Thermocatalytic decomposition of methane over activated carbons: influence of textural properties and surface chemistry

Moliner, R.; Suelves, I.; Lázaro, M.J.; Moreno, O. Portillo

doi:10.1016/j.ijhydene.2004.03.035

Cited by 197 publications

(110 citation statements)

References 12 publications

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“…10; [61]. All the ACs show high initial activity followed by a smooth decrease until the steady state; this is in good agreement with earlier reports [58,60]. Besides their dissimilar surface areas, the initial activities of all the ACs fall in narrow range and this is because a part of the surface of ACs are active for decomposition of methane [54].…”

Section: Cdm Activities Over Carbon Catalystssupporting

confidence: 90%

“…The use of carbon-based catalysts for CO x free hydrogen production via CDM and other hydrocarbons over carbon catalysts have been reported, recently [1,[49][50][51][52][53][54][55][56][57][58][59][60]. The carbon catalysts show several advantages over metal catalysts, such as low cost, easy availability, needless regeneration of the catalyst, valuable carbon by product and it can be catalyzed by the carbon produced in the process, so that external catalyst is not required except for start up.…”

Section: Cdm Activities Over Carbon Catalystsmentioning

confidence: 99%

“…The carbon catalysts show several advantages over metal catalysts, such as low cost, easy availability, needless regeneration of the catalyst, valuable carbon by product and it can be catalyzed by the carbon produced in the process, so that external catalyst is not required except for start up. Muradov [1,[56][57][58] investigated the reaction over several kinds of carbon including activated carbons, carbon blacks, graphite, diamond, glassy carbon, fullerenes, carbon fibers, and carbon nanotubes. Among these, activated carbons and carbon blacks showed reasonable activity and stability at 850°C.…”

Section: Cdm Activities Over Carbon Catalystsmentioning

confidence: 99%

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Development of Methane Decomposition Catalysts for COx Free Hydrogen

2008

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Now-a-days, catalytic decomposition of methane (CDM) into hydrogen and carbon is a promising technique for production of fuel cell grade hydrogen. The Ni based catalysts seems promising particularly for the production of CO x free H 2 by methane decomposition process. The CDM activity and longevity of the Ni based catalysts are mainly influenced by the amount of Ni and type of support material. In this paper the CDM activity results are correlated with NiO crystallite size, Ni metal surface area and acidity of the catalysts. In case of bimetallic catalysts addition of Cu to Ni catalysts lead to enhance the CDM activity at higher temperature thus resulting in the increased concentration of hydrogen in the outlet stream. Finally, some of the carbon-based catalysts are studied for methane decomposition activity at higher temperature. The surface changes over carbon catalysts with methane decomposition are studied using various characterization techniques.

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Section: Cdm Activities Over Carbon Catalystssupporting

confidence: 90%

Section: Cdm Activities Over Carbon Catalystsmentioning

confidence: 99%

Section: Cdm Activities Over Carbon Catalystsmentioning

confidence: 99%

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Development of Methane Decomposition Catalysts for COx Free Hydrogen

2008

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“…The catalytic decomposition of methane (CDM) and other hydrocarbons over activated carbon [5][6][7][8][9] or over metallic catalysts (mainly Ni, Fe and Co) has been proposed in recent years as an interesting alternative route for the production of hydrogen. This process is less energy consuming than steam reforming of methane, and does not directly produce CO and CO 2 [10,12].…”

Section: Introductionmentioning

confidence: 99%

Development of Ni–Al Catalysts for Hydrogen and Carbon Nanofibre Production by Catalytic Decomposition of Methane. Effect of MgO Addition

Latorre¹,

Villacampa²,

Ubieto³

et al. 2008

Top Catal

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Catalytic decomposition of methane is a potential alternative route for the production of hydrogen and nanocarbonaceous materials from natural gas and other hydrocarbon feedstocks. In the present paper, we report the results of characterization and catalytic behaviour during the methane decomposition reaction of a spinel-like NiMg-Al catalyst prepared by coprecipitation. The influence of reaction temperature and feed composition on carbon content, carbon formation rate and carbon morphology has also been studied. The main consequence of MgO addition to the support is the increase in the activity and stability of the Ni-Al catalysts. The better performance of Ni-Mg-Al catalysts is due to the higher interaction generated between Ni particles and the support in this catalyst, which prevents the formation of large metallic particles. The carbonaceous products are carbon nanofibres (diameters *10-35 nm) and amorphous carbon, which causes the catalyst deactivation by encapsulation. The amount of each type of carbonaceous material depends on the different operating conditions used. The reduction-reaction-regeneration cycles lead to a remarkable sintering of the Ni crystallites due to weakening of the metal-support interaction.

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“…Furthermore, conversion of methane as high as 70 % can be achieved over a wood char catalyst 25) . In the above-described systems using a carbon-based catalyst, the methane decomposition activity might be affected by the oxidized surface at the initial stage and by the pore distribution in the steady state stage before poreplugging 26) . However, the initial activity might be affected not by the oxidized surface but by defects in the graphene layers 27) .…”

Section: Direct Conversion Of Methanementioning

confidence: 99%

Methane Conversion Assisted by Plasma or Electric Field

Oshima

Sekine

2013

J. Jpn. Petrol. Inst.

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Direct conversion of methane to other valuable products such as ethylene, methanol, benzene, carbon, hydrogen, and syngas has been widely investigated. Such conversion requires high temperatures because of the strong C-H bond in CH4, and such high-temperature reactions present various problems: sequential reaction to decrease the selectivity to target products, need for multiple heat exchangers to use or recover high-temperature waste heat, materials that are stable at high temperatures, etc. To solve these problems, several trials have been undertaken to lower reaction temperatures using plasma, Non-Faradaic Electrochemical Modification of Catalytic Activity (NEMCA), and electric fields. This review describes recent trends in methane conversion, and describes our methods to lower the reaction temperature.

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Thermocatalytic decomposition of methane over activated carbons: influence of textural properties and surface chemistry

Cited by 197 publications

References 12 publications

Development of Methane Decomposition Catalysts for COx Free Hydrogen

Development of Methane Decomposition Catalysts for COx Free Hydrogen

Development of Ni–Al Catalysts for Hydrogen and Carbon Nanofibre Production by Catalytic Decomposition of Methane. Effect of MgO Addition

Methane Conversion Assisted by Plasma or Electric Field

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