A thermodynamic analysis of hydrogen production by steam reforming of glycerol

FUEL 154

Sushil Adhikari, sa263@msstate.edu1, Sandun Fernando, sf99@abe.msstate.edu1, Steven R. Gwaltney, drg51@ra.msstate.edu2, and Agus Haryanto, agusharyid65@yahoo.com1. (1) Agricultural and Biological Engineering, Mississippi State University, 100 Moore Road, Mississippi State, MS 39762, (2) Department of Chemistry, Mississippi State University, Box 9573, Mississippi State, MS 39762
Steam reforming of glycerol for hydrogen production involves complex reactions. As a result, several intermediate byproducts are formed, and end up in the product stream affecting final purity of hydrogen produced. Furthermore, the yield of the hydrogen depends on several process variables such as system pressure, temperature, ratio of reactants. The first step to understanding the effects of aforementioned variables is a complete thermodynamic analysis. In this study, a thermodynamic equilibrium analysis has been performed for the steam reforming process of glycerol over the following variable ranges: pressure 1 atm, temperature 600-1000 K and water to glycerol feed ratio 1:1-9:1. The equilibrium concentrations of different compounds were calculated by the method of direct minimization of Gibbs free energy. The study revealed that the best conditions for producing hydrogen is at a temperature >900 K and a molar ratio of water to glycerol of 9:1. Under these conditions, methane production is minimized and the carbon formation is thermodynamically inhibited.