Thermodynamic analysis of hydrogen production from ethanol-glycerol mixture through dry reforming

Z.Y. Zakaria^a,*, M. Jusoh^a, A. Johari^a, M.A.A. Zaini^a, F.H. Kasim^b

Thermodynamic properties of ethanol-glycerol dry reforming have been studied with the method of Gibbs free energy minimization for hydrogen production from ethanol-glycerol mixture. Equilibrium compositions were determined as a function of CO₂/ethanol-glycerol molar ratios (CEG)(1:1-12:1) where ethanol-glycerol is 1:1; reforming temperatures (573-1273 K) at different pressures (1-50 bar). Optimum conditions for hydrogen production are temperatures between 1073 and 1273 K and CEG of 1:1 at 1 bar pressure, whereas temperatures above 1073 K and CEG ratio 1:1 and 1 bar are suitable for the production of synthesis gas. Higher pressure and higher CEG ratio does not encourage hydrogen formation. Under identified optimum conditions, carbon formation can be thermodynamically inhibited

Keywords: ethanol-glycerol mixture, dry reforming, hydrogen production, synthesis gas production