Refluxing-coprecipitation to synthesize Fex_Mny/γ-Al2O3 catalyst for toluene removal in a nonthermal plasma-catalysis reactor

摘要

In this study, Fe-x_Mn-y/gamma-Al2O3 catalysts were synthesized by reflux-coprecipitation method, and then these catalysts were characterized by BET, XRD, H-2-TPR, XPS, SEM and TEM. Meanwhile, the toluene removal and secondary pollutants in a nonthermal plasma coupled with Fe-x_Mn-y/gamma-Al2O3 reactor were studied, and then the reaction kinetic model and reaction pathway for the toluene removal were proposed. The results indicated that positive synergistic effect between the plasma and Fe-x_ Mn-y/gamma-Al2O3 catalysts greatly improved the removal performance, and reduced secondary pollutants and activation energy during toluene removal process in the plasma packed with Fe-x_Mn-y/gamma-Al2O3 system. Meanwhile, the plasma packed with the Fe-1_Mn-1/Al2O3 exhibited the highest removal efficiency (98.59%) and CO2 selectivity (88.02%) with the lowest secondary pollutants and activation energy during toluene removal under the SED of 1500 J/L and the GHSV of 80,000 ml g(-1) h(-1). Finally, the toluene removal pathway in the plasma-catalysis system was also discussed based on the identified intermediates and synergistic effect between the plasma and Fe-1_ Mn-1/gamma-Al2O3.

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