Abstract
A series of nickel-platinum catalysts supported on gamma alumina (γ-Al2O3) with small, increasing amounts of Pt promoter were precisely prepared by electroless deposition at 5.0 wt% Ni and with compositions up to 2.8 wt% Pt (one theoretical monolayer of Pt on Ni) and evaluated for the dry reforming of methane. Characterization was performed using x-ray diffraction, temperature programmed reduction, scanning transmission electron microscopy, and temperature programmed oxidation. At temperatures below 600 °C, activity of bimetallic samples exhibited a maximum at 0.4 monolayers Pt and surpassed that of unpromoted Ni. At 700 °C, deactivation occurred for all samples. X-ray diffraction patterns of the high-temperature treated catalysts indicated segregation of the Ni-Pt alloys. Pt showed no influence on hydrogen selectivity, which was driven by thermodynamic limits.
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