Coprecipitated Ni-alumina and NiCu-alumina catalysts of methane decomposition and carbon deposition. II. Evolution of the catalysts in reaction

Avdeeva, L.B.; Гончарова, О. В.; Kochubey, D.I.; Зайковский, В. И.; Plyasova, L. M.; Новгородов, Б. Н.; Shaikhutdinov, Sh.K.

doi:10.1016/0926-860x(96)00026-9

Cited by 209 publications

(94 citation statements)

References 10 publications

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“…3e and f). The octopus CNFs are mostly observed from bigger Ni particles, which is in agreement with previous studies [38,[41][42][43][44][45][46][47]. Several effects, such as particle size, surface reconstructions, exposed facets and rate of ethylene decomposition, were proposed to explain the CNF growth preferences [48][49][50][51].…”

Section: Texture and Microstructure Of The Cnf/ac Compositessupporting

confidence: 79%

“…The absence of carbidic phase is expected, as Ni carbide is not stabile at 550 o C [76]. Similarly the presence of metallic state and the absence of carbidic phase of Ni catalyst were previously reported after deactivation from the catalytic carbon support gasification, after graphitization of the amorphous carbon film, and during and after CNT growth [44,63,65,[77][78][79][80][81]. Catalytic gasification, CNT and CNF growth, and catalytic graphitization presumably involve a similar general mechanism of carbon atoms dissolutions, diffusion and precipitation from the catalyst Ni particles [56,65].…”

Section: The Effect Of the Subsequent Treatment To The Cnf/ac Compositementioning

confidence: 83%

“…Catalytic gasification, CNT and CNF growth, and catalytic graphitization presumably involve a similar general mechanism of carbon atoms dissolutions, diffusion and precipitation from the catalyst Ni particles [56,65]. However, several works have claimed the presence of dissolved carbon [44,82] or carbide-like compounds [81] in Ni catalyst