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Synthesis of WO3/TiO2 catalysts from different tungsten precursors and their catalytic performances in the SCR

  • Journal of the Korean Crystal Growth and Crystal Technology
  • Abbr : J. Korean Cryst. Growth Cryst. Technol.
  • 2014, 24(5), pp.213~218
  • DOI : 10.6111/JKCGCT.2014.24.5.213
  • Publisher : The Korea Association Of Crystal Growth, Inc.
  • Research Area : Engineering > Materials Science and Engineering

BYEONG WOO LEE 1,  이진희 1

1한국해양대학교

Accredited

ABSTRACT

An investigation of the influence of WO3 addition with different precursors and preparation methods on thephase formation and selective catalytic reduction (SCR) efficiency of anatase-TiO2 powders has been carried out. Ananatase-TiO2 synthesized by precipitation process was used as a catalyst support. For WO3(10 wt%)/TiO2, the W loading tothe TiO2 support led to the lower in anatase to rutile transition temperature to ~900oC from 1200oC of the TiO2 supportalone. In the case of WO3(10 wt%)/TiO2 SCR powders obtained from a wet process with ammonium meta-tungstate (AMT)precursor, the highest NOX conversion efficiency was achieved at 450oC remaining high efficiency at 500oC, while thesame composition prepared from a dry process with WO3 addition showed the lowered efficiency with temperature afterreaching the efficiency maximum at 350oC. The same tendency has been found that the V2O5(5 wt%)-WO3(10 wt%)/TiO2SCR powders obtained from the wet process with AMT precursor has shown the superior NOX conversion efficiency over90 % in a wider temperature range of 300~500oC.

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