Supercritical water gasification of crude glycerol for hydrogen (H2) production is one possible use of crude glycerol from biodiesel production. In this study, a series of central composite designed experiments were conducted to investigate the reforming of crude glycerol for producing a H2 rich gas. A mathematical model defining the effect of glycerol concentration, reaction temperature and KOH concentration was developed with response surface methodology and was used to improve the H2 yield. The study revealed that the optimum reaction conditions for producing H2 were 500°C, 7wt.% glycerol concentration and 2.39molL-1 KOH concentration. The corresponding pressure was 45MPa. Under these optimized reaction conditions, the H2 mole fraction yield in the gaseous product was 27.9±0.22mol%. The mole fraction yields of other gas products (CH4, CO and CO2) were small compared to that of H2.
- Crude glycerol
ASJC Scopus subject areas
- Renewable Energy, Sustainability and the Environment
- Nuclear Energy and Engineering
- Fuel Technology
- Energy Engineering and Power Technology