Multi-pollutant control (MPC) of NO and chlorobenzene from industrial furnaces using a vanadia-based SCR catalyst

NO and chlorobenzene (CB) coexist in the flue gas of industrial furnaces from waste incineration and iron sin tering. We design the strategy to remove them simultaneously via SCR and catalytic combustion together (multipollutant control, MPC). The V5Mo5Ti exhibits excellent activity with 100 % NO conversions in 200-400 degrees C and 95 % CB conversions above 300 degrees C. 2,3-dichloromaleic anhydride (DCMA) and acetate are the primary intermediates during the CB oxidation, while the sum of 17 kinds of PCDD/Fs on the V5Mo5Ti is 0.0115 ng.ITEQ.Nm(-3). Partial DCMA is not deeply oxidized into CO2, reducing the COx selectivity below 350 degrees C. The final products of the accumulated species above 800 degrees C desorption are CCl4 and C2Cl4, generated from the hydrogenation of intermediates. The Cl desorption mainly occurs in two zones: HCl in 200-500 degrees C from CB oxidation and CCl4 and C2Cl4 above 800 degrees C from surface hydrocarbon decomposition.

Automated summary

The study successfully removed NO and CB from industrial flue gas simultaneously using SCR and catalytic combustion. The V5Mo5Ti catalyst exhibited excellent activity in the temperature range of 200-400 degrees Celsius, resulting in the oxidation of 17 kinds of PCDD/Fs during the process of CB oxidation.