Characterization of Fe-catalyzed carbon nanotubes grown by thermal chemical vapor deposition

Park, Jong-Bong; Choi, Gyu Seok; Cho, Yu-Seok; Hong, Sang-Young; Kim, Dojin; Choi, Sukyung; Lee, Jinho; Cho, Kyoung-Ik

doi:10.1016/s0022-0248(02)01661-5

Cited by 59 publications

(24 citation statements)

References 15 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…The most promising method for the large-scale production of CNTs is the catalytic chemical vapor deposition (CCVD) [3][4][5][6]. The most popular catalysts utilized in the formation of CNTs via CCVD are Fe, Co, Mo, and Ni supported on MgO, SiO 2 , Al 2 O 3 , CaO, and ZrO 2 [7][8][9][10]. Nickel catalysts have been found to be very active and stable, being able to work in a wide range of temperatures [11,12].…”

Section: Introductionmentioning

confidence: 99%

CNT and H2 Production during CH4 Decomposition over Ni/CeZrO2. II. Catalyst Performance and Its Regeneration in a Fluidized Bed

Łamacz

Łabojko

2019

ChemEngineering

View full text Add to dashboard Cite

In this work, a ceria-zirconia supported nickel catalyst (Ni/CeZrO2) was for the first time used in a fluidized bed reactor in order to obtain carbon nanotubes (CNTs) and H2 in the reaction of the decomposition of CH4. The same catalyst was afterward regenerated with H2O, which was accompanied with the production of H2. The impact of catalyst granulation, temperature, and gas hourly space velocity (GHSV) on the amount and type of carbon deposits was determined using thermogravimetric analysis (TGA) and scanning and transmission electron microscopy (SEM and TEM). The presence of randomly oriented and curved CNTs with an outer diameter of up to 64 nm was proved. The Ni/CeZrO2 particles were loosely covered with CNTs, freely dispersed over CNTs, and strongly attached to the external CNT walls. TEM proved the presence of a Ni/CeZrO2@CNT hybrid material that can be further used as catalyst, e.g., in WGS or DRM reactions. The impact of GHSV on hydrogen production during catalyst regeneration was determined. The catalyst was subjected to cyclic tests of CH4 decomposition and regeneration. According to the obtained results, Ni/CeZrO2 can be used in CH4 conversion to CNTs and H2 (instead of CH4 combustion), e.g., in the vicinity of installations that require methane utilization.

show abstract

Section: Introductionmentioning

confidence: 99%

CNT and H2 Production during CH4 Decomposition over Ni/CeZrO2. II. Catalyst Performance and Its Regeneration in a Fluidized Bed

Łamacz

Łabojko

2019

ChemEngineering

View full text Add to dashboard Cite

show abstract

“…Three main generic synthesis methods have been used to make CNTs and these are: arc-discharge [5,7], laser ablation [8] and chemical vapor deposition (CVD) [9]. All three methods can produce SWCNTs and MWCNTs.…”

Section: Introductionmentioning

confidence: 99%

Synthesis of multi-walled carbon nanotubes catalyzed by substituted ferrocenes

Mohlala

Liu

Coville

2006

Journal of Organometallic Chemistry

View full text Add to dashboard Cite

“…Our calculations for the flux expulsion were performed for nanotubes of more optimistic sizes, that is, about 200 nm in diameter. Such tubes can be grown [10], but they are so far very dirty and contain topological defects. However, they already exist and the growth techniques can no doubt be refined to rid them of impurities.…”

Section: Persistent Currents and Collective Phenomena In Multiwall Camentioning

confidence: 99%

Collective Phenomena in Multiwall Carbon Nanotubes

2004

View full text Add to dashboard Cite

Collective phenomena due to persistent currents in carbon multiwall nanotubes are studied. The formula for persistent currents minimising free energy and conditions for the stability of persistent currents in multiwall nanotubes in magnetic field are derived. Numerical calculations performed show the possibility of obtaining spontaneous currents in two optimal configurations: undoped armchair-only multiwall nanotubes up to 0.01 K, and zig-zag-chiral−chiral-zig-zag multiwall nanotubes doped to -3.033 eV up to about 1 K. The latter configuration may exhibit also the diamagnetic expulsion of magnetic field, which according to our calculations can reach 20% of the external flux.

show abstract

Characterization of Fe-catalyzed carbon nanotubes grown by thermal chemical vapor deposition

Cited by 59 publications

References 15 publications

CNT and H2 Production during CH4 Decomposition over Ni/CeZrO2. II. Catalyst Performance and Its Regeneration in a Fluidized Bed

CNT and H2 Production during CH4 Decomposition over Ni/CeZrO2. II. Catalyst Performance and Its Regeneration in a Fluidized Bed

Synthesis of multi-walled carbon nanotubes catalyzed by substituted ferrocenes

Collective Phenomena in Multiwall Carbon Nanotubes

Contact Info

Product

Resources

About