These tools will no longer be maintained as of December 31, 2024. Archived website can be found here. PubMed4Hh GitHub repository can be found here. Contact NLM Customer Service if you have questions.


Pubmed for Handhelds

PUBMED FOR HANDHELDS

Search MEDLINE/PubMed

  • Title: [Degradation of PCDD/Fs by the Mixture of V2O5-WO3/TiO2 Catalyst and Activated Carbon].
    Author: Ren Y, Ji SS, Yu MF, Li XD, Yan JH.
    Journal: Huan Jing Ke Xue; 2015 Sep; 36(9):3508-14. PubMed ID: 26717717.
    Abstract:
    The mixture of V2O5-WO3/TiO2 catalyst and two kinds of Activated Carbons (AC) (AC-1: based on lignite; AC-2: based on coconut shell) was used to destroy gas phase PCDD/Fs with high concentration (9. 80 ng.m-3, evaluated by international toxic equivalence quantity (I-TEQ) under low thermal temperature (160°C) based on a dioxin generating system. After mixing with AC, removal efficiency (RE) and destruction efficiency (DE) of PCDD/Fs increased by 20% compared with only catalyst condition. In comparison with mixture of AC based on coconut shell, mixture of AC based on lignite had lower RE-values and higher DE-values. The adjustments of the ratio of catalyst and AC could cause the different degradation effects, and RE-values increased and DE-values decreased with increasing proportions of catalyst. When the volume fraction of oxygen was 0% in experimental atmosphere, catalyst could lose its activity and most PCDD/Fs were not oxidized but adsorbed by the mixture. RE and DE-values increased with increasing content of oxygen. The addition of ozone (concentration of 200 mg.m-3) could improve catalytic oxidation effects to a certain degree. However, ozone might react with AC, which could influence the lifetime of the mixture. Under 200°C, the mixture with proportion of AC: catalyst = 1:1 and in the present of 200 mg.m-3 ozone conditions, the highest RE and DE-value were obtained with 98. 0% and 94. 8% respectively, and the concentration of PCDD/Fs residual in off-gas was only 0. 51 ng.m-3 evaluated by I-TEQ.
    [Abstract] [Full Text] [Related] [New Search]