Increase of Hydrogen Concentration by Non-Equilibrium State Using Ba₂TiO₄

Abstract

We tested the use of Ba₂TiO₄ to remove CO₂ from steam reforming gas of CH₄ and thereby increase the concentration of H₂ in the gas. The results of passing reforming gas through a reactor filled with a CO₂ absorbent based on Li₄SiO₄ ceramics at 600 to 700°C demonstrated that the concentrations of CO₂ and CO were reduced, while the H₂ concentration was increased to about 95%, by the progression of the water shift reaction. At a temperature of 650°C or less, or a space velocity of 250 h^–1 or less, the use of a shift reactor might not be necessary after the reforming because the CO concentration was less than 2000 ppm.