A Study On The Partial Oxidation Of Methane To Mxygenous Compound

Natural gas, which main component is methane, is one of the most important raw materials. It is used to synthesize methanol or ammonia through an indirect way of which the syngas is produced firstly. This paper explores a direct way of using natural gas and develops a high-effective catalyst system that can directly change methane into oxygenated hydrocarbons under mild reaction conditions. The oxygenated hydrocarbons are liquid under normal pressure and temperature and their chemical properties are stable, so they can be transported conveniently. The experiment has utilized three-phase system and semi-continuous operation into the reaction for the first time. The gas phase is continuous and the liquid and solid phases are both intermittent. The active carbon is used to load heteropoly acids as the carrier and air is used as the oxidant. This reaction system solves the problem existed in gas-solid or gas-liquid reaction system such as the high cost of the equipments in those systems and the low selection of oxygenated hydrocarbons. The catalytic properties of active carbon loading different heteropoly acid and other substances have been studied in this paper and a more appropriate catalytic systems is established based on the experiment results.The solid phase is the active carbon loading H3O40PMo12 and Na3VO4 and liquid phase contains some amount of the Co(Ac)2 in the new system. In those catalytic systems, the conversion of methane reaches higher level. Meanwhile the catalytic systems have been optimized, and a higher conversion is achieved. In the catalytic systems, the charge number of H3O40PMo12 reach 30%, and the mole ratio of H304oPMo12 and Na3VO4 is 1:3, the suitable molarity of Co(Ac)2 is 1.68xlO-2mol/L. Finally, the experiment studies the impact of the changes of pressure, temperature and other impact factors to the methane oxidation reaction. The results show that the ratio of the solution has significant influence on the conversion of methane.The pressure, the temperature and the gas flow also have some effect on the conversion. When the reaction process conditions are optimized, methane conversion can achieve 6.67%, so the catalytic systems have further research value.