Purification mechanism of hydrogen cyanide by corona discharge and dielectric barrier discharge
Two low-temperature plasma generation methods,corona discharge and dielectric barrier discharge(DBD),are used to purify hydrogen cyanide(HCN),and the reaction mechanisms of the two are discussed.The results show that the purification efficiency of HCN is 76%when the specific input energy(SIE)is 8.3 kJ/L in corona discharge,and 94%when SIE is 11.9 kJ/L in dielectric barrier discharge.By using density functional theory(DFT)to introduce external electric field,Gaussian software is used to calculate and analyze the differences between the two different discharge modes in the HCN purification process.After the introduction of external electric field,the molecular structure and system energy of HCN molecules have changed.In corona discharge,OCN,the intermediate product of HCN conversion,is mainly converted into CO2 and N2,while in dielectric barrier discharge HCN is more easily combined with OH in the system to form H2 O and—CN,and—CN will be polymerized into C3 N4 under the action of high electron and particle density in DBD.
hydrogen cyanidecorona dischargedielectric barrier dischargedensity functional theory
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