Recent developments in methane decomposition over heterogeneous catalysts: an overview

Hasnan, Nur Shamimie Nadzwin; Timmiati, Sharifah Najiha; Lim, Kean Long; Yaakob, Zahira; Kamaruddin, Nur Hidayatul Nazirah; Teh, Lee Peng

doi:10.1007/s40243-020-00167-5

Cited by 68 publications

(38 citation statements)

References 147 publications

(191 reference statements)

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“…However, the catalytic performance itself is lower than that of metallic catalysts [53,82]. Although their activity drops after a few hours, due to modifications in the morphology and to pores blockage, unlike metals, it stabilizes after the initial drop in conversion.…”

Section: Carbonaceous Catalystsmentioning

confidence: 98%

“…Although Ni has shown the best catalytic activity among conventional transition metals [44,46], it quickly deactivates above 600 • C because the solid carbon byproduct encapsulates its active sites [26,41,[53][54][55][56]. Co has also a good performance, but it is even more expensive and more toxic than Ni [57].…”

Section: Solid Metallic Catalystsmentioning

confidence: 99%

“…This leads to higher methane conversions [24,34]. However, if they are not of the same type (e.g., activated carbon against graphite), the dislocations and defects are the main factors affecting the catalytic performance, and it is commonly accepted that the defects are the active sites responsible for raising the catalyst activity [34,53]. In this case, the performance of catalysts of different types cannot be directly correlated to their specific surface area.…”

Section: Carbonaceous Catalystsmentioning

confidence: 99%

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Methane Cracking for Hydrogen Production: A Review of Catalytic and Molten Media Pyrolysis

2021

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Currently, hydrogen is mainly generated by steam methane reforming, with significant CO2 emissions, thus exacerbating the greenhouse effect. This environmental concern promotes methane cracking, which represents one of the most promising alternatives for hydrogen production with theoretical zero CO/CO2 emissions. Methane cracking has been intensively investigated using metallic and carbonaceous catalysts. Recently, research has focused on methane pyrolysis in molten metals/salts to prevent both reactor coking and rapid catalyst deactivation frequently encountered in conventional pyrolysis. Another expected advantage is the heat transfer improvement due to the high heat capacity of molten media. Apart from the reaction itself that produces hydrogen and solid carbon, the energy source used in this endothermic process can also contribute to reducing environmental impacts. While most researchers used nonrenewable sources based on fossil fuel combustion or electrical heating, concentrated solar energy has not been thoroughly investigated, to date, for pyrolysis in molten media. However, it could be a promising innovative pathway to further improve hydrogen production sustainability from methane cracking. After recalling the basics of conventional catalytic methane cracking and the developed solar cracking reactors, this review delves into the most significant results of the state-of-the-art methane pyrolysis in melts (molten metals and salts) to show the advantages and the perspectives of this new path, as well as the carbon products’ characteristics and the main factors governing methane conversion.

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Section: Carbonaceous Catalystsmentioning

confidence: 98%

Section: Solid Metallic Catalystsmentioning

confidence: 99%

Section: Carbonaceous Catalystsmentioning

confidence: 99%

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Methane Cracking for Hydrogen Production: A Review of Catalytic and Molten Media Pyrolysis

2021

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“…Physical interaction between the substrate and the catalyst's material reduces the sintering which results in counteraction of the size of catalyst particle during the synthesis. Hence it is important to obtain catalysts with high metallic diffusion showing high particle solidity against the controlled growth of CNTs [32,33].…”

Section: Resultsmentioning

confidence: 99%

Manufacturing and Processing of Carbon Nanotubes for H2 Storage

Namitha

Radhika

Kannan

et al. 2021

Phys. Chem. Solid St.

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In pursuit of manufacturing of carbon nanotubes (CNTs) in good yield at lower temperatures, a mixture of d-block elements such as Iron, Nickel, and Cobalt was expected to be advantageous because of the high yield and low temperature (at 220 - 250° C) synthesis. The physical state and aggregation of these catalyst particles in the reaction medium have been found to play an interesting role in obtaining CNTs at better yield. Carbon nanotubes have been successfully produced by an uncomplicated two-step solvothermal method between sodium and dichlorobenzene via Ni/Fe/Co as catalyst precursor. The dependence of yield of CNTs on the catalyst system was determined via different ratios of catalysts and at various other experimental conditions such as different heating temperatures, different durations of heating. The X-ray powder diffraction study has indicated the graphite kind of the products. Microscopic characterizations (SEM and TEM) implied us the diameters of carbon nanotubes are 10-14 nm. Raman spectroscopy shows the presence of graphitized carbon in carbon nanotubes. Significant influence by the heating temperature and heating duration has been observed on the product yield.

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“…According to Scopus, more than 2000 articles have been devoted to CMD in the last five years ( Figure 1 ). Some reviews were published recently focused on Ni-based catalysts as a function of support, loading amount, composition, and preparation method [ 22 , 23 , 24 ]. Likewise, another review focused on metal-based (e.g., Ni, Fe, noble metal) catalysts with a special focus on the type of reactors used for CO x -free hydrogen production [ 25 ].…”

Section: Introductionmentioning

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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Recent developments in methane decomposition over heterogeneous catalysts: an overview

Cited by 68 publications

References 147 publications

Methane Cracking for Hydrogen Production: A Review of Catalytic and Molten Media Pyrolysis

Methane Cracking for Hydrogen Production: A Review of Catalytic and Molten Media Pyrolysis

Manufacturing and Processing of Carbon Nanotubes for H2 Storage

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

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