Can TiO2 promote the reduction of nitrates in water?

Jacinto De Paiva Sa, T. Berger, K. Fottinger, A. Riss, James Arthur Anderson, H. Vinek

Research output: Contribution to journalArticle

74 Citations (Scopus)

Abstract

Monometallic palladium catalysts were synthesized using different titanium supports and tested for the reduction of nitrates from aqueous solutions using hydrogen as a reductant. The Pd/TiO2 catalysts were characterized by electron paramagnetic resonance (EPR), low-temperature Fourier transform infrared (FTIR) spectroscopy of adsorbed CO, and X-ray diffraction (XRD). The catalysts studied exhibited a high activity for nitrate removal with a lower tendency for nitrite formation than the conventional bimetallic Pd catalysts. Although ammonium formation was greater than desired, the use of a monometallic catalyst for this two-step reduction process is significant and suggests that a single site may be responsible for both reduction stages. The titanium support (particularly the Ti3+ centers generated during prereduction in the presence of Pd) appear to play an important role in the nitrate degradation process. The potential role of Pd beta-hydride in generating these Ti3+ centers is discussed. (c) 2005 Elsevier Inc. All rights reserved.

Original languageEnglish
Pages (from-to)282-291
Number of pages9
JournalJournal of Catalysis
Volume234
DOIs
Publication statusPublished - Jun 2005

Keywords

  • Pd/TiO2
  • low-temperature Fourier transform infrared spectroscopy
  • nitrate reduction
  • aqueous solutions
  • METAL-SUPPORT INTERACTION
  • ELECTRON-PARAMAGNETIC-RES
  • PD-CU CATALYSTS
  • DRINKING-WATER
  • SELECTIVE HYDROGENATION
  • PD/TIO2 CATALYSTS
  • CARBON-MONOXIDE
  • CO ADSORPTION
  • PALLADIUM
  • TITANIUM

Cite this

Sa, J. D. P., Berger, T., Fottinger, K., Riss, A., Anderson, J. A., & Vinek, H. (2005). Can TiO2 promote the reduction of nitrates in water? Journal of Catalysis, 234, 282-291. https://doi.org/10.1016/j.jcat.2005.06.015