Study On The Formation Of HCN In Alkane/Nitrogen Discharge Plasma

Plasma is a gas containing electrons,ions,atoms,and free radicals.Gas discharge is an important way to generate plasma in the laboratory,and it has broad application prospects in many disciplines.Natural gas is rich in hydrocarbons,including saturated alkanes,unsaturated alkynes and unsaturated olefins.The extracted gas usually needs to be converted into value-added products.Hydrogen cyanide(HCN)is one of the products in the process of fuel gas conversion and is extremely toxic.Studying the conditions and mechanism of HCN generation by alkane discharge plasma is very important to control the concentration of HCN in the process of fuel gas conversion.In this paper,glow discharge and dielectric barrier discharge are used to generate discharge plasma on hydrocarbon/nitrogen gas mixture.Wavelength modulation spectroscopy technology is used to detect the product types mainly HCN and C₂H₂.Meanwhile,the concentration of products in plasma is affected by discharge current and parent molecular ratio by laser absorption spectroscopy.Experiments have found that the glow minimum discharge current of alkynes and alkynes is higher than that of saturated alkanes.The production of HCN and C₂H₂ from alkane molecules is related to the C/N ratio in the parent molecule.Combined with the emission spectroscopy technology,this article discusses the difference of products in different regions of hydrocarbon/nitrogen discharge plasma,as well as the difference between saturated alkanes and unsaturated alkynes and alkenes to produce active substances.The experimental technology and data analysis of this experiment provide certain help for further research on the kinetics of the complex reaction of carbon and nitrogen substances.