Experimental Study Of Gdpe On 1-propanol Solutions And Its Solid Products Analysis

Study on the application of plasmas involved in the fields of physics, chemistry and engineering is always an important topic for theoretical and experimental research. Being one of the important resources of cold plasmas, the glow discharge plays a significant role in urface modification of traditional materials, hydrogen production, induced or enhanced chemical reactions, directly or indirectly generate new material, deposited carbon film and so on. Because of the vagueness on plasmas chemical process and the specific chemical behavior of plasma in applications mentioned above, glow discharge plasma electrolysis(GDPE) on 1-propanol solutions were studied in this paper.The big volume and steady glow discharge plasmas were produced during GDPE on 1-propanol solutions. The characteristic curves of the voltage and current of GDPE on lower alcohols solutions were similar with that of GDPE on the aqueous solutions.Electrons were demonstrated as the most important radicals to trigger the plasma chemical reactions of 1-propanol during GDPE. Molecules of 1-propanol were bombed and excited in glow discharge plasmas and at the interface between plasmas and solutions and produced a lot of active radicals. The processes of GDPE on 1-propanol solutions were investigated by optical emission spectroscopy(OES). The source, energy level transition process and attribution of active species in the plasma field were investigated. The excitation energy of reactive species was related to their lowest excitation energy, the concentration of the electrolyte solutions had little influence on the composition of the plasma active species. The excited order of the plasma active species depended on the energy that the orbit transition of the species needed. The active species in the plasma field were found to undergo dissociation, ionization and excitation.The products of cathode and anode were detected by GC and GC/MS System, solid products were not found in anode GDPE. The main products of 1-propanol were similar with the products in different concentration of 1-propanol. Benzene, toluene and solid products were not appeared when the concentration of 1-propanol below 75%. The main products were analyzed using the molecular bonding energy theory.The differences of GDPE products among methanol, ethanol and 1-propanol solution were analyzed. The main products of gas were Hydrogen, Carbon monoxide, Carbon dioxide and alkanes. Solid products of the GDPE on 1-propanol solution were studied. The composition and structure were characterized by X-ray photo electron spectroscopy, Raman spectrometry and Fourier transformation infrared pecrtrometry. The relative content of sp2, sp3 hybrid carbon in solid products were influenced by discharge voltage and discharge time.