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Low temperature destruction of PCDD/Fs by catalysis coupled with activated carbon

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Abstract

In order to enhance the oxidation and adsorption capacity of catalyst, two kinds of activated carbon (AC) are mechanically mixed with V2O5-WO3/TiO2 catalyst respectively. In this study, the mixtures (M-1: catalyst mixing with AC based on lignite; M-2: the one on coconut shell) are investigated to destroy high concentration (9.8 ng I-TEQ Nm−3) PCDD/Fs at low temperature (160 °C). Adding AC into the catalyst obviously increases removal efficiency (RE) and destruction efficiency (DE). However, M-2 presents higher RE value and lower DE value compared with M-1 at the same conditions as the stronger adsorption capacity of AC based on coconut shell. For the M-2 mixture, RE values are decreasing while DE values show an opposite trend with the ratios of catalyst to AC increasing. Oxygen plays a positive role on the destruction of PCDD/Fs by accelerating the conversion of V4+Ox and V5+Ox. Adjusting oxygen content from 0 to 20 % could increase the DE value from 27.4 to 82.2 % for the M-1 and from 15.8 to 68.9 % for the M-2. In the presence of ozone, a dark brown flock will be generated when the ratio of AC and catalyst is 4:1 due to the reaction between AC and ozone, which results in the lower RE and DE values. The RE and DE values reach the maximum of 96.3 %, 90.6 % in this paper, respectively, when the ratio of AC and catalyst is 1:1 with ozone. Finally, the regenerating of mixture is investigated. Most of dioxin residues in the mixture are desorbed and oxidized by catalysis at 200 °C in the presence of oxygen.

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Acknowledgments

This work is supported by the National Basic Research Development Program of China (973 Program No. 2011CB201500), National High Technology Research and Development Key Program of China (No. 2012AA062803).

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Authors and Affiliations

  1. State Key Laboratory of Clean Energy Utilization, Zhejiang University, Zheda Road 38#, Hangzhou, 310027, China

    Ming-feng Yu, Xiao-dong Li, Tong Chen, Sheng-yong Lu & Jian-hua Yan

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  1. Ming-feng Yu
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  2. Xiao-dong Li
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  3. Tong Chen
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  4. Sheng-yong Lu
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  5. Jian-hua Yan
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Correspondence to Xiao-dong Li.

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Responsible editor: Ester Heath

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Yu, Mf., Li, Xd., Chen, T. et al. Low temperature destruction of PCDD/Fs by catalysis coupled with activated carbon. Environ Sci Pollut Res 23, 5459–5467 (2016). https://doi.org/10.1007/s11356-015-5773-z

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  • DOI: https://doi.org/10.1007/s11356-015-5773-z

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