Catalytic partial oxidation of n-tetradecane on Rh and Sr substituted pyrochlores

FUEL 26

Daniel Haynes, dhayne5@lsu.edu1, David Berry, dberry@netl.doe.gov2, Dushyant Shekhawat, Dushyant.Shekhawat@netl.doe.gov2, Todd H. Gardner, todd.gardner@netl.doe.gov3, and James J. Spivey, jjspivey@lsu.edu1. (1) Dept. of Chemical Engineering, Louisiana State University, S. Stadium Drive, Baton Rouge, LA 70803, (2) National Energy Technology Laboratory, U.S. Department of Energy, P.O. Box 880, Morgantown, WV 26507-0880, (3) Separations & Fuels Processing Division, National Energy Technology Laboratory/U.S. Department of Energy, 3610 Collins Ferry Road P.O. Box 880, Morgantown, WV 26505
Catalyst deactivation by high levels of sulfur and aromatics limits the catalytic partial oxidation (CPOX) of diesel fuel into a H2-rich stream for fuel cells. These species poison traditional supported metal catalysts because they adsorb strongly to electron dense metal clusters and promote the formation of carbon on the surface. In this work, Rh + Sr are substituted into lanthanum zirconate (LZ) pyrochlore (La2Zr2O7) to give an La(2-x)SrxRhyZr(2-y)O(7- î) (LSRZ) catalyst. The resistance to deactivation and carbon formation were examined by the CPOX of a mixture of 5 wt% 1-methylnaphthalene + 1000 ppmw dibenzothiophene in n-tetradecane. The results were compared to a commercial Rh/ã-Al2O3 catalyst. In the presence of these contaminants, the activity of the LSRZ was only kinetically inhibited, which is thought to be attributable to the oxygen-ion conductivity that results from Sr substitution into the pyrochlore structure. Rh/ã-Al2O3 was deactivated, likely due to significant carbon accumulation on/near the Rh metal
 

Fuel Processing for Hydrogen Production: Reforming of Hydrocarbon Fuels
1:25 PM-5:20 PM, Sunday, August 19, 2007 Boston Park Plaza -- Berkeley Rm, Oral

Division of Fuel Chemistry

The 234th ACS National Meeting, Boston, MA, August 19-23, 2007