Preparation of well-crystallized Pd20Te7 alloy nanoparticulate catalysts with uniform structure and composition in liquid-phase

Hideyuki Takahashi, Norikazu Konishi, Hironobu Ohno, Kazunari Takahashi, Yuichiro Koike, Kiyotaka Asakura, Atsushi Muramatsu

Research output: Contribution to journalArticlepeer-review

7 Citations (Scopus)

Abstract

The synthesis system of uniform and well-crystallized alloy nanoparticulate catalysts has been studied based on the calculation of pH dependent metal complex concentrations in an aqueous solution. Results of both the prediction based on calculation and EXAFS analysis clearly demonstrated that [Pd 2+(EDTA)] and Te-citric acid complex species were generated independently in the solution. Since the formations of metal complexes are restricted to [Pd2+(EDTA)] and Te-citric acid complexes in the pH range between 5 and 10, only Pd20Te7 was successfully synthesized when the reducing agent was introduced into the [Pd 2+(EDTA)] complex/Te-citric acid complex system at room temperature. Moreover, PdTe nanoparticles can be synthesized predominantly in pores of silica-gel by controlling the temperature of the Pd-EDTA/Te-citric acid/hydrazine mixed solution with a metal loading of 0.5 wt% Pd. The main phase of the well-crystallized alloy nanoparticles formed in the pores was Pd 20Te7, leading to remarkable stability in catalytic activity, compared with those of the conventional catalysts.

Original languageEnglish
Pages (from-to)80-85
Number of pages6
JournalApplied Catalysis A: General
Volume392
Issue number1-2
DOIs
Publication statusPublished - 2011 Jan 29

Keywords

  • Metal complexes
  • Predicted concentration
  • Uniform composition
  • Uniform structure
  • Well-crystallized PdTe alloy nanoparticles

ASJC Scopus subject areas

  • Catalysis
  • Process Chemistry and Technology

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