Catalytic Nonoxidation Dehydrogenation of Ethane Over Fe-Ni Catalysts Supported on Mg (Al)O to Produce Hydrogen and Easily Purified Carbon Nanotubes
Nonoxidative decomposition of ethane was conducted over monometallic Ni and bimetallic Fe-Ni catalysts on basic Mg(Al)O support to produce H2 free of CO and CO2 and easily purified carbon nanotubes, a potentially valuable byproduct. The Mg(Al)O support was prepared by calcination of synthetic MgAl-hydrotalcite with a Mg to Al ratio of 5. The catalysts were prepared by incipient wetness with total metal loadings of 5 wt %. The dehydrogenation of undiluted ethane was conducted at temperatures of 500, 650, and 700 C. At 500 C, the Ni/Mg(Al)O catalyst was highly active and very stable with 100% conversion of ethane to 20 vol % H2 and 80 vol % CH4. However, the bimetallic Fe-Ni/Mg(Al)O exhibited its best performance at 650 C, yielding 65 vol % H2, 10 vol % CH4, and 25 vol % unreacted ethane. The product carbon was in the form of carbon nanotubes (CNT) at all three reaction temperatures, but the morphology of the CNT depended on both the catalyst composition and reaction temperature. The CNTs were formed by a tip-growth mechanism over the Mg(Al)O supported catalysts and were easily purified by a one-step dilute nitric acid treatment. Mossbauer spectroscopy, X-ray absorption fine structure spectroscopy, N2 adsorption-desorption isotherms, TEM, STEM, TGA, and XRD were used to characterize the catalysts and the CNT, revealing the catalytic mechanisms.
- Research Organization:
- Brookhaven National Laboratory (BNL) National Synchrotron Light Source
- Sponsoring Organization:
- Doe - Office Of Science
- DOE Contract Number:
- AC02-98CH10886
- OSTI ID:
- 960049
- Report Number(s):
- BNL--83035-2009-JA
- Journal Information:
- Energy and Fuels, Journal Name: Energy and Fuels Journal Issue: 6 Vol. 21; ISSN ENFUEM; ISSN 0887-0624
- Country of Publication:
- United States
- Language:
- English
Similar Records
Novel Fe-Ni Nanoparticle Catalyst for the Production of CO- and CO2-free H2
Lamellar Fe/Al{sub 2}O{sub 3} catalyst for high-yield production of multi-walled carbon nanotubes bundles
Grafted nickel-promoter catalysts for dry reforming of methane identified through high-throughput experimentation
Journal Article
·
Mon Dec 31 23:00:00 EST 2007
· Applied Catalysis. A, General
·
OSTI ID:980369
Lamellar Fe/Al{sub 2}O{sub 3} catalyst for high-yield production of multi-walled carbon nanotubes bundles
Journal Article
·
Tue Feb 03 23:00:00 EST 2009
· Materials Research Bulletin
·
OSTI ID:21199683
Grafted nickel-promoter catalysts for dry reforming of methane identified through high-throughput experimentation
Journal Article
·
Wed Sep 29 00:00:00 EDT 2021
· Applied Catalysis. A, General
·
OSTI ID:1837073