Study On Synthesizing New Materials By CH₄ And N₂ Plasma At Atmospheric Temperature And Pressure Without Catalyzer

With the lessening of oil and strict environmental protection, the exploitation and using of natural gas, a high-quality, clean, effective energy sources and valuable chemical material, are becoming more and more important in our society. Following the key NSFC Project "Studies on Method and Application of Ionizing Gas Molecules with Strong Electric Field at High Pressure" and the internal and international focus of methane chemical, this paper studies CH4 and N2 plasma synthesis by strong dielectric barrier discharge at room temperature and atmospheric pressure without catalyst.An electric field is formed by strong ionized discharge in the plasma reactor with reduced electric field intensity exceeding 400Td, average electron energy higher than 12eV and electron density more than 1015/cm3. Methane and nitrogen molecules are activated, ionized and dissociated into active particles such as N, N2+, CH3, CH2, CH and H by nonelastic collision with high energy electrons. The particles react each other in the reactor to synthesize chemically products of great additional value including ammonia, hydrocarbon gas and liquid fuel orientationally without any pollution. By changing the physical parameters such as discharge power per area, voltage, frequency and discharge gap and technical parameters such as total flow, volume ratio and gas temperature, we study how these parameters affect the conversion of methane and plasma synthesis. Infrared analyzer, gas chromatograph and mass spectrograph are used to detect the productions in the experiments. The concentration of ammonia reaches up to 8000ppm, yield of liquid fuel conies up to 20 percent and the methane conversion attains 90 percent. And there are 8 kinds of main components in liquid fuel, which belong to higher olefine hydrocarbon, acetylene series, heterocyclic compound and polycyclic organic matter.The experiments use CH4 and N2 as stuff, which are very abundant in the nature, realize green synthesizing of ammonia and liquid fuel at normal temperature and pressure without catalyst, provide a new technology with low energy consumption for natural gas industry, and have important meaning on science and economy.