Abstract
Metal doped yttrium strontium titanate (Y0.08Sr0.88T1-xMxO3, M=Ni, Co, Ru) has been used for the autothermal reforming (ATR) of simulated diesel. A commercial Ni-Al2O3 has been used as a benchmarking catalyst for comparative evaluation. Activity tests using a diesel surrogate fuel containing 50 ppm and later 100 ppm sulfur showed stable performance for all catalysts over 20 hours on reactant stream. Both commercial and Ni-doped yttrium strontium titanate (YSTN) catalysts were further tested for 100 hours using the 50 ppm sulfur containing diesel surrogate. Both catalysts maintained good stability and suffered only little carbon formation. Even though the commercial Ni-Al2O3 catalyst had excellent resistance to carbon formation, the deposited carbon was mainly of graphitic type. The YSTN underwent comparatively higher carbon formation but with the formed carbon predominantly amorphous, thus easily removable upon catalyst regeneration. Unlike the Ni-Al2O3 that suffered extensive coarsening of Ni particles, the perovskite YSTN catalyst showed excellent resistance to sintering during the 100-hour stability tests.
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