Novel Ni catalysts for methane decomposition to hydrogen and carbon nanofibers

Li, Yong; Zhang, Baocai; Xie, Xiaobing; Liu, Junlong; Xu, Yide; Shen, Wenjie

doi:10.1016/j.jcat.2005.12.027

Cited by 208 publications

(82 citation statements)

References 31 publications

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“…6D). This peak could overlap the peak of Ni crystallites (111) reported by Li et al [12] but we did not detect a clear reduction in the oxidation state of nickel from Ni +2 to Ni 0 (Fig. 2).…”

Section: Texture and Crystalline Phase Characterizationcontrasting

confidence: 43%

“…However, contrary to our preliminary work [11], Chen and co-workers [7] reported that in absence of carbon dioxide or steam an activated carbon-supported nickel-based catalyst was deactivated by Ni 3 C formed during methane decomposition. Li and co-workers [12] found that the catalytic activity of pure Ni catalyst for methane decomposition was related to the crystalline size of reduced Ni. They pointed out that during reaction Ni particles suffered important changes.…”

Section: Introductionmentioning

confidence: 99%

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Changes on Texture and Crystalline Phase of Activated Carbon-Supported Ni-Ca Catalyst During Dry Methane Reforming

Matos¹,

Rosales²,

González³

et al. 2010

TOMSJ

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Changes on texture and crystalline phase of AC-supported Ni-Ca catalyst during dry methane reforming were verified. Characterization by N 2 adsorption, XPS, XRD, TEM and HR-TEM was performed. XPS and XRD analysis suggest that the initial activity can be attributed to a nickel reduced phase formed during helium pre-treatment. TEM showed that a homogeneous distribution of Ni nanoparticles between 10-20nm at the tip of multi-walled carbon nanotubes is formed during reaction. HR-TEM showed diffusion of Ni nanoparticles and the formation of carbon-like nano onions with an interlayer separation of 0.5nm suggesting the formation of a ultra-microporous carbon structure. An increase in surface area from 231m 2 .g -1 to 2405m 2 .g -1 after 90min reaction was found and attributed to an in situ activation of carbon deposits by CO 2 gasification. The present results suggest that introducing CO 2 pulses during reaction carbon-supported Ni-Ca could be employed as potential catalysts for methane and other hydrocarbon reforming reactions at mild experimental conditions.

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Section: Texture and Crystalline Phase Characterizationcontrasting

confidence: 43%

Section: Introductionmentioning

confidence: 99%

Changes on Texture and Crystalline Phase of Activated Carbon-Supported Ni-Ca Catalyst During Dry Methane Reforming

Matos¹,

Rosales²,

González³

et al. 2010

TOMSJ

View full text Add to dashboard Cite

show abstract

“…As we know, carbon deposits play a significant role in the activity and stability of catalysts, and catalyst lifetimes greatly depend on the morphology of the produced carbon [50,51]. As mentioned previously, the main reasons why methane conversion continued to increase in "the third step" and why the pore size distributions of the catalysts were affected remain uncertain.…”

Section: Formation Of Carbon Depositsmentioning

confidence: 99%

“…Metal particles are known to form filamentous carbon with almost the same hollow diameter as elemental carbon by methane decomposition [51,52]. Previous studies have shown that filamentous carbon formed on metal catalysts helps keep the metal exposed and active [29], and active metal at the tip of filamentous carbon is beneficial for dispersing into carbon deposits.…”

Section: Formation Of Carbon Depositsmentioning

confidence: 99%

Preparation of Modified Red Mud-Supported Fe Catalysts for Hydrogen Production by Catalytic Methane Decomposition

Liu

Fang

et al. 2017

Journal of Nanomaterials

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A modified red mud-(MRM-) supported Fe catalyst ( Fe/MRM) was prepared using the homogeneous precipitation method and applied to methane decomposition to produce hydrogen. The TEM and SEM-EDX results suggested that the particle sizes of the Fe/MRM catalysts were much smaller than that of raw red mud (RM), and the active metal Fe was evenly distributed over the catalyst structure. Moreover, BET results indicated that the surface areas and pore volumes of the catalysts were significantly improved, and the pore sizes of Fe/MRM were distributed from 5 to 12 nm, which is typical for a mesoporous material. The activities of those catalysts for the catalytic decomposition of methane were studied at atmospheric pressure at a moderate temperature of 650 ∘ C; the results showed that the Fe/MRM catalysts were more active than RM and MRM. The methane conversion curves of Fe/MRM catalysts exhibited similar variation tendencies (three-step) during the reaction despite different Fe contents, and the loading amount of Fe clearly affected the activity of the catalysts.

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“…For example, a 10 mg catalyst load will result in a final mass of 300-500 mg of carbon during a 1 h reaction. The unmilled, blended catalyst powders also achieved growth, but the activity is attributed to Ni alone, which is known to be a catalytic metal for carbon deposition [7,28,[64][65][66][67][68][69]. The rate is comparable to pure Ni, which was tested as a control sample with growth rates shown in Figure 8.…”

Section: Carbon Depositionmentioning

confidence: 99%

Using Mechanical Alloying to Create Bimetallic Catalysts for Vapor-Phase Carbon Nanofiber Synthesis

Guevara

Wanner

Welsh

et al. 2015

Fibers

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Carbon nanofibers were generated over bimetallic catalysts in an atmospheric pressure chemical vapor deposition (APCVD) reactor. Catalyst compositions of Fe 30 at%, Cu and Ni 30 at% and Cu were mechanically alloyed using high-energy ball milling over durations of 4,8,12,16, and 20 h. The catalyst powders were then used to produce carbon nanofibers in ethylene and hydrogen (4:1) at temperatures of 500, 550, and 600 °C. The microstructures of the catalysts were characterized as a function of milling time as well as at deposition temperature. The corresponding carbon deposition rates were assessed and are correlated to the microstructural features of each catalyst. The milling process directly determines the performance of each catalyst toward carbon deposition, and both catalysts performed comparably to those made by traditional co-precipitation methods. Considerations in miscible and immiscible nanostructured alloy systems are discussed.

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Novel Ni catalysts for methane decomposition to hydrogen and carbon nanofibers

Cited by 208 publications

References 31 publications

Changes on Texture and Crystalline Phase of Activated Carbon-Supported Ni-Ca Catalyst During Dry Methane Reforming

Changes on Texture and Crystalline Phase of Activated Carbon-Supported Ni-Ca Catalyst During Dry Methane Reforming

Preparation of Modified Red Mud-Supported Fe Catalysts for Hydrogen Production by Catalytic Methane Decomposition

Using Mechanical Alloying to Create Bimetallic Catalysts for Vapor-Phase Carbon Nanofiber Synthesis

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