Reaction Of Methane And Carbon Tetrachloride By Pulsed Corona Plasma Combined With Photocatalysis

Methane as the main component of natural gas,the transformation and utilization of methane in natural gas chemical industry plays a very important position,the development and utilization of low concentration of methane in natural environment has important significance.The traditional production of methyl chloride process,inevitably there are 5% 10% of the by-product carbon tetrachloride?CTC?generation,carbon tetrachloride as one of ozone depleting substances has been limited the use and product.In order to protect the environment and provide new conversion technologies for methane and carbon tetrachloride has important research significance.The investigation of the reaction of methane and carbon tetrachloride by pulsed electrical discharge were carried out,two types of reactor was used: a wire-cylinder reactor and wire-to-plate reactor.The influences of operation parameters such as input power?residence time and carrier gases on the reaction of methane and carbon tetrachloride were investigated.Experimental results showed that the main products from the reaction are chloromethanes?CMS?,which include CH3 Cl,CH2Cl2 and CHCl3,these mainly came from chloride of methane.It was found that with higher power input,the amount of CH3 Cl production decreased,but the amount of CH2Cl2 and CHCl3 production increased.When the concentration of methane was about 10%,CH4/CCl4 mole ratio was 20,excessive amounts of CH4 would affect the compositions and yields of products,and CH3 Cl was the main production of the reaction.Research also compared a wire-cylinder reactor and wire-to-plate reactor,the residence time can increase the nelastic collision probability of methane and carbon tetrachloride with high energy electron,which could help to break chemical bond and form free radicals.CH4/CCl4 mole ratio was fixed at 20,the different concentrations of methane and carbon tetrachloride reaction obviously can be obtained different product distribution;In plasma zone,the different concentration of methane and carbon tetrachloride product different concentration of CH3?,CCl3?,Cl? which obtained different product distribution,in mole percentage of CH3 Cl in chlorinated hydrocarbons increased obviously.It was found decomposition of CH4 and yields of hydrocarbon also increased obviously in Ar compared with that in N2.Plasma combined with Ti O₂ photocatalysis was investigated to study the reaction of methane and carbon tetrachloride.Under the effect of ultraviolet light,the methane adsorption capacity increased to generate highly active C-H adsorption state,the break of C-H bond in photocatalysis and pulse corona plasma forming under the function of active intermediate state-CH3,making more CH3? can be participate in the reaction of methane and carbon tetrachloride and obtained a different hydrocarbon product distribution.