Catalytic partial oxidation of n-tetradecane using Rh and Sr substituted pyrochlores: Effects of sulfur

Journal Article · Wed Jul 15 04:00:00 EDT 2009 · Catalysis Today

DOI:https://doi.org/10.1016/j.cattod.2008.05.014· OSTI ID:937586

Haynes, Daniel J.; Berry, David A.; Shekhawat, Dushyant; Spivey, James J.

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

• Research Organization: National Energy Technology Laboratory (NETL), Pittsburgh, PA, Morgantown, WV, and Albany, OR (United States)
• Sponsoring Organization: USDOE - Office of Fossil Energy (FE)
• OSTI ID: 937586
• Report Number(s): DOE/NETL-IR-2007-257; NETL-TPR-2178
• Journal Information: Catalysis Today, Journal Name: Catalysis Today Journal Issue: 1-2 Vol. 145; ISSN 0920-5861
• Publisher: Elsevier
• Country of Publication: United States
• Language: English

Related Subjects

03 NATURAL GAS
08 HYDROGEN
30 DIRECT ENERGY CONVERSION
33 ADVANCED PROPULSION SYSTEMS
AROMATICS
CARBON
CARBON DIOXIDE
CATALYSTS
DEACTIVATION
DIESEL FUELS
ELECTRONS
FUEL CELLS
GASES
GEOMETRY
HYDROGEN
LANTHANUM
MEMBRANES
METHANE
MIXTURES
NITROGEN
OXIDATION
POROSITY
PYROCHLORE
SULFUR
SURFACE AREA
TRANSPORT
ZIRCONATES