A comparative study on hydrogen production from steam-glycerol reforming: thermodynamics and experimental

Abstract

A detailed comparative study on thermodynamic and experimental analyses of glycerol reforming for hydrogen production has been conducted in terms of the effects of temperature, pressure, water to glycerol feed ratio, feeding reactants to inert gas ratio and feeding gas flow rate (residence time). The thermodynamic analysis was conducted by using a non-stoichiometric methodology based on the minimisation of Gibbs free energy. And the experiments were carried out with a pilot scale set-up. The results show that the thermodynamic and experimental data agree fairly well with each other. The measured hydrogen production is slightly lower than that predicted by the thermodynamic analysis, which is mainly because the conversion of steam is incomplete. High temperature, low pressure, low feeding reactants to inert gas ratio and low gas flow rate are favourable for steam reforming of glycerol for hydrogen production. There is an optimal water to glycerol feed ratio for steam reforming of glycerol for hydrogen production which is about 9.0. The glycerol conversion is a strong function of water to glycerol ratio, whereas a weak function of other parameters over the conditions of this work. A novel adsorption enhanced reaction process incorporating water and heat recovery is proposed for further optimisation of hydrogen production from steam reforming of glycerol.