Steam-methane reforming is the main method for hydrogen production, but the hydrogen purity usually influenced by CO and CO_2 of tail gas. To improve the hydrogen purity, some researches tried to add the adsorbent into the reactor (Ding & Alpay (2000), Hildenbrand et al.(2006), Johnsen et al. (2006), Lee et al. (2004), Lucr'edio & Assaf (2006), Ochoa-Ferna'ndez et al. (2005), Xiu et al. (2002), Xiu et al. (2003a), and Xiu et al. (2003b)), which is called adsorption-enhanced steam-methane reforming reaction. As CO_2 is adsorbed by adsorbent, the steam-methane reforming will be still processing and the hydrogen purity will be improved.
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