Decomposition of methane with an autocatalytically reduced nickel catalyst

Couttenye, Richard A.; Vila, Marianela Hoz De; Suib, Steven L.

doi:10.1016/j.jcat.2005.05.006

Cited by 51 publications

(23 citation statements)

References 19 publications

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“…Ni/Al 2 O 3 is a well known catalyst of CH 4 thermal decomposition, but so are Ni/NiO catalysts. Couttenye et al (2005) found an increase of activity with increasing size of NiO crystallites. In addition carbons are also active in CH 4 thermal decomposition (Muradov et al, 2005).…”

Section: Results Under Ch 4 /N 2 /Steam(fuel) Feed and Discussionmentioning

confidence: 89%

Production of hydrogen by unmixed steam reforming of methane

Dupont

Ross

Knight

et al. 2008

Chemical Engineering Science

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Unmixed steam reforming is an alternative method of catalytic steam reforming that uses separate air and fuel-steam feeds, producing a reformate high in H 2 content using a single reactor and a variety of fuels. It claims insensitivity to carbon formation and can operate autothermally. The high H 2 content is achieved by in-situ N 2 separation from the air using an oxygen transfer material (OTM), and by CO 2 capture using a solid sorbent. The OTM and CO 2 sorbent are regenerated during the fuel-steam feed and the air feed respectively within the same reactor. This paper describes the steps taken to choose a suitable CO 2 -sorbent material for this process when using methane fuel with the help of micro reactor tests, and the study of the carbonation efficiency and regeneration ability of the materials tested. Elemental balances from bench scale experiments using the best OTM in the absence of the CO 2 sorbent allow identifying the sequence of the chemical reaction mechanism. The effect of reactor temperature between 600 and 800°C on the process outputs is investigated. Temperatures of 600°C and 800°C under the fuel-steam feed were each found to offer a different set of desirable outputs. Two stages during the fuel-steam feed were characterised by a different set of global reactions, an initial stage where the OTM is reduced directly by methane, and indirectly by hydrogen produced by methane thermal decomposition, in the second stage, steam reforming takes over once sufficient OTM has been reduced. The implications of these stages on the process desirable outputs such as efficiency of reactants conversion, reformate gas quality, and transient effects are discussed.

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Section: Results Under Ch 4 /N 2 /Steam(fuel) Feed and Discussionmentioning

confidence: 89%

Production of hydrogen by unmixed steam reforming of methane

Dupont

Ross

Knight

et al. 2008

Chemical Engineering Science

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“…The stability and activity of Ni catalysts for CDM reaction depend on its textural properties and surface structure. A review of the results reported in literature shows that the morphological appearance of the deposited carbon and the kinetics of CDM are affected by the nature of the active sites of the catalyst [9], the structure of the catalytic system, the textural properties and the size of the catalyst particles [10], the nature of the support [11,12], and the operating conditions, including the concentration of methane in the feed [13] and the reactor flow rate [14]. CDM reaction needs Ni-catalysts in which Ni crystallites have been stabilized, in order to avoid sintering during the regeneration process.…”

Section: Introductionmentioning

confidence: 99%

H2 production from CH4 decomposition: Regeneration capability and performance of nickel and rhodium oxide catalysts

Rivas¹,

Hori²,

Fierro³

et al. 2008

Journal of Power Sources

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“…This is in contrast to recent fixed bed reactor studies by Suib and co-workers, wherein a significantly higher initial methane conversion for the reduced Ni catalyst (40% Ni/SiO 2 catalyst prepared from nitrate salts) was observed as compared to the unreduced version. 18 However, these studies do suggest that unreduced catalysts depending on the synthesis procedure may provide large CF yields. Since the pre-reduction treatment is an important process parameter for CF formation, it would be worthwhile to obtain a detailed understanding apropos the effect of catalyst reduction on methane conversions/CF yields.…”

Section: Production Of Carbon Filaments By Catalytic Methane Decomposmentioning

confidence: 97%

“…Recent studies have shown that unreduced Ni catalysts, 18 depending on the synthesis procedure, are also efficient for the hydrogen production reaction. Since most fundamental studies have been undertaken on reduced Ni catalysts (Ni 0 ), it will be interesting to investigate methane decomposition fundamentals on unreduced Ni catalysts.…”

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confidence: 99%