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Processing of Dichloromethane Gas by Catalytic Reduction with Bimetallic Iron Particles

Author: ChengJi
Tutor: JinYiZhong
School: Zhejiang University
Course: Environmental Engineering
Keywords: Reductive dechlorination Dichloromethane Bimetallic iron
CLC: X701.7
Type: Master's thesis
Year: 2011
Downloads: 83
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Abstract


This article configured by laboratory simulation methylene chloride gas was prepared by double metal Ag / Fe , Cu / Fe, Ni / Fe particles with water to absorb the reaction system to deal with methylene chloride gas , explore the pH bimetallic ratio , duration , the impact of the iron powder dosage factors such as methylene chloride emissions between the metallic iron with methylene chloride reductive dechlorination reaction and purification system . Experimental results show that , in a system composed of Ag / Fe, Cu / Fe, Ni / Fe and water , low pH are conducive to the reduction reaction of dechlorination of methylene chloride and iron , pH = 5,7,9 of the Ag / the Fe system dechlorination rates were 6.79% , 3.00% , 1.27 % , lower pH is also conducive to methylene chloride purification system , which may be for several reasons : H involved in the reaction of iron with methylene chloride , the lower system , the pH of the H concentration is high , favorable reaction Forward ; lower pH Fe2 more difficult and OH- generated Fe ( OH ) 2 precipitation , oxidation of the metallic iron is relatively small , more effective reaction sites of the surface of iron Further , advantageously the reaction proceeds ; H2 generated by the reaction of iron with H under acidic conditions may also be involved in the dechlorination reaction of the methylene chloride . The second metal Add to significantly improve the reaction rate of the metallic iron and methylene chloride , to improve the absorption capacity and absorption efficiency of the system dichloromethane . The reaction rate is increased, with the higher proportion of metal and is also found that the in three bimetallic Ag / Fe, Cu / Fe, Ni / Fe , Ni / Fe effect reductive dechlorination of dichloromethane preferably , Ag / Fe - H2O system , followed by worst of the Cu/Fe-H2O system . Increases the duration of the methylene chloride in the system can increase the absorption capacity of the system of the methylene chloride gas , the exhaust gas purifying rate but lower methylene chloride concentration in the absorbing liquid , liquid methylene chloride concentration decreases lead to metallic iron and dichloromethane restore dechlorination reaction rate decreases , the the dechlorination rate decreases . The experiment also investigated Ag / Fe dosage degradation of dichloromethane , found that the amount of degradation of methylene chloride increases with the Ag / Fe investment and increase the amount of increase , Ag/Fe-H2O system dichloro- the the methane exhaust gas purification efficiency With increased. Of iron powder in addition to the reaction between the iron and dichloromethane the purifying effect of the enhancement effect , may also consider the adsorption of the surface of the iron powder of dichloromethane .

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CLC: > Environmental science, safety science > Processing and comprehensive utilization of waste > General issues > Exhaust gas processing and utilization > Other waste gas treatment
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