Evaluation of activated carbons based on olive stones as catalysts during hydrogen production by thermocatalytic decomposition of methane

Mahmoudi, Marwa; Dentzer, Joseph; Gadiou, Roger; Ouederni, Abdelmottaleb

doi:10.1016/j.ijhydene.2016.11.177

Cited by 28 publications

(13 citation statements)

References 27 publications

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“…Then, from the comparison with published data, the apparent activation energy measured in this study are significantly higher than the one generally observed for nickel on oxide catalysts. They are more close to the values obtained for non-doped carbon materials [36]. This shows that, for short reaction times, the direct methane decomposition on carbon accounts for a significant part of the methane decomposition reaction.…”

Section: Activation Energysupporting

confidence: 86%

“…CAGOP-Ni 2 then exhibits a higher stability factor than CAGOC-Ni 2 as seen in Table 1. This difference between physically and chemically ACs was also observed for the corresponding carbon materials without the presence of nickel [36]. This shows the major contribution of the carbon support to the global reaction rate in this range.…”

Section: Influence Of Temperaturesupporting

confidence: 59%

“…and the contribution of the physicochemical properties of catalysts (texture, structure, surface chemistry), that allowed obtaining kinetic expressions that describe the mechanism of this process [28,[30][31][32][33][34][35]. AC exhibits a higher efficiency compared to carbon black because of their high surface area and surface reactivity, but they undergo a more rapid deactivation [30,36].…”

Section: Introductionmentioning

confidence: 99%

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Hydrogen production by methane decomposition over Ni-doped activated carbons: effect of the activation method

Mahmoudi¹,

Dufour²,

Bettahar³

et al. 2022

Comptes Rendus. Chimie

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Ni supported over activated carbon (AC) based on olive stones were tested for methane decomposition to produce hydrogen. Physical (by H 2 O) and chemical (by H 3 PO 4 ) activations were compared. Kinetic parameters of methane decomposition were determined depending on Ni load, methane partial pressure and reaction temperature. The catalysts were characterized before and after reaction by N 2 adsorption, X-ray Diffraction (XRD) and Transmission Electron Microscopy (TEM). The catalysts showed good initial activities that increased with temperature and nickel load, reactivity decreased with time. The reaction orders were 0.63 and 0.74 and the activation energies were 122 and 139 kJ/mol for physically and chemically activated carbon, respectively. BET surface areas and pore volumes decreased dramatically after reaction due to the deposit of carbon on the support. Ni stayed under its metallic form on the physically AC whereas it was mainly present as Ni 12 P 5 over the chemically activated one. TEM characterization revealed the formation of well-organized carbon nano-onions surrounding Ni particles on the physically activated carbon. Nano-onions were not formed around Ni 12 P 5 particles in the chemically activated carbon. The physical activation allowed the synthesis of catalysts with a better stability for methane conversion than what chemical activation would allow.

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Section: Activation Energysupporting

confidence: 86%

Section: Influence Of Temperaturesupporting

confidence: 59%

Section: Introductionmentioning

confidence: 99%

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Hydrogen production by methane decomposition over Ni-doped activated carbons: effect of the activation method

Mahmoudi¹,

Dufour²,

Bettahar³

et al. 2022

Comptes Rendus. Chimie

Self Cite

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“…The catalysts showed a high initial activity followed by a rapid drop wherein textural analyses showed that methane decomposition occurred mainly in micropores. Meanwhile, XRD and Raman characterization showed that activated carbons tend to be more organized after reaction [55]. Wang et al studied coal derived activated carbons with varied mesoporous surface areas ranging from 480 m 2 /g to 1119 m 2 /g-correlating with increased activity [56].…”

Section: Continued Studies Using Porous or Activated Carbonsmentioning

confidence: 99%

Carbons as Catalysts in Thermo-Catalytic Hydrocarbon Decomposition: A Review

Wal

Nkiawete

2020

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Thermo-catalytic decomposition is well-suited for the generation of hydrogen from natural gas. In a decarbonization process for fossil fuel—pre-combustion—solid carbon is produced, with potential commercial uses including energy storage. Metal catalysts have the disadvantages of coking and deactivation, whereas carbon materials as catalysts offer resistance to deactivation and poisoning. Many forms of carbon have been tested with varied characterization techniques providing insights into the catalyzed carbon deposition. The breadth of studies testing carbon materials motivated this review. Thermocatalytic decomposition (TCD) rates and active duration vary widely across carbons tested. Regeneration remains rarely investigated but does appear necessary in a cyclic TCD–partial oxidation sequence. Presently, studies making fundamental connections between active sites and deposit nanostructures are few.

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“…Lot of articles has been published recently on this topic [6][7][8][9][10]. Among various hydrogen production techniques direct thermo-catalytic decomposition of methane to produce pure hydrogen gas has shown most promising results [11][12][13]. In this process methane is decomposed directly to pure hydrogen and carbon, later being in the form of carbon nanofibers or nanotubes on the surface of catalyst [14].…”

Section: Introductionmentioning

confidence: 99%

Effects of catalytic bed position on hydrogen production by methane decomposition

Sikander¹,

Sufian²,

KuShaari³

et al. 2018

J. MECH. ENG. SCI.

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CO x free hydrogen can be produced by thermal decomposition of methane. Such process is carried out in a fixed bed catalytic reactor. Where heterogeneous catalytic reaction occur when methane come in contact with catalyst bed at a temperature range of 650-900ºC. In this work effect of different catalyst bed positions are investigated on the overall methane conversion to hydrogen. Experimental studies are carried out to in a Fixed Bed Reactor at 700 o C, by placing a catalyst bed of same porosity µ=0.2 at 25%, 50%, 75% column height, and at top of reactor. It is found that same catalyst has shown different results when placed at different heights in reactor column. Highest methane conversion of 85% is found when catalyst bed is placed at 25% column height from bottom. It is found that for endothermic reactions like methane decomposition catalyst bed position has its significance due to its effects on process thermal conditions and on bed expansion by carbon deposition.

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Evaluation of activated carbons based on olive stones as catalysts during hydrogen production by thermocatalytic decomposition of methane

Cited by 28 publications

References 27 publications

Hydrogen production by methane decomposition over Ni-doped activated carbons: effect of the activation method

Hydrogen production by methane decomposition over Ni-doped activated carbons: effect of the activation method

Carbons as Catalysts in Thermo-Catalytic Hydrocarbon Decomposition: A Review

Effects of catalytic bed position on hydrogen production by methane decomposition

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