Journal
CHEMICAL ENGINEERING JOURNAL
Volume 375, Issue -, Pages -Publisher
ELSEVIER SCIENCE SA
DOI: 10.1016/j.cej.2019.122027
Keywords
Double dielectric barrier discharge; Non-thermal plasma; Toluene removal; Decomposition mechanism
Categories
Funding
- National Key RAMP
- D Program of China [2017YFC0212204]
- Shaanxi Key RD Program [2018ZDCXL-SF-02-04]
- China Postdoctoral Science Foundation [2018 M643595]
- Natural Science Basic Research Plan in Shaanxi Province of China [2019JQ-177]
- International Science and Technology Cooperation Program in Shaanxi Province [2018KW-011]
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A novel hybrid system was established to degrade adsorbed toluene efficiently. A double dielectric barrier discharge (DDBD) reactor was filled with two common adsorbents, gamma-Al2O3 and ZSM-5, in various combinations. Packing material, high-voltage electrode structure, and gas-flow mode were investigated to optimize this reactor. The reactor packed with a mixture of gamma-Al2O3 and ZSM-5 provided a mineralization rate 6.1% to -14.1% greater than one using a single material. Specifically, the highest mineralization rate was obtained in a DDBD reactor packed with gamma-Al2O3 in the inner tube and ZSM-5 in the outer tube. Using the optimal combination of packing material, two high-voltage electrodes were compared. A higher mineralization rate was observed in the reactor with a rod electrode (63.3%) than in one equipped with a coil electrode (53.7%), The total amounts of O-3 and N2O generated were much less in the reactor with a rod electrode. The effect of gas-flow mode on toluene decomposition was investigated and the result showed that mode 1 (with the gas flowing from the inner tube into the outer tube during both adsorption and discharge phases) could not only improve the degradation of toluene, but could also suppress the generation of O-3 and N2O. A possible mechanism for toluene decomposition in the packed-bed DDBD reactor was proposed based on the analysis of organic intermediates remaining in the adsorbents.
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