HYDROGEN PRODUCTION BY GLYCEROL GASIFICATION IN SUPERCRITICAL WATER WITH Na2CO3 AND ZnCl2

摘要

Gasification of glycerol for hydrogen production in supercritical water was studied in a fluidisation bed system with the presence of Na2CO3 and ZnCl2. The influence of main parameters, including temperature, pressure, feedstock concentration and catalyst addition, on the gasification process was discussed. The experiment results show that temperature is the key factor and pressure has a minor effect on glycerol gasification. Higher temperature and pressure are in favour of glycerol gasification. Gasification performance of glycerol decreases with the increasing concentration, and 35 wt.% glycerol was gasified stably during long time operations. Gasification efficiency increases and molar fraction of CO decreases with Na2CO3 addition. ZnCl2 addition has no significant effect on the gasification efficiency, but it improves the selectivity of hydrogen in gas product. It is implied that the supercritical water fluidisation bed system is effective for hydrogen production by biomass gasification.