Cobalt doping of α-Fe/Al2O3 catalysts for the production of hydrogen and high-quality carbon nanotubes by thermal decomposition of methane

Torres, Daniel; Pinilla, J.L.; Suelves, I.

doi:10.1016/j.ijhydene.2020.05.104

Cited by 34 publications

(19 citation statements)

References 63 publications

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“…In Figure 3, the pink circle indicates carbon morphology, which, in this case, is graphite for all produced carbons. Raman spectra can also be used to determine purity, crystallinity, and degree of structural disorder, for example, the defects and tube alignment of the CNT [23][24][25][26]. [27].…”

Section: Carbon Morphologiesmentioning

confidence: 99%

“…Fe catalysts are cheaper and more environmentally friendly compared to Ni, although they require a somewhat higher temperature range [43]. Torres et al [24] tested Fe catalysts with and without cobalt doping. Results indicated that cobalt-doped catalysts had higher carbon formation and longer activity.…”

Section: Effect Of Catalyst and Promoters On The Carbon Amount And Qu...mentioning

confidence: 99%

“…Demand for carbon products is expected to grow in the future [24]. Currently, the most common production methods are plasma arc discharge, pulsed laser gasification, and catalytic chemical vapor deposition.…”

Section: Possible Applications For Produced Solid Carbonmentioning

confidence: 99%

See 2 more Smart Citations

Carbons Formed in Methane Thermal and Thermocatalytic Decomposition Processes: Properties and Applications

Välimäki

Yli-Varo

Romar³

et al. 2021

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The hydrogen economy will play a key role in future energy systems. Several thermal and catalytic methods for hydrogen production have been presented. In this review, methane thermocatalytic and thermal decomposition into hydrogen gas and solid carbon are considered. These processes, known as the thermal decomposition of methane (TDM) and thermocatalytic decomposition (TCD) of methane, respectively, appear to have the greatest potential for hydrogen production. In particular, the focus is on the different types and properties of carbons formed during the decomposition processes. The applications for carbons are also investigated.

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Section: Carbon Morphologiesmentioning

confidence: 99%

Section: Effect Of Catalyst and Promoters On The Carbon Amount And Qu...mentioning

confidence: 99%

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Carbons Formed in Methane Thermal and Thermocatalytic Decomposition Processes: Properties and Applications

Välimäki

Yli-Varo

Romar³

et al. 2021

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“…In that regard, iron is a promising candidate; Fe is inexpensive and has partially filled 3d orbitals that facilitate the hydrocarbon dissociation. Adding Co to Fe catalysts lead to lower operating temperature and higher catalytic activity relative to the iron monometallic catalyst 32,33 …”

Section: Introductionmentioning

confidence: 99%

Facile modification of cobalt ferrite by SiO ₂ and H‐ZSM‐5 support for hydrogen and filamentous carbon production from methane decomposition

Alharthi

Abdel‐Fattah

Alotaibi

et al. 2022

Intl J of Energy Research

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In this work, new catalyst composed of cobalt ferrite CoFe 2 O 4 supported on amorphous silica (SiO 2 ) and zeolite (H-ZSM-5) were prepared using impregnation method with loading ratio 1:1. The catalytic activity of the new 50 wt% CoFe 2 O 4 /SiO 2 and 50 wt% CoFe 2 O 4 /H-ZSM-5 catalysts were evaluated for direct methane decomposition to hydrogen production at fixed operating temperature of 800 C. The physiochemical properties of the fresh and spent catalysts were characterized by several techniques such as scanning electron microscope (SEM), X-ray diffractometer (XRD), Brunauer-Emmett-Teller, X-ray photoelectron spectroscopy (XPS), thermogravimetric (TGA), and Raman spectroscopy. The CoFe 2 O 4 /H-ZSM-5 catalyst exhibited higher activity and stability than CoFe 2 O 4 /SiO 2 catalyst. Maximum methane conversion reached 37.35% and hydrogen formation rate of 76.48 Â 10 À5 mol H 2 g À1 min À1 at time on stream (TOS) of 300 min for CoFe 2 O 4 /H-ZSM-5, while its 5.80% with 15.82 Â 10 À5 mol H 2 g À1 min À1 at TOS of 30 min. The XRD, Raman, and XPS results confirm the presence of CoFe 2 O 4 particles on the CoFe 2 O 4 /H-ZSM-5 catalyst surface, while the CoFe 2 O 4 particles partially shield with SiO 2 in CoFe 2 O 4 /SiO 2 catalyst. SEM images of spent catalysts elucidated the formation of filamentous carbon which indirectly confirm the higher distribution of CoFe 2 O 4 in CoFe 2 O 4 /H-ZSM-5 than that of CoFe 2 O 4 /SiO 2 . The deposited carbon on spent CoFe 2 O 4 /H-ZSM-5 catalyst was evaluated using TGA, which was found to be ca. 50 wt%. Highlights • CoFe 2 O 4 /SiO 2 and CoFe 2 O 4 /H-ZSM-5 catalysts synthesized and characterized by various techniques. • H-ZSM-5 and SiO 2 support material were found strongly affects the physiochemical properties and the methane decomposition activity of CoFe 2 O 4 catalyst. • CoFe 2 O 4 /H-ZSM-5 catalyst performance reached 37.4% and the hydrogen formation rate was 76.5 Â 10 À5 mol H 2 g À1 min À1 .

