Thermodynamic Analysis of Hydrogen Production from Ethanol-glycerol Mixture through Steam and Dry Reforming

摘要

Thermodynamic properties of ethanol-glycerol steam and dry reforming have been studied with the method of Gibbs free energy minimization for hydrogen production. Equilibrium compositions were determined as a function of H 2 O/ethanol-glycerol molar ratios (WEG)(1:1-12:1) for ethanol-glycerol steam reforming and CO 2 /ethanol-glycerol molar ratios (CEG)(1:1-12:1) for ethanol-glycerol dry reforming where ethanol-glycerol is 1:1; reforming temperatures at 573-1273 K and 1 bar pressure. Production trends for H 2 , CO, CO 2 and C were compared between both steam and dry glycerol reforming. Steam reforming (WEG 1:1) produced the highest H 2 (4.2 kmol) at 1173K. Dry reforming produced higher CO and CO 2 compared to steam reforming. Higher WEG and CEG ratio did not encourage hydrogen formation. Carbon formation could be thermodynamically inhibited better when steam reforming is employed.