In order to enhance energy recovery efficiency from MSW (municipal solid waste), an in-situ steam gasification method for hydrogen production where CaO was used as CO2 sorbent and catalyst in the process was proposed. The effects of moisture content, the molar ratio of CaO to carbon in wet MSW ([Ca]/[C]) and reactor temperature on H-2 yield and gas composition were investigated. The results showed that maximum hydrogen volumetric concentration (49.42 vol%) and hydrogen yield (277.67 ml/g MSW) were obtained at 40 wt.% moisture content at gasification temperature of 750 degrees C and [Ca]/[C] ratio of 0.7. The proposed direct gasification of wet MSW with in situ CO2 capture process may be a promising route to produce hydrogen rich fuel gas using MSW. (C) 2015 Elsevier Ltd. All rights reserved.