The role of catalyst support on the activity of nickel for reforming methane with CO2

Gadalla, Ahmed M.; Bower, B.

doi:10.1016/0009-2509(88)80058-7

Cited by 421 publications

(197 citation statements)

References 6 publications

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“…Reforming with CO 2 , rather than steam reforming with H 2 O yields syngas with lower H 2 /CO ratios, which is especially attractive for attractive for oxo synthesis (Hydroformylation) of aldehydes from alkenes and possibly also for Fischer-Tropsch synthesis of long-chain hydrocarbons [5,6].…”

Section: Introductionmentioning

confidence: 99%

Redox dynamics of Ni catalysts in CO2 reforming of methane

et al. 2015

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The influence of redox dynamics of a Ni/MgAl oxide catalyst for dry reforming of methane (DRM) at high temperature was studied to correlate structural stability with catalytic activity and coking propensity.Structural aging of the catalyst was simulated by repeated temperature-programmed reduction / oxidation (TPR/TPO) cycles. Despite a very high Ni loading of 55.4 wt.-%, small Ni nanoparticles of 11 nm were obtained from a hydrotalcite-like precursor with a homogeneous distribution. Redox cycling gradually changed the interaction of the active Ni phase with the oxide support resulting in a crystalline Ni/MgAl 2 O 4 -type catalyst. After cycling the average particle size increased from 11 to 21 nm -while still a large fraction of small particles was present -bringing about a decrease in Ni surface area of 72%. Interestingly, the redox dynamics and its strong structural and chemical consequences were found to have only a moderate influence on the activity in DRM at 900 °C, but lead to a stable attenuation of carbon formation due to a lower fraction of graphitic carbon after DRM in a fixed-bed reactor. Supplementary DRM experiments in a thermobalance revealed that coke formation as a continuous process until a carbon limit is reached and confirmed a higher coking rate for the cycled catalyst.

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Section: Introductionmentioning

confidence: 99%

Redox dynamics of Ni catalysts in CO2 reforming of methane

et al. 2015

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“…It is well known that noble metal catalysts meet those requirements [3,4]. However, the high cost of these materials prompted the research on less expensive catalysts like Ni [5][6][7][8][9][10], Co [11][12][13][14] or Fe [15], even though they are prone to carbon generation via CH 4 decomposition (CH 4 ↔ 2H 2 + C, ∆Hº= 75 kJ·mol -1 ) or Boudouard reaction (2CO ↔ C + CO 2 , ∆Hº= -171 kJ·mol -1 ) [16].…”

Section: Introductionmentioning

confidence: 99%

Relationship between carbon morphology and catalyst deactivation in the catalytic decomposition of biogas using Ni, Co and Fe based catalysts

Llobet

Pinilla

Moliner

et al. 2015

Fuel

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A novel approach to the decomposition of biogas consisting in the simultaneous production of syngas (H 2 and CO mixture) and bio-nanostructured filamentous carbon (BNFC) is proposed. Catalysts with different active phases such as Ni, Co or Fe on Al 2 O 3 are studied in the temperature range between 600 and 900 ºC. Their behaviour was analysed considering CH 4 and CO 2 conversions, reaction rates, catalyst stability and carbon production. Additionally, the BNFC produced were characterised by transmission electron microscopy. Depending on the active phase and the reaction temperature, different carbon types were identified: fishbone, parallel and chain-like BNFC and encapsulating carbon. Large amounts of BNFC and good catalyst stability were achieved with the Ni/Al 2 O 3 catalyst at 600 ºC, pointing out that carbon accumulation is not directly responsible of catalyst deactivation and that the key factor is the nature of carbon formed during the reaction.

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“…Conversion of methane into synthesis gas is important because the synthesis gas can be converted into higher hydrocarbons and other chemicals 1) . The production of synthesis gas from methane is widely based on steam reforming 2), 3) and partial oxidation 4), 5) .…”

Section: Introductionmentioning

confidence: 99%

CO<sub>2</sub> Reforming of Methane on Ni- and Co-based Intermetallic Compound Catalysts

Komatsu

Uezono

2005

J. Jpn. Petrol. Inst.

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Catalytic properties of Ni-and Co-based intermetallic compound (IMC) were assessed for the CO2 reforming of methane. Single-phase IMCs were prepared by arc-melting mixtures of stoichiometric amounts of nickel or cobalt and a second element. IMCs were crushed into particles and used as a catalyst for the CO2 reforming of methane at 1073 K. Ni-and Co-IMCs containing Ta, Hf and Sc showed higher initial activity than Ni and Co powders. Stability of these IMCs was examined for the reaction at 923 K because lower temperatures favor coke formation. Among Ni-IMCs, Ni7Hf2, NiHf and NiHf2 showed high stability for CO2 conversion. However, temperature programmed oxidation revealed that a relatively large amount of coke was formed on these catalysts. Filamentous carbon was observed by TEM on NiHf. High activity for the hydrogenation of ethene suggested that the surface of Ni _ Hf IMCs is separated into Ni particles and Hf species. Among Co-IMCs, Co2Sc and CoHf2 showed stable CO2 conversion at 923 K. Low ethene hydrogenation activity suggested that the surface of these Co-IMCs consists of each IMC phase. CoHf2 formed less coke than Co2Sc. Only a slight decrease in CO2 conversion was observed on CoHf2 after 100 h of the reforming reaction at 923 K. CoHf2 is a good catalyst for the CO2 reforming of methane with high stability for reforming activity and low activity for coke formation.

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The role of catalyst support on the activity of nickel for reforming methane with CO2

Cited by 421 publications

References 6 publications

Redox dynamics of Ni catalysts in CO2 reforming of methane

Redox dynamics of Ni catalysts in CO2 reforming of methane

Relationship between carbon morphology and catalyst deactivation in the catalytic decomposition of biogas using Ni, Co and Fe based catalysts

CO<sub>2</sub> Reforming of Methane on Ni- and Co-based Intermetallic Compound Catalysts

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