Catalytic Oxidation Of Oxygenated Volatile Organic Compounds Over Ruthenium-copper Bimetallic Catalysts

Catalytic oxidation is one of the most effective ways to remove oxygenated volatile organic compounds?OVOCs?.In this paper,the effect of different additives on the catalytic activity of ethyl acetate was studied by doping with 1Ru/TiO₂ catalyst.The selectivity,stability,water resistance and universality of 1Ru-5Cu/TiO₂ catalyst were investigated.The catalytic oxidation mechanism of ethyl acetate was also investigated using in-situ FTIR experiment.In addition,the effects of airspeed and inlet concentration on the catalytic activity were studied by a small test platform.The catalytic performance of the prepared catalyst was studied by comparing with the commercial molding catalyst.The obtained results were as follows:?1?The catalytic activity,stability and selectivity of 1Ru/TiO₂ catalyst were improved on doping agent Cu,and the activity of 1Ru-5Cu/TiO₂ catalyst was partly inhibited.?2?The characterization results indicated that Ru-Cu bimetallic catalysts were highly dispersed on TiO₂,where Ru and Cu species had similar distribution and synergistic effect.The oxidation mechanism of ethyl acetate by 1Ru-5Cu/TiO₂ catalyst was proposed.Ethyl acetate was firstly adsorbed on the active site of Ru-Cu catalyst,in which a large amount of ethyl acetate was converted to carboxylate,while a small amount of ethyl acetate was first converted to aldehydes and then to carboxylates.There were a few by-products such as aldehyde in this process and a large number of carboxylates were ultimately converted to CO₂ and H₂O.?3?The experimental results showed that the conversion of ethyl acetate decreased with the increase of the reaction space velocity or the concentration of ethyl acetate.The catalyst activity of the prepared molding catalyst was lower than the commercial Pt-Pd catalyst because of the imperfect preparation process,which indicated the necessary improvement of the preparation process.This work provided experimental and theoretical basis for the application of Ru-based catalysts in industrial catalytic oxidation of OVOCs.