Role of lattice oxygen in the partial oxidation of methane over Rh/zirconia-doped ceria. Isotopic studies

Journal Article · Mon Mar 01 04:00:00 EST 2010 · International Journal of Hydrogen Energy

DOI:https://doi.org/10.1016/j.ijhydene.2009.12.023· OSTI ID:1012905

MD, Salazar-Villalpando; DA, Berry; A, Cugini

Isotopic tracer and nuclear reaction analysis (NRA) are used to probe the identity of oxygen for CO formation during the catalytic partial oxidation (CPOX) of methane to synthesis gas on 18O2 labeled Rh (1 wt.%)/(Ce0.56Zr0.44)O2 x. Results reveal that methane is selectively oxidized by lattice oxygen ions from the catalyst to form carbon monoxide. 18O2 isotopic exchange experiments, as a function of temperature in the 0–850 C range, were performed on Rh (1 wt.%)/(Ce0.56Zr0.44)O2 x, and (Ce0.56Zr0.44)O2 x. It was observed that the presence of rhodium considerably accelerates the oxygen exchange with the support; the maximal exchange rates could be observed at lower temperatures, 250 C. This may be due to oxygen spillover from the metal particles to the oxide. Comparing results from the isotopic exchange experiments on Rh/g-alumina and Rh (1 wt.%)/(Ce0.56Zr0.44)O2 x. It was revealed that oxygen conducting materials have a much higher oxygen storage capacity and isotopic exchange rate than non-oxygen conducting materials.

• Research Organization: National Energy Technology Laboratory - In-house Research; National Energy Technology Laboratory (NETL), Pittsburgh, PA, and Morgantown, WV (United States)
• Sponsoring Organization: US Energy Research and Development Administration (ERDA); USDOE Assistant Secretary for Fossil Energy (FE)
• OSTI ID: 1012905
• Report Number(s): netltpr-2733
• Journal Information: International Journal of Hydrogen Energy, Journal Name: International Journal of Hydrogen Energy Journal Issue: 5 Vol. 35; ISSN 0360-3199
• Country of Publication: United States
• Language: English

Related Subjects

Partial oxidation of methane Oxygen isotopic exchange Doped ceria Lattice oxygen Rhodium