Catalytic Decomposition of Benzene on Supported Nanometer Noble Metal Catalysts

摘要

Regenerative catalytic oxidation of benzene was carried out on lab-made and commercial supported nanometer noble metal catalysts in a fixed bed reactor. The experimental results indicated that the degradation rate of benzene increased obviously with increasing of reaction temperature from 250 to 500 ℃ for benzene catalytic combustion on all catalysts, while it decreased when the space velocity increased. The catalytic activity of Fe/Au-γAl2O3I, II and III catalysts was better than the others including the commercial catalysts. As it turned out, when the amount of Fe/Au-γAl2O3I, II and III supported catalyst is 68.5 mL, reaction temperature is 350 , ℃ the gas hourly space velocity is 2000 h-1, the residual benzene concentration in treated gaseous was less than 12 mg/m3, which is the maximum permitted benzene emission concentration according to the comprehensive emission standard of air pollutants. Benzene was mineralized to CO2 and H2O finally.