrazil

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