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Support Effects for Pt and Rh-Based Catalysts for Partial Oxidation of n-Tetradecane

[+] Author Affiliations
David A. Berry, Dushyant Shekhawat, Todd H. Gardner

U.S. Department of Energy, Morgantown, WV

Maria Salazar

Parsons Project Service, Inc., Morgantown, WV

Daniel J. Haynes, James J. Spivey

Louisiana State University, Baton Rouge, LA

Paper No. FUELCELL2006-97265, pp. 449-452; 4 pages
doi:10.1115/FUELCELL2006-97265
From:
  • ASME 2006 4th International Conference on Fuel Cell Science, Engineering and Technology
  • ASME 2006 Fourth International Conference on Fuel Cell Science, Engineering and Technology, Parts A and B
  • Irvine, California, USA, June 19–21, 2006
  • Conference Sponsors: Nanotechnology Institute
  • ISBN: 0-7918-4247-9 | eISBN: 0-7918-3780-7
  • Copyright © 2006 by ASME

abstract

Catalytic partial oxidation (CPOX) of liquid fuels is an attractive option for producing a hydrogen-rich gas stream for fuel cell applications. However, the high sulfur content along with aromatic compounds present in liquid fuels may deactivate reforming catalysts. Deactivation of these catalysts by carbon deposition and sulfur poisoning is a key technical challenge. The relationship between catalyst supports and deactivation have been studied here for three catalysts (Rh/Ce0.5 Zr0.5 O2 , Pt/Ce0.5 Zr0.5 O2 , and Pt/Al2 O3 ) in a fixed bed catalytic reactor using a mixture of n-tetradecane, 1-methylnaphthalene, and dibenzothiophene to simulate logistic fuels. Carbon production during CPOX reforming was directly related to olefin formation. Olefins, which are known coke precursors, were observed on the Pt catalysts during CPOX of n-tetradecane with no sulfur (particularly from Pt/Al2 O3 ), but not on Rh/Ce0.5 Zr0.5 O2 . For the Rh/Ce0.5 Zr0.5 O2 , yields of H2 and CO dropped to a stationary level after the introduction of sulfur-containing feed (1000 ppm sulfur) or aromatic-containing feed (5 wt%), however, the catalyst activity was restored after removing the sulfur or aromatics from the feed. For the Pt catalysts, H2 and CO yields dropped continuously over time in the presence of sulfur or aromatics in feed. The superior performance of Rh/Ce0.5 Zr0.5 O2 can be attributed to the higher oxygen-ion conductivity of the Ce0.5 Zr0.5 O2 support as well as the activity of the Rh sites.

Copyright © 2006 by ASME
Topics: Catalysts , oxidation

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