Toluene degradation by non-thermal plasma combined with a ferroelectric catalyst

摘要

Degradation of toluene in a gas by non-thermal plasma with a ferroelectric catalyst was studied at normal temperature and atmospheric pressure. Spontaneous polarization material (BaTiO_3) and photocatalyst (TiO_2) were added into plasma system simultively. Toluene degradation efficiency and specific energy density during the discharge process were investigated. Furthermore, byproducts and degradation mechanisms of toluene were also investigated. The toluene degradation efficiency increased when non-thermal plasma technology was combined with the catalyst. The toluene degradation efficiencies of the different catalysts tested were in the following order: BaTiO_3/TiO_2 > BaTiO_3 > TiO_2 > no catalyst. A mass ratio of 2.38:1 was optimum for the BaTiO_3 and TiO_2 catalyst. The outlet gas was analyzed by gas chro-matography and Fourier transform infrared spectroscopy, and the main compounds detected were CO_2, H_2O, O_3 and benzene ring derivatives.