Ni-Mg-La tri-metallic on alumina catalysts for steam reforming of a biomass gasification tar model compound
by Duangduen Atong; Sildara Thassanaprichayanont; Viboon Sricharoenchaikul
International Journal of Materials and Product Technology (IJMPT), Vol. 44, No. 3/4, 2012

Abstract: Magnesium and lanthanum oxide-promoted nickel/α-alumina catalysts were prepared by co- and sequential impregnation. XRD patterns of the catalyst presented main phases of Al₂O₃ and Ni, MgO, NiO, MgNiO₂, (Ni, Mg) Al₂O₄, La₂O₃, La(AlO₃). Metal oxides impregnation did not improved surface area but enlarged size of catalysts. Overall particle sizes and specific surface area were in the range of 14.11 to 40.17 µm and 4.37 to 8.41 m²/g. Steam reforming of toluene as tar model compound was performed at 500 to 800°C. The highest gas production was achieved at 800°C with heating value over 4 MJ/m³ and H₂/CO between 2.49 to 2.77. 5%La₂O₃+5%MgO+10%Ni/Al₂O₃ co-impregnated catalyst exhibited the highest and more stable conversion of around 45% for conversion to CO and more than 60% for conversion to H₂ after 480 min. Among sequential impregnated catalysts, 10%Ni-5%MgO-5%La₂O₃/Al₂O₃ showed early superior conversion but performance rapidly deteriorated after 120 min. Whisker and encapsulating carbon were found on used catalysts at 0.24 to 1.2 wt.% with the highest amount detected on 5%MgO-5%La₂O₃-10%Ni/Al₂O₃.

Online publication date: Wed, 17-Sep-2014

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