Water effect in hydrogen production from methane

✍ Scribed by E. Acha; J. Requies; V.L. Barrio; J.F. Cambra; M.B. Güemez; P.L. Arias

• Publisher: Elsevier Science
• Year: 2010
• Tongue: English
• Weight: 692 KB
• Volume: 35
• Category: Article
• ISSN: 0360-3199
• DOI: 10.1016/j.ijhydene.2010.06.041

✦ Synopsis

Ni/MgO and Ni/Al 2 O 3 catalysts were prepared, by wet impregnation, to compare their performance in hydrogen production from methane CPO, wet-CPO and SR. The catalytic activity was tested at 1073 K, 1 bar and 600e1200 h À1 . Fresh and used catalysts were characterized by different techniques. Both supports, as expected, had a low surface area (27.1 m 2 /g MgO and 6.2 m 2 /g a-Al 2 O 3 ), as determined by BET method. The images obtained with SEM and TEM revealed that the Ni was more dispersed in the MgO support than in the Al 2 O 3 one. By XRD a strong interaction, as solid-solution, between NiO and MgO was found in the 30Ni/MgO and 40Ni/MgO catalysts. The fresh 40Ni/Al 2 O 3 reduced catalyst was partially reduced. But after the activity tests the stability of the reduced Ni became bigger. Some Ni sintering was also observed in the 40Ni/Al 2 O 3 after the wet-CPO and SR tests. The behaviour of the three catalysts was very good in CPO methane conversion (90e93%), but the gradual increase of the steam to carbon ratio, wet-CPO and SR, affected negatively the conversion.