Tar reforming in model Gasifier effluents: Transition metal/rare earth oxide catalysts

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The removal of tars from syngas generated in biomass or coal/biomass gasifiers plays an important role in syngas cleanup. Rare earth oxides (REOs, e.g., Ce/LaOx) mixed with transition metals (e.g., Mn, Fe) were synthesized by various methods and in some cases supported on a thermally stable alumina. These catalysts were applied to tar removal in the temperature range <1100 K using synthetic syngas mixtures with C H as a tar model compound, both with and without H S. Some commercial Ni reforming catalyst formulations were examined comparatively. Fresh and used catalysts were characterized by XANES, XAFS, XRD, TPO, and BET. We found that the C H is reformed to at least methane, although further reforming to CO and H is not always achieved. While CO , H S, and coke formation all inhibited or deactivated the catalysts at certain temperatures and to different extents, it was determined that Fe- or Mn-doped supported REOs are promising tar cleanup catalysts. They exhibited higher sulfur tolerance, less coking, and less methanation than typical Ni-based high temperature reforming catalysts. This behavior is in part attributed to enhanced generation of oxygen vacancies in the doped REOs. © 2014 American Chemical Society. 10 8 2 10 8 2 2 2

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Industrial and Engineering Chemistry Research

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