US EPA

1138323 

Journal Article 

A thermodynamic analysis of hydrogen production by steam reforming of glycerol 

Adhikari, S; Fernando, S; Gwaltney, SR; To, SDF; Bricka, RM; Steele, PH; Haryanto, A 

2007 

Yes 

International Journal of Hydrogen Energy
ISSN: 0360-3199 

Elsevier 

32 

14 

2875-2880 

10.1016/j.ijhydene.2007.03.023 

WOS:000250287300031 

https://linkinghub.elsevier.com/retrieve/pii/S0360319907001735
Exit
 

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 the hydrogen produced. Furthermore, the yield of the hydrogen depends on several process variables, such as system pressure, temperature, and ratio of reactants. The first step to understanding the effects of the 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 1–5atm, temperature 600–1000K, 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 the Gibbs free energy. The study revealed that the best conditions for producing hydrogen is at a temperature >900K, atmospheric pressure, 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. 

Gibbs free energy; minimization; glycerol; hydrogen