Title
Tar reforming in model Gasifier effluents: Transition metal/rare earth oxide catalysts
Document Type
Article
Publication Date
5-14-2014
Abstract
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
Publication Source (Journal or Book title)
Industrial and Engineering Chemistry Research
First Page
7999
Last Page
8011
Recommended Citation
Li, R., Roy, A., Bridges, J., & Dooley, K. (2014). Tar reforming in model Gasifier effluents: Transition metal/rare earth oxide catalysts. Industrial and Engineering Chemistry Research, 53 (19), 7999-8011. https://doi.org/10.1021/ie500744h