Experimental Study On Preparing Syngas Based On Tungstenic Oxygen Carrier

The technology of chemical looping methane reforming is based on chemical looping technology, which is for the purpose of preparing syngas. The main ingredients of syngas are carbon monoxide and hydrogen. The syngas is used for biological and chemical processing, which is also used for producting industrial methanol. The H2/CO proportion of high quality syngas for producting industrial methanol is 2. Nowadays, the main method of producting syngas is steam reforming of methane. The products are carbon monoxide and hydrogen. The products need to be separated through complicated processes. After complicated processes, the H2/CO proportion can reach 2. The syngas which H2/CO proportion is 2 can be producted directly by chemical looping reforming of methane thecnology. The high quality syngas can be producted directly by reducting high price metal oxide with methane. This method is not only saving energy and convenient, but also can be used for producting hydrogen with the low price metal oxide which is restored by methane. The purpose of recycling metal oxide can be achieved by chemical looping reforming of methane thecnology.In this paper, in order to discover the influence law of preparing syngas by tungstenic oxygen under different reaction conditions, taking advantage of experiment to discover the influence law. Based on the principle of Gibbs minimum free energy, making used of HSC Chemistry 5.1 software to analyze all of the single metal oxide in the periodic table. Through the thermodynamic analysis, there are 13 metal oxides including of tungsten trioxide able to react with methane and steam. They are suitable for being the oxygen carrier of chemical looping methane reforming technology. The WO3 is used as oxygen carrier in this paper.The experiment arrangement is based on 4 factors which are reaction temperature, methane concentration, the type of inert carrier, the added proportion of inert carrier. Adding the ammonium metatungstate hydrate which is the precursor of tungsten trioxide on the ball of inert carrier by impregnation method. The inert carriers are silicon dioxide and aluminium oxide. Producting the oxygen carrier whose added proportion is 2:8,4:6 and 6:4 through desiccation and roast. Which the different types of inert carrier and different added proportion impact on the experiment of preparing syngas can be discovered. In addition, the different reaction temperature, from 800℃ to 1000℃, and the different methane concentration, from 10% to 20%, are investigated at the same time. All of these four factors are changed in the experiment for the purpose of discovering the impaction of preparing syngas.In this paper, there are seven indexes used for estimating whether the experimental condition is good or not. The seven indexes are the rate of deposited carbon, selectivity of carbon monoxide, the reduction rate of tungsten trioxide, the yield of syngas whose H2/CO proportion is 2, the yield of hydrogen, the proportion of effective time, the total reaction time.