Abstract
Hydrogen gas is a clean and sustainable fuel/energy carrier considered to be a possible alternative to fossil fuels. Sorption enhanced biogas steam reforming is a process which combines a CO 2 adsorption unit with a hydrogen production unit. In the CO 2 sorption section, CaO was selected as the adsorbent due to its high stoichiometric adsorption capacity. From the adsorption test, the highest adsorption capacity (0.2849 gCO 2 /gCaO) was achieved at a temperature of 873 K. Four types of bed arrangement were investigated using a feed gas with a CH 4 /CO 2 ratio of 1.5, an S/C ratio of 3, a temperature of 873 K and at atmospheric pressure. The results indicate that the Type II system (Catalyst physical mixed with sorbent system packed in fixed bed quartz reactor, 0.8 g of 12.5 wt.% Ni/Al 2 O 3 mixed with 2 g of CaO) exhibits the highest improvement in CH 4 conversion with the introduction of CO 2 adsorption (93.0% and 81.7%, with and without CO 2 sorption, respectively) and high purity hydrogen was produced (97.0% v/v and 62.3% v/v, with and without CO 2 sorption respectively).
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