Showing 3 results for Methane
Volume 18, Issue 45 (6-2008)
Abstract
The experimental studies of methane conversion to higher hydrocarbons and methanol using a dielectric barrier discharge (DBD) reactor are presented in this article. The process is carried out at ambient atmospheric pressure and temperature. The DBD reactor is stimulated by an alternative voltage of 50 Hz and amplitude of max.23Kv. The examination of the effect of voltage and flow rates on methane conversion and product selectivity shows that methane conversion increases linearly by increasing voltage but the product selectivity are in most of the cases independent of voltage. Introducing helium as a third body in methane –electron interaction enhanced methane conversion. When adding oxygen to the feed, the rate of methane conversion increased three times. In low partial pressure of oxygen in the feed and a threshold voltage of 12000 volts, the main product was methanol with a selectivity of 40% and a total yield of 1%.
Volume 18, Issue 45 (6-2008)
Abstract
A proton NMR method for the study of the solvation of alkaline earth cations with methanol (MeOH), ethanol (EtOH) and propanol (PrOH) in nitromethane (NM) as diluent is described. The method is based on monitoring the resonance frequency of alchohols protons as a function of solvent to metal ion mole ratio at constant metal ion concentration. The average solvation number of cation, , at any alchohol/methal ion mole ratio was calculated from the NMR chemical shift-mole ratio data and was plotted against the mole ratio values. The solvation numbers of alkaline earth cations were obtained from the limiting values of the corresponding vs. mole ratio plots. With regard to the results presented, there are increases in the solvation number from Mg2+ to Sr2+ about every alcohols, but decreases in solvation number from methanol to propanol as concerns every metal ion.
Volume 18, Issue 57 (1-2004)
Abstract
Non-catalytic conversion of methane to ethylene and ethane was studied using non-equilibrium positive corona discharge at atmospheric pressure.The total selectivity for C2 hydrocarbons was more than 87% with a yield of 4.8% ethylene. The effect of voltage, temperature, and the ratio of methane to oxygen on methane conversion and selectivity of products at different levels are investigated. The experimental results indicate that the methane conversion increases with increasing the voltage applied to the electrodes. The methane conversion up to 300oC increases but above this temperature depend on feed ratio, it may increase or decrease. The highest methane conversion and C2 yield occures at CH4/O2 = 4/1.In a few experimets smale amounts of COX also was produced.
