Effects of H2S, CO2, and O2 on Catalytic Methane Steam Reforming over Ni/CeO2 and Ni/Al2O3 Catalysts

In the present work, the influences of H 2 S and CO 2 on hydrogen production from methane steamreforming reaction over Ni/CeO 2 and Ni/Al 2 O 3 were studied. According to the experiment, both H 2 S andCO 2 inhibited the methane steam reforming rate over both catalysts and consequently resulted in thedecreasing of hydrogen production yield. In the presence of H 2 S (2-10 ppm), the rate dramaticallydecreased due to the sulphidation and cannot be fully recovery even though H 2 S is removed from the feed.At the same operating conditions, Ni/CeO 2 provided higher resistance toward the deactivation than Ni/Al 2 O 3 . CO 2 also presented negative effect on the production of hydrogen from methane steam reformingover both catalysts due to the inhibition of methane and steam adsorption by CO 2 . The adding of oxygenthrough the inlet feed along with methane and steam as the autothermal reforming was also carried out.Oxygen promoted methane steam reforming rate for both catalysts. However, H 2 production from methanesteam reforming decreased with increasing oxygen partial pressure. Keywords : H 2 S / Hydrogen / Methane Steam Reforming / Autothermal Reforming / Fuel Cell