Abstract
The pre-reforming of commercial liquefied petroleum gas (LPG) was investigated over Ni–CeO 2 catalysts at low steam to carbon (S/C) molar ratios less than 1.0. It was found that the catalytic activity and selectivity depended strongly on the nature of the support and the interaction between Ni and CeO 2. The Ni–CeO 2/Al 2O 3 catalysts, which were prepared by impregnating boehmite (AlOOH) with an aqueous solution of cerium and nickel nitrates, exhibited the optimal catalytic activity and remarkable stability for the steam reforming of LPG in the temperature range of 275–375 °C. The effects of CeO 2 loading, reaction temperature and S/C ratio on the catalytic behavior of the Ni–CeO 2/Al 2O 3 catalysts were discussed in detail. The results showed that the catalysts with 10 wt.% CeO 2 had the highest catalytic activity, and higher S/C ratios contributed to LPG reforming and the methanation of carbon oxides and hydrogen. The XRD and H 2-TPR analyses revealed that the strong interaction between Ni and CeO 2 resulted in the formation of CeAlO 3 in the Ni–CeO 2/Al 2O 3 catalysts reduced. The stability tests of 15Ni–10CeO 2/Al 2O 3 catalyst at 350 °C indicated that the catalyst was stable, and the stability could be enhanced by increasing S/C ratio.
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