Abstract
Ni/ZrO 2 catalysts promoted with different amounts of CeO 2 (0, 1, 8 and 20 wt.%) were prepared by the sol–gel method. The catalysts were characterized after calcination at 800°C and after reaction of CH 4 reforming with CO 2. Rietveld analysis reveals that the tetragonal ZrO 2 phase (t-ZrO 2) present in the catalysts is stabilized by the CeO 2, forming a solid solution, and avoiding transformation to the monoclinic phase (m-ZrO 2). Ni 2+ also competes with Ce 4+ in the incorporation to t-ZrO 2. The t-ZrO 2 stability increases with CeO 2 concentration. The catalyst activity is increased with the CeO 2 content, although some degree of deactivation, due mainly to the sintering of the support, was not completely avoided by ceria addition. The deposition of graphitic carbon does not play an important role in the catalysts deactivation. The catalytic performance is related to the Ni surface dispersion and NiO reducibility, both promoted by CeO 2 incorporation. CeO 2 enhances the reverse water-gas shift reaction during dry reforming of methane over the studied catalysts.
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