Cart
Article
Cerium Oxide-Based Sorbents for Regenerative Hot Reformate Gas Desulfurization
Full Text HTML
Hi-Res PDFPurchase the full-text
- PDF/HTML,
figures/images,
references and tables,
(where available)
Abstract
The activity and stability of lanthanum- or copper-containing cerium oxide sorbents for hot reformate gas desulfurization were investigated in this work. Reformate gas, derived from the catalytic partial oxidation or autothermal reforming of heavy fuels such as JP-8, is rich in hydrogen and CO and may also contain up to 500 ppmv H2S. Desulfurization at temperatures in the range of 650−800°C is required before using the fuel gas in solid oxide fuel cells. In this work, regenerable cerium oxide-based sorbents were used in desulfurization. The sorbents were prepared with high surface area by the urea coprecipitation/gelation method, followed by slow heating and calcination in air at 650 °C for 4 h. Lanthanum doping (up to 50 at. %) was determined to be effective in moderating the surface area loss of cerium oxide (ceria) in H2S-free reformate gas at 800 °C. On the other hand, severe sintering occurred when copper was used as an additive, even in amounts as low as 10 at. % copper in ceria. However, the copper-containing ceria had the best sulfidation kinetics among the ceria-based sorbents. Sorbents were evaluated in cyclic sulfidation/regeneration tests at 650 and 800 °C, using a simulated reformate gas mixture in sulfidation, and a 3% O2−He gas mixture for regeneration. Using very high space velocities, we determined that sulfidation could be limited to the sorbent surface. The surface sulfur capacity of the sorbents was stable in cyclic sulfidation/regeneration under these conditions.
Citing Articles
Citation data is made available by participants in CrossRef's Cited-by Linking service. For a more comprehensive list of citations to this article, users are encouraged to perform a search in SciFinder.
This article has been cited by 5 ACS Journal articles (5 most recent appear below).
High-Temperature Desulfurization of Gasifier Effluents with Rare Earth and Rare Earth/Transition Metal Oxides
Kerry M. Dooley, Vikram Kalakota, and Sumana AdusumilliEnergy & Fuels2011 25 (3), 1213-1220High-Temperature Desulfurization of Gasifier Effluents with Rare Earth and Rare Earth/Transition Metal Oxides
Kerry M. Dooley, Vikram Kalakota, and Sumana AdusumilliEnergy & Fuels2011 25 (3), 1213-1220We have improved the application of mixed rare-earth oxides (REOs) as hot gas desulfurization adsorbents by impregnating them on stable high surface area supports and by the inclusion of certain transition metal oxides. We report comparative ...
Review of Mid- to High-Temperature Sulfur Sorbents for Desulfurization of Biomass- and Coal-derived Syngas
Singfoong Cheah, Daniel L. Carpenter and Kimberly A. Magrini-BairEnergy & Fuels2009 23 (11), 5291-5307Review of Mid- to High-Temperature Sulfur Sorbents for Desulfurization of Biomass- and Coal-derived Syngas
Singfoong Cheah, Daniel L. Carpenter and Kimberly A. Magrini-BairEnergy & Fuels2009 23 (11), 5291-5307This review examines state-of-the-art mid- and high-temperature sulfur sorbents that remove hydrogen sulfide (H2S) from syngas generated from coal gasification and may be applicable for use with biomass-derived syngas. Biomass feedstocks contain low ...
Characterization of Structural and Surface Properties of Nanocrystalline TiO2−CeO2 Mixed Oxides by XRD, XPS, TPR, and TPD
Shingo Watanabe, Xiaoliang Ma and Chunshan SongThe Journal of Physical Chemistry C2009 113 (32), 14249-14257Characterization of Structural and Surface Properties of Nanocrystalline TiO2−CeO2 Mixed Oxides by XRD, XPS, TPR, and TPD
Shingo Watanabe, Xiaoliang Ma and Chunshan SongThe Journal of Physical Chemistry C2009 113 (32), 14249-14257This work focuses on characterizing the structural and surface properties of TiXCe1-XO2 (TiO2−CeO2) mixed oxides using XRD, XPS, BET, H2-TPR, and NH3-TPD techniques. The TiXCe1-XO2 mixed oxides synthesized by the urea coprecipitation method showed ...
Review of Catalytic Conditioning of Biomass-Derived Syngas
Matthew M. Yung, Whitney S. Jablonski and Kimberly A. Magrini-BairEnergy & Fuels2009 23 (4), 1874-1887Review of Catalytic Conditioning of Biomass-Derived Syngas
Matthew M. Yung, Whitney S. Jablonski and Kimberly A. Magrini-BairEnergy & Fuels2009 23 (4), 1874-1887Thermochemical conversion of biomass to create fuels and chemical products may be achieved through the gasification route via syngas. The resulting biomass-derived raw syngas contains the building blocks of carbon monoxide and hydrogen as well as ...
Phase Segregation in Cerium−Lanthanum Solid Solutions
V. Bellière, G. Joorst, O. Stephan, F. M. F. de Groot, and B. M. WeckhuysenThe Journal of Physical Chemistry B2006 110 (20), 9984-9990Phase Segregation in Cerium−Lanthanum Solid Solutions
V. Bellière, G. Joorst, O. Stephan, F. M. F. de Groot, and B. M. WeckhuysenThe Journal of Physical Chemistry B2006 110 (20), 9984-9990Electron energy-loss spectroscopy (EELS) in combination with scanning transmission electron microscopy (STEM) reveals that the La enrichment at the surface of cerium−lanthanum solid solutions is an averaged effect and that segregation occurs in a mixed ...
Tools
-
Add to Favorites
-
Download Citation
-
Email a Colleague -
Permalink
Order Reprints
Rights & Permissions
Citation Alerts
History
- Published In Issue September 21, 2005
- Received December 30, 2004
Revised Manuscript Received May 11, 2005
ACS
Network
Facebook
Tweet This
CiteULike
Newsvine
Digg This
Delicious
