Thermodynamic analysis of hydrogen production from dimethyl ether steam reforming

The thermodynamic analysis of hydrogen production from dimethyl ether (DME) steam reforming was carried out in order to study the influences of temperature, pressure, the mole ratio of steam to DME (S/D) on equilibrium composition. The equilibrium DME conversion and hydrogen fraction in the reaction system were analyzed. The results show that DME conversion increases with the increase of S/D and temperature, and reduces with the increase of pressure. The concentration of hydrogen decreases with the increase of temperature and pressure, and increases first and then reduces with the increase of S/D. The complete conversion of DME, higher yield and selectivity of hydrogen, and lower concentration of carbon monoxide and methanol in product can be obtained in follow reaction condition ranges: S/D of 3～6, temperature of 200～300℃ and pressure of 0.1MPa.