Innovative PCDD/F-containing gas stream generating system applied in catalytic decomposition of gaseous dioxins over V2O5-WO3/TiO2-based catalysts

Chia Cheng Yang, Shu Hao Chang, Bao Zhen Hong, Kai Hsien Chi, Moo Been Chang

Research output: Contribution to journalArticlepeer-review

60 Scopus citations

Abstract

Development of effective PCDD/F (polychlorinated dibenzo-p-dioxin and dibenzofuran) control technologies is essential for environmental engineers and researchers. In this study, a PCDD/F-containing gas stream generating system was developed to investigate the efficiency and effectiveness of innovative PCDD/F control technologies. The system designed and constructed can stably generate the gas stream with the PCDD/F concentration ranging from 1.0 to 100 ng TEQ N m-3 while reproducibility test indicates that the PCDD/F recovery efficiencies are between 93% and 112%. This new PCDD/F-containing gas stream generating device is first applied in the investigation of the catalytic PCDD/F control technology. The catalytic decomposition of PCDD/Fs was evaluated with two types of commercial V2O5-WO3/TiO2-based catalysts (catalyst A and catalyst B) at controlled temperature, water vapor content, and space velocity. 84% and 91% PCDD/F destruction efficiencies are achieved with catalysts A and B, respectively, at 280 °C with the space velocity of 5000 h-1. The results also indicate that the presence of water vapor inhibits PCDD/F decomposition due to its competition with PCDD/F molecules for adsorption on the active vanadia sites for both catalysts. In addition, this study combined integral reaction and Mars-Van Krevelen model to calculate the activation energies of OCDD and OCDF decomposition. The activation energies of OCDD and OCDF decomposition via catalysis are calculated as 24.8 kJ mol-1 and 25.2 kJ mol-1, respectively.

Original languageEnglish
Pages (from-to)890-895
Number of pages6
JournalChemosphere
Volume73
Issue number6
DOIs
StatePublished - Oct 2008

Keywords

  • Destruction
  • PCDD/F generating system
  • PCDD/Fs
  • SCR
  • VO-WO/-TiO supported catalyst

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