Monometallic Pd/Fe 3O 4 catalyst for denitrification of water

Wuzhu Sun, Qi Li, Shian Gao, Jian Ku Shang

Research output: Contribution to journalArticlepeer-review

Abstract

A magnetite supported monometallic Pd catalyst was synthesized by a co-precipitation process followed with the reduction in pure hydrogen at 453K. The catalyst was composed of ultrafine Pd nanoparticles (∼2nm) highly dispersed on the surface of superparamagnetic Fe 3O 4 nanoparticles. Aside from its roles as the catalyst support and the magnetic separation medium, Fe 3O 4 was found to be a good promoter for the nitrate reduction, where nitrate was firstly reduced to nitrite by the Fe(II)/Fe(III) redox couple, and subsequently reduced to nitrogen and ammonium. Further mechanistic studies demonstrated that besides the Pd sites, active sites for the nitrite reduction also exist on the surface of Fe 3O 4. Part of the nitrite reduction occurred on the surface of Fe 3O 4, which may also be attributed to the Fe(II)/Fe(III) redox couple. In the present study, ammonium was the main product because of the different denitrification mechanisms compared with bimetallic catalysts.

Original languageEnglish (US)
Pages (from-to)1-9
Number of pages9
JournalApplied Catalysis B: Environmental
Volume125
DOIs
StatePublished - Aug 21 2012

Keywords

  • Catalytic denitrification
  • Fe(II)/Fe(III) redox couple
  • Pd/Fe O
  • Superparamagnetic catalyst

ASJC Scopus subject areas

  • Catalysis
  • Environmental Science(all)
  • Process Chemistry and Technology

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