Journal
JOURNAL OF HAZARDOUS MATERIALS
Volume 405, Issue -, Pages -Publisher
ELSEVIER
DOI: 10.1016/j.jhazmat.2020.124156
Keywords
Plasma catalysis; Perovskite; Synergy effect; Reactive oxygen species; Toluene
Categories
Funding
- National Key Research and Development Project of Research [2017YFC0212805]
- National Natural Science Foundation of China [51878292]
- Natural Science Foundation of Guangdong Province, China [2015B020236002]
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The Ba1-xCexTiO3 perovskite catalysts prepared by Ce-doping strategy showed efficient catalytic decomposition of toluene and significant synergy when combined with nonthermal plasma. Superoxides were identified as the primary reactive oxygen species generated reversibly on the catalyst surface via an electron transfer process, enhancing the heterogeneous surface plasma reactions.
The insights on the primary surface-reactive oxygen species and their relation with lattice defects is essential for designing catalysts for plasma-catalytic reactions. Herein, a series of Ba1-xCexTiO3 perovskite catalysts with high specific surface areas (68.6-85.6 m(2)g(-1)) were prepared by a facile in-situ Ce-doping strategy and investigated to catalytically decompose toluene. Combining the catalysts with a nonthermal plasma produced a significant synergy effect. The highest decomposition efficiency (100%), COx selectivity (98.1%), CO2 selectivity (63.9%), and the lowest O-3 production (0 ppm) were obtained when BC4T (Ce/Ti molar ratio = 4:100) was packed in a coaxial dielectric barrier discharge reactor at a specific input energy of 508.8 J L-1. The H-2-TPR, temperature-programmed Raman spectra, EPR and OSC results suggested that superoxides (center dot O-2(-)) were the primary reactive oxygen species and were reversibly generated on the perovskite surface. Molecular O-2 was adsorbed and activated at the active sites (Ti3+-V-o) via an electron transfer process to form center dot O-2(-) Surface-adsorbed center dot O-2(-) had a greater effect on the heterogeneous surface plasma reactions than the dielectric constant, and enhanced the toluene decomposition and intermediate oxidation. A possible reaction path of toluene decomposition was also proposed.
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