Hydrogen rich fuel gas production by gasification of wet biomass using a CO2 sorbent

Abstract Hydrogen rich fuel gas production by gasification of wet biomass accompanied by CO 2 absorption is proposed. The paper addressed this topic, and experiments were conducted to investigate the effects of the moisture content ( M ), the molar ratio of Ca(OH) 2 to carbon in the biomass ([Ca]/[C]) and the reactor temperature ( T ) on hydrogen production and CO 2 absorption by CaO. Measurement of the calcium compounds in solid residues was carried out with XRD and SEM. The results show that directly gasifying of wet biomass not only favors hydrogen production but also promotes CO 2 absorption by CaO. For the experiment with wet biomass ( M  = 0.90), the H 2 yield is increased by 51.5% while the CO 2 content is decreased by 28.4% than that for experiments with dry biomass ( M  = 0.09). CaO plays the dual role of catalyst and sorbent. It is noteworthy that CaO reveals a stronger effect on the water gas shift reaction than on the steam reforming of methane. The increase of the reactor temperature contributes to produce more H 2 , but goes against CO 2 absorption by CaO. XRD spectrum and SEM image of the solid residues further confirmed that high temperature is unfavorable to CO 2 absorption by CaO. For the new method, the optimal operating temperature is in the 923–973 K range.

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