In situ TPR XANES study of the partial oxidation of methane using a Ni-substituted hexaaluminate catalyst
Metallic Ni formation near the mirror cation site, Ba in this study, is believed to cause the partial oxidation activity observed in Ni-substituted hexaaluminate catalysts. The BaNi1.0Al11.6O19-d catalyst was prepared by coprecipitation with nitrate salt precursors; following the coprecipitation procedure, the catalyst was calcined at 1400°C to create the hexaaluminate structure. TPR XANES in fluorescence was used to probe the local structure of the BaNi1.0Al11.6O19-d catalyst to determine whether metallic nickel forms at different temperatures: 825°C, 875°C, 925°C. The XANES results indicate that the Ni in the hexaaluminate catalyst only reduces if the temperature is maintained at 925°C. Once the metallic state is formed, the oxidation state is stable; even in the POX environment. Future work using a theoretical approach to the XANES data using FEFF 8.4 gives information on the interactions between Ni and Ba, which will be used to further optimize the catalyst.
- Research Organization:
- National Energy Technology Laboratory (NETL), Pittsburgh, PA, Morgantown, WV, and Albany, OR; West Virginia University, Morgantown, WV; Louisiana State University, Baton Rouge, LA
- Sponsoring Organization:
- USDOE - Office of Fossil Energy (FE)
- OSTI ID:
- 937459
- Report Number(s):
- DOE/NETL-IR-2008-113; NETL-TPR-1975
- Journal Information:
- Preprints of Papers - American Chemical Society, Division of Fuel Chemistry, Journal Name: Preprints of Papers - American Chemical Society, Division of Fuel Chemistry Journal Issue: 1 Vol. 53; ISSN 0569-3772
- Publisher:
- American Chemical Society (Division of Fuel Chemistry), Washington, DC
- Country of Publication:
- United States
- Language:
- English
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