Journal
JOURNAL OF CLEANER PRODUCTION
Volume 276, Issue -, Pages -Publisher
ELSEVIER SCI LTD
DOI: 10.1016/j.jclepro.2020.124251
Keywords
In-/post-plasma catalytic system; Dielectric barrier discharge; Toluene; Continuous/sequential process; Reaction mechanism
Categories
Funding
- National Key R&D Program of China [2017YFC0212204]
- Key Research and Development Program of Shaanxi Province [2018-ZDXM3-01]
- Shaanxi Key RD Program [2018ZDCXL-SF-02-04]
- Special Research Project of Education Department of Shaanxi Province [19JK0453]
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In the non-thermal plasma catalysis system, VOCs degradation was significantly affected by the position of the catalyst, as well as operation mode. Hence, it is of great significance to evaluate the performance of In Plasma Catalysis (IPC) and Post Plasma Catalysis (PPC) systems for VOCs abatement using both continuous and sequential processes. Four packed-bed dielectric barrier discharge (DBD) systems were used to degrade toluene with different catalysts under diverse voltages in this study. Results showed that the IPC mineralization rates were higher as compared to PPC, regardless of whether the continuous or sequential processes was used, and irrespective of the applied voltage and type of packed catalyst (e.g. 77.00% and 96.06% in SPPC and SIPC at 20 kV with Ag/ZSM-5 packed). However, PPC was superior to IPC in O-3 and N2O reduction. As the applied voltage was raised, the mineralization rate in different reactors increased significantly, yet CO2 selectivity was insusceptible to voltage variation. NTP alone exhibited a mineralization rate and CO2 selectivity of 9.67%-22.62% and 53.85%-58.26%, respectively. While the mineralization rate and CO2 selectivity were remarkably improved with the presence of Ag/ZSM-5 (19.08%-41.59% and 93.99%-95.91% in CIPC). With respect to different catalysts investigated in this study, at 20 kV, Ag/ZSM-5 exhibited the highest mineralization rate - 96.06% in SIPC, and CO2 selectivity 98.43% in SPPC; while the lowest concentrations of O-3 (198 ppm) and N2O (8.01 ppm) were obtained in the Mn/ZSM-5 packed bed reactor. Possible reaction mechanisms were also proposed by analyzing the organic intermediates that were produced during continuous and sequential treatments, and remained in the adsorbents of IPC and PPC reactors. (C) 2020 Elsevier Ltd. All rights reserved.
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