Abstract
Nanocomposite Ni/ZrO 2-AN catalyst consisting of comparably sized Ni metal and ZrO 2 nanoparticles is studied in comparison with zirconia- and alumina-supported Ni catalysts (Ni/ZrO 2-CP and commercial Ni/Al 2O 3-C) for steam reforming of methane (SRM) and for combined steam and CO 2 reforming of methane (CSCRM). The reactions are performed under atmospheric pressure with stoichiometric amounts of H 2O and CH 4 or (H 2O + CO 2) and CH 4 at 1073 K. Under a wide range of methane space velocity (gas hourly space velocity of methane GHS V C H 4 = 12,000–96,000 ml/(h g cat.), the nanocomposite Ni/ZrO 2-AN catalyst always shows higher activity and stability for both SRM and CSCRM reactions. The two supported Ni catalysts (Ni/ZrO 2-CP and Ni/Al 2O 3-C) exhibit fairly stable catalysis under low GHS V C H 4 but they are easily deactivated under high GHS V C H 4 and become completely inactive when they are reacted for ca.100 h at GHS V C H 4 = 48,000 ml/(h g cat.). The CSCRM reaction is carried out with different H 2O/CO 2 ratios in the reaction feed while keeping the molar ratio (H 2O + CO 2)/CH 4 = 1.0, the results prove that the nanocomposite Ni/ZrO 2-AN catalyst can be highly promising in enabling a catalytic technology for the production of syngas with flexible H 2/CO ratios (ca. H 2/CO = 1.0–3.0) to meet the requirements of various downstream chemical syntheses.
Published Version
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