Novel Fe-Ni Nanoparticle Catalyst for the Production of CO- and CO2-free H2
A novel nanoparticle impregnation method was used to prepare an Fe-Ni nanoparticle (np) catalyst supported on Mg(Al)O for the production of CO- and CO2-free H2 and carbon nanotubes (CNT) by non-oxidative dehydrogenation of methane. This novel catalyst and a catalyst of similar composition prepared by incipient wetness (IW) were evaluated for their catalytic performance and their structures were determined by several microscopic and spectroscopic techniques. Monosized Fe0.65-Ni0.35 oxide nanoparticles with an average particle size of 9 nm were prepared by thermal decomposition of an Fe-Ni oleate-surfactant complex in octadecene under reflux; these nanoparticles were dispersed onto a Mg(Al)O support to form a supported Fe-Ni np/Mg(Al)O catalyst. Compared with the Fe-Ni IW/Mg(Al)O catalyst, the nanoparticle catalyst was more easily reduced at a lower temperature (600 C in H2) and exhibited enhanced methane dehydrogenation and longer life-times at both 600 and 650 C. Each reduced Fe-Ni nanoparticle functioned as an active site for the growth of CNT. The CNT were in the form of multi-walled nanotubes (MWNT) of relatively uniform diameter. An invar-like Fe-Ni-C alloy phase is believed to be the active phase for methane dehydrogenation. The deactivation of the nanoparticle catalyst is principally due to encapsulation of catalyst particles by the CNT.
- Research Organization:
- Brookhaven National Lab. (BNL), Upton, NY (United States). National Synchrotron Light Source
- Sponsoring Organization:
- Doe - Office Of Science
- DOE Contract Number:
- DE-AC02-98CH10886
- OSTI ID:
- 980369
- Report Number(s):
- BNL-93287-2010-JA; TRN: US201015%%1754
- Journal Information:
- Applied Catalysis. A, General, Vol. 351; ISSN 0926-860X
- Country of Publication:
- United States
- Language:
- English
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