Tungstated zirconia catalyzed bromination of phenol red under nearly neutral solution

She Tin Wong, Chi Chau Hwang, Chung Yuan Mou

Research output: Contribution to journalArticlepeer-review

35 Citations (Scopus)

Abstract

The performance of tungstated zirconia catalysts prepared by co-precipitation (WZ) and impregnation (W/m-ZrO2) techniques in phenol red bromination reaction was tested. Both types of catalysts showed excellent activity in this reaction in aqueous solution. The activity of WZ increases as the W loading decreases and the most active 0.6WZ catalyst contained highly dispersed WOx of low surface density on zirconia. The W/m-ZrO2 catalysts showed even higher activity in this reaction but maximum performance is observed for 1.3W/m-ZrO2 instead. The active site for the redox reaction is probably the monomer or dimer of WO x with a single oxo group whereas low surface density of WO x provides enough space on zirconia for the adsorption of phenol red without blocking the redox sites.

Original languageEnglish
Pages (from-to)1-8
Number of pages8
JournalApplied Catalysis B: Environmental
Volume63
Issue number1-2
DOIs
Publication statusPublished - Mar 22 2006
Externally publishedYes

Keywords

  • Bromination
  • EXAFS
  • Mesoporous zirconia
  • Phenol red
  • Tungstated zirconia
  • XPS

ASJC Scopus subject areas

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

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