Novel Fe-Ni Nanoparticle Catalyst for the Production of CO- and CO2-free H2

Journal Article · Tue Jan 01 04:00:00 EST 2008 · Applied Catalysis. A, General

DOI:https://doi.org/10.1016/j.apcata.2008.09.004· OSTI ID:980369

Shen, W; Huggins, F; Shah, N; Jacobs, G; Wang, Y; Shi, X; Huffman, G

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 Laboratory (BNL) National Synchrotron Light Source
• Sponsoring Organization: Doe - Office Of Science
• DOE Contract Number: AC02-98CH10886
• OSTI ID: 980369
• Report Number(s): BNL--93287-2010-JA
• Journal Information: Applied Catalysis. A, General, Journal Name: Applied Catalysis. A, General Vol. 351; ISSN 0926-860X
• Country of Publication: United States
• Language: English

Related Subjects

03 NATURAL GAS
ALLOYS
CARBON
CATALYSTS
DEACTIVATION
DEHYDROGENATION
ENCAPSULATION
GROWTH
IMPREGNATION
METHANE
NANOTUBES
OXIDES
PARTICLE SIZE
PARTICLES
PERFORMANCE
PRODUCTION
PYROLYSIS
SUPPORTS
national synchrotron light source