| Article ID | Journal | Published Year | Pages | File Type |
|---|---|---|---|---|
| 39522 | Applied Catalysis A: General | 2015 | 12 Pages |
•SRT over CaO doped Ni–Fe alloy supported Al2O3–Fe2O3 catalysts at S/C = 2.•Ni/Ca(1.5)–Fe–Al catalyst gave >80% of toluene conversion for 22 h runtime.•Fe plays a co-catalyst role by forming Ni–Fe alloy particles.•Ni/Ca(1.5)–Fe–Al catalyst can be able to activate H2O at lower temperature than others.•Ni–Fe alloy was confirmed in Ni/Ca(1.5)–Fe–Al catalyst and stable even after 22 h.
CaO doped iron–alumina-supported nickel–iron alloy catalysts were tested in a fixed-bed reactor for steam reforming of toluene as a biomass tar model compound at a relatively low steam-to-carbon (S/C) ratio of 2. The influence of doping CaO to iron–alumina support was also explored for the steam reforming reaction. Ni supported on a CaO(1.5)–Fe2O3–Al2O3 support (Ni/Ca(1.5)–Fe–Al) gave superior catalytic performance in terms of activity and stability over other catalysts. Ni/Ca(1.5)–Fe–Al gave a toluene conversion of more than 80% for a period of 22 h testing at a S/C ratio of 2. XRD analysis showed that the Ni–Fe alloys formed were stable throughout the reforming reaction. It was observed from XPS results that the surface of the reduced Ni/Ca(1.5)–Fe–Al catalyst was enriched with Fe species compared to other catalysts. These enriched surface Fe species play the role of co-catalysts by increasing the coverage of oxygen species during the reforming reaction to enhance the reaction of toluene and to suppress coke formation. The temperature-programmed surface reaction (TPSR) with water reveals that the Ni/Ca(1.5)–Fe–Al catalyst can activate water molecule at relatively lower temperature over other CaO doped catalysts. TGA analysis on spent catalysts reveals that all CaO-containing catalysts generally result in lower carbon formation rates as compared to Ni/Fe–Al catalyst.
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