Methane decomposition over Ni/carbon catalysts prepared by selective gasification of coal char

Zhang, Jianbo; Xie, Wenting; Li, Xing; Hao, Qingqing; Chen, Huiyong; Ma, Xiaoxun

doi:10.1016/j.enconman.2018.09.075

Cited by 44 publications

(6 citation statements)

References 33 publications

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“…The influence of Ni was not really pronounced in the activity of the Fe-Ni/WO 3 + ZrO 2 catalyst, however, it raised the percentage yield of H 2 to a value above 90% and maintained the stability. Similarly, it was reported by Anis et al that the Ni addition to Fe/Al 2 O 3 enhanced the performance of the catalyst in terms of methane conversion and hydrogen yield [27]. Ni being an active metal with stronger reduction potential than Fe in the electrochemical series would do more in reaction than Fe.…”

Section: Catalystsupporting

confidence: 61%

H2 Production from Catalytic Methane Decomposition Using Fe/x-ZrO2 and Fe-Ni/(x-ZrO2) (x = 0, La2O3, WO3) Catalysts

et al. 2020

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An environmentally-benign way of producing hydrogen is methane decomposition. This study focused on methane decomposition using Fe and Fe-Ni catalysts, which were dispersed over different supports by the wet-impregnation method. We observed the effect of modifying ZrO2 with La2O3 and WO3 in terms of H2 yield and carbon deposits. The modification led to a higher H2 yield in all cases and WO3-modified support gave the highest yield of about 90% and was stable throughout the reaction period. The reaction conditions were at 1 atm, 800 °C, and 4000 mL(hgcat)−1 space velocity. Adding Ni to Fe/x-ZrO2 gave a higher H2 yield and stability for ZrO2 and La2O3 + ZrO2-supported catalysts whose prior performances and stabilities were very poor. Catalyst samples were analyzed by characterization techniques like X-ray diffraction (XRD), nitrogen physisorption, temperature-programmed reduction (TPR), thermo-gravimetric analysis (TGA), and Raman spectroscopy. The phases of iron and the supports were identified using XRD while the BET revealed a significant decrease in the specific surface areas of fresh catalysts relative to supports. A progressive change in Fe’s oxidation state from Fe3+ to Fe0 was observed from the H2-TPR results. The carbon deposits on Fe/ZrO2 and Fe/La2O3 + ZrO2 are mainly amorphous, while Fe/WO3 + ZrO2 and Fe-Ni/x-ZrO2 are characterized by graphitic carbon.

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Section: Catalystsupporting

confidence: 61%

H2 Production from Catalytic Methane Decomposition Using Fe/x-ZrO2 and Fe-Ni/(x-ZrO2) (x = 0, La2O3, WO3) Catalysts

et al. 2020

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“…Although virgin cerium supported on a carbon catalyst has poor activity, its addition to Ni/C catalysts was seen to improve the activity of the whole catalyst. 128 Similarly, the effect of 1−20% Co and 1−20% Fe on Ni/AC catalyst derived from Saimengte coal was studied by Wang et al It was found that bimetallic catalysts Ni−Co/AC and Ni− Fe/AC offered better stability and activity for CH 4 conversion as compared to Ni/AC at 850 °C. 129 Such increased activity of metal-loaded carbon catalysts is attributed to the increased concentration of active sites and the modification of the electronic state.…”

Section: Particle Sizementioning

confidence: 98%

Thermocatalytic Decomposition of Methane: A Review on Carbon-Based Catalysts

Hamdani,

Ahmad,

Chulliyil

et al. 2023

ACS Omega

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The global initiatives on sustainable and green energy resources as well as large methane reserves have encouraged more research to convert methane to hydrogen. Catalytic decomposition of methane (CDM) is one optimistic route to generate clean hydrogen and value-added carbon without the emission of harmful greenhouse gases, typically known as blue hydrogen. This Review begins with an attempt to understand fundamentals of a CDM process in terms of thermodynamics and the prerequisite characteristics of the catalyst materials. In-depth understanding of rate-determining steps of the heterogeneous catalytic reaction taking place over the catalyst surfaces is crucial for the development of novel catalysts and process conditions for a successful CDM process. The design of state-of-the-art catalysts through both computational and experimental optimizations is the need of hour, as it largely governs the economy of the process. Recent mono- and bimetallic supported and unsupported materials used in CDM process have been highlighted and classified based on their performances under specific reaction conditions, with an understanding of their advantages and limitations. Metal oxides and zeolites have shown interesting performance as support materials for Fe- and Ni-based catalysts, especially in the presence of promoters, by developing strong metal–support interactions or by enhancing the carbon diffusion rates. Carbonaceous catalysts exhibit lower conversions without metal active species and largely result in the formation of amorphous carbon. However, the stability of carbon catalysts is better than that of metal oxides at higher temperatures, and the overall performance depends on the operating conditions, catalyst properties, and reactor configurations. Although efforts to summarize the state-of-art have been reported in literature, they lack systematic analysis on the development of stable and commercially appealing CDM technology. In this work, carbon catalysts are seen as promising futuristic pathways for sustained H2 production and high yields of value-added carbon nanomaterials. The influence of the carbon source, particle size, surface area, and active sites on the activity of carbon materials as catalysts and support templates has been demonstrated. Additionally, the catalyst deactivation process has been discussed, and different regeneration techniques have been evaluated. Recent studies on theoretical models towards better performance have been summarized, and future prospects for novel CDM catalyst development have been recommended.

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“…Using various supports, such as carbon [ 67 ], silica [ 68 ], and mixed La 2 O 3 /Al 2 O 3 [ 69 ], with Ni-based catalysts enhanced CMD significantly. The CMD activity of Ni was augmented by doping with Ce, Mg, and Cu in the presence of sucrose as an addition agent [ 70 , 71 ].…”

Section: Metal-based Catalystsmentioning

confidence: 99%

Catalytic Methane Decomposition to Carbon Nanostructures and COx-Free Hydrogen: A Mini-Review

et al. 2021

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Catalytic methane decomposition (CMD) is a highly promising approach for the rational production of relatively COx-free hydrogen and carbon nanostructures, which are both important in multidisciplinary catalytic applications, electronics, fuel cells, etc. Research on CMD has been expanding in recent years with more than 2000 studies in the last five years alone. It is therefore a daunting task to provide a timely update on recent advances in the CMD process, related catalysis, kinetics, and reaction products. This mini-review emphasizes recent studies on the CMD process investigating self-standing/supported metal-based catalysts (e.g., Fe, Ni, Co, and Cu), metal oxide supports (e.g., SiO2, Al2O3, and TiO2), and carbon-based catalysts (e.g., carbon blacks, carbon nanotubes, and activated carbons) alongside their parameters supported with various examples, schematics, and comparison tables. In addition, the review examines the effect of a catalyst’s shape and composition on CMD activity, stability, and products. It also attempts to bridge the gap between research and practical utilization of the CMD process and its future prospects.

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Methane decomposition over Ni/carbon catalysts prepared by selective gasification of coal char

Cited by 44 publications

References 33 publications

H2 Production from Catalytic Methane Decomposition Using Fe/x-ZrO2 and Fe-Ni/(x-ZrO2) (x = 0, La2O3, WO3) Catalysts

H2 Production from Catalytic Methane Decomposition Using Fe/x-ZrO2 and Fe-Ni/(x-ZrO2) (x = 0, La2O3, WO3) Catalysts

Thermocatalytic Decomposition of Methane: A Review on Carbon-Based Catalysts

Catalytic Methane Decomposition to Carbon Nanostructures and COx-Free Hydrogen: A Mini-Review

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