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“…Due to the aforementioned advantages in the latter, CDM to hydrogen and nanocarbon attracts the attention of scientists [24]. The most commonly used catalysts in SRM are transition metals, including Ni, Co, and Fe, on supports including Al2O3, SiO2, TiO2, MgO, CeO2, carbon, and zeolites [25][26][27]. Iron-based catalysts are more stable to carbonization, but have low activity in the decomposition of methane [28].…”

Section: Introductionmentioning

confidence: 99%

Catalytic Decomposition of Methane to Hydrogen over Al2O3 Supported Mono- and Bimetallic Catalysts

Ергазиева

Makayeva

Shaimerden

et al. 2021

Bull. Chem. React. Eng. Catal.

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This article discusses the decomposition of methane in the temperature range 550–800 °C on low-percentage monometallic (Ni/g-Al2O3, Co/g-Al2O3) and bimetallic (Ni-Co/g-Al2O3) catalysts. It is shown that the bimetallic catalyst is more active in the decomposition of methane to hydrogen than monometallic ones. At a reaction temperature of 600 °C, the highest methane conversion is 81%, and the highest hydrogen yield of 51% is formed on Ni-Co/g-Al2O3. A complex of physicochemical methods (Scanning Electron Microscope (SEM), X-ray Diffraction (XRD), Temperature Programmed Reduction (TPR-H2), etc.) established that the addition of cobalt oxide to the composition of Ni/g-Al2O3 leads to the formation of surface bimetallic Ni-Co alloys, while the dispersion of particles increases and the reducibility of the catalyst is facilitated, which provides an increase in the concentration of metal particles - active centers, which can be the reason for an increase in the catalytic properties of a bimetallic catalyst in comparison with monometallic ones. Copyright © 2021 by Authors, Published by BCREC Group. This is an open access article under the CC BY-SA License (https://creativecommons.org/licenses/by-sa/4.0).

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Cobalt doping of α-Fe/Al2O3 catalysts for the production of hydrogen and high-quality carbon nanotubes by thermal decomposition of methane

Cited by 34 publications

References 63 publications

Carbons Formed in Methane Thermal and Thermocatalytic Decomposition Processes: Properties and Applications

Carbons Formed in Methane Thermal and Thermocatalytic Decomposition Processes: Properties and Applications

Facile modification of cobalt ferrite by SiO ₂ and H‐ZSM‐5 support for hydrogen and filamentous carbon production from methane decomposition

Catalytic Decomposition of Methane to Hydrogen over Al2O3 Supported Mono- and Bimetallic Catalysts

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Cobalt doping of α-Fe/Al2O3 catalysts for the production of hydrogen and high-quality carbon nanotubes by thermal decomposition of methane

Cited by 34 publications

References 63 publications

Carbons Formed in Methane Thermal and Thermocatalytic Decomposition Processes: Properties and Applications

Carbons Formed in Methane Thermal and Thermocatalytic Decomposition Processes: Properties and Applications

Facile modification of cobalt ferrite by SiO 2 and H‐ZSM‐5 support for hydrogen and filamentous carbon production from methane decomposition

Catalytic Decomposition of Methane to Hydrogen over Al2O3 Supported Mono- and Bimetallic Catalysts

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Facile modification of cobalt ferrite by SiO ₂ and H‐ZSM‐5 support for hydrogen and filamentous carbon production from methane decomposition