The base versus tip growth mode of carbon nanotubes by catalytic hydrocarbon cracking: Review, challenges and opportunities

Chen, Xinlong; Pang, Xin; Fauteux‐Lefebvre, Clémence

doi:10.1016/j.cartre.2023.100273

Cited by 11 publications

(2 citation statements)

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“…The Fe 2+ satellite peak of Fe2p 1/2 appeared at 723.38 eV. It was demonstrated that the satellite peaks of Fe2p 3/2 and Fe2p 1/2 stem from the combination of iron oxide and nanoparticles of Fe 2 O 3 and FeO [41]. The Fe2p intensity of Pt(1)-Fe(30)/MCM-41 was higher than that of Fe(30)/MCM-41.…”

Section: Characterization Of the Fresh Catalystmentioning

confidence: 96%

“…It was found that noticeable nanometal particles were embedded into the tip of the nanotube, which had a tubular MWCNT structure with a hollow core diameter of 14.1 nm and a wall thickness of 7.8 nm, and 16 layers of graphene. Thus, it can be inferred that the growth of MWCNTs is due to a tip-growth mechanism [41,46], which involves the decomposition of Fe 3 C into Fe and carbon. It is believed that MWCNTs may be formed as supersaturated carbon dissolved in Fe or Pt nanoparticles located on the external surfaces of the MCM-41 carrier.…”

Section: Characterization Of Carbon Deposited On the Catalystmentioning

confidence: 99%

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Catalytic Decomposition of CH4 to Hydrogen and Carbon Nanotubes Using the Pt(1)-Fe(30)/MCM-41 Catalyst

Seo

2024

Catalysts

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The catalytic decomposition of CH4 to H2 and carbon nanotubes (CNTs) was investigated regarding Pt(1)-Fe(30)/MCM-41 and Fe(30)/MCM-41 using a fixed-bed flow reactor under an atmosphere. X-ray diffraction (XRD), X-ray photoelectron spectroscopy (XPS), scanning electron microscopy (SEM), energy dispersive spectroscopy (EDS), transmission electron microscope (TEM), and Raman spectroscopy were used to characterize the behavior of Pt(1)-Fe(30)/MCM-41 and Fe(30)/MCM-41. The hydrogen yield of Pt(1)-Fe(30)/MCM-41 was 3.2 times higher than that of Fe(30)/MCM-41. When 1 wt% of Pt was added to Fe(30)/MCM-41(Mobil Composition of Matter No. 41), the atomic percentage of Fe2p increased from 13.39% to 16.14% and the core Fe2p1/2 electron levels of Fe0 and Fe2+ chemically shifted to lower energies (0.2 eV and 0.1 eV, respectively) than those of Fe(30)/MCM-41. The Fe, Pt, Si, and O nanoparticles were uniformly distributed on the catalyst surface, and the average iron particle sizes of the Pt(1)-Fe(30)/MCM-41 and Fe(30)/MCM-41 were about 33.4 nm and 58.5 nm, respectively. This is attributed to the uniform distribution of the nano-sized iron particles on the MCM-41 surface, which was due to the suitable metal-carrier interaction (SMCI) between Fe, Pt, and MCM-41 and the high reduction degree of Fe due to the spillover effect of H2 from Pt to Fe. Pt(1)-Fe(30)/MCM-41 produced multiwalled CNTs and bamboo-shaped CNTs with high crystallinity and graphitization degree using the tip-growth mechanism, with an ID/IG ratio of 0.93 and a C(101)/C(002) ratio of 0.64.

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Section: Characterization Of the Fresh Catalystmentioning

confidence: 96%

Section: Characterization Of Carbon Deposited On the Catalystmentioning

confidence: 99%