Hydrogen Production From Methanol Steam Reforming In Non-Thermal Plasma

Methanol is a kind of ideal raw material for hydrogen production, which is cheap, easy to transport and store. In recent years, it has got wide attention. In this work, thermodynamic equilibrium calculation and analysis was conducted firstly, and then we investigated the hydrogen production from methanol steam reforming in spark discharge plasma and DBD plasma hybrid with catalyst separately. The main results are as follows:1. In thermodynamic equlibruium caculation, the effects of temperature and H2O/CH3OH molar ratio were studied.In the scope of temperature and H2O/CH3OH molar ratio that have been investigated, thermodynamic-equilibrium conversion of CH3OH is always100%.At lower temperature (250～400℃), thermodynamic equilibrium products are CH4, CO2and H2. At temperature beyond400℃, CO begins to be produced, and with temperature increasing, H2selectivity and C-based selectivity of CO increase, C-based and H-based selectivity of CH4decrease. When the temperature rises to750℃, there is no CH4to be produced, H2selectivity reaches100%. At temperature beyond750℃, thermodynamic equilibrium products are H2, CO and CO2. With temperature increasing, C-based selectivity of CO increases, C-based selectivity of CO2decreases and H2selectivity remains unchanged.At the same temperature, with H2O/CH3OH molar ratio increasing, H2selectivity and C-based selectivity of CO2increase, C-based selectivity of CO, C-based and H-based selectivity of CH4decrease gradually.2. In experiments, the hydrogen production from methanol steam reforming in spark discharge plasma was investigated. This study mainly explored the effect of technical parameters (electrode distance, input power, CH3OH solution flow rate and H2O/CH3OH molar ratio).Electrode distance8mm was sleeted firstly to investigate the effects of other technical parameters. The results showed that CH3OH conversion increases when input power or H2O/CH3OH molar ratio increase, or CH3OH solution flow rate decreases.It is found that the highest methanol conversion is92%, hydrogen production cost is2.2eV/molecule when H2O/CH3OH molar ratio is1and input power is47W. 3. The hydrogen production from methanol steam reforming in DBD plasma hybrid with Au/CeO2catalyst was investigated.It is found that the CH3OH conversion in DBD plasma hybrid with Au/CeO2catalyst is higher than the sum of which in DBD plasma and in Au/CeO2catalyst separately for the present conditions.