The production of H-2 via sorption enhanced steam reforming (SE-SMR) of CH4 using 18 wt % Ni/Al2O3 catalyst and CaO as a CO2-sorbent was simulated for an adiabatic packed bed reactor at the reduced pressures typical of small and medium scale gas producers and H-2 end users. To investigate the behaviour of reactor model along the axial direction, the mass, energy and momentum balance equations were incorporated in the gPROMS modelbuilder (R). The effect of operating conditions such as temperature, pressure, steam to carbon ration (S/C) and gas mass flow velocity (G(s)) was studied under the low-pressure conditions (2-7 bar). Independent equilibrium based software, chemical equilibrium with application (CEA), was used to compare the simulation results with the equilibrium data. A good agreement was obtained in terms of CH4 conversion, H-2 yield (wt. % of CH4 feed), purity of H-2 and CO2 capture for the lowest (G(s)) representing conditions close to equilibrium under a range of operating temperatures pressures, feed steam to carbon ratio. At G(s) of 3.5 kg m(-2)s(-1), 3 bar, 923 K and S/C of 3, CH4 conversion and H-2 purity were up to 89% and 86% respectively compared to 44% and 63% in the conventional reforming process. (C) 2018 Hydrogen Energy Publications LLC. Published by Elsevier Ltd. All rights reserved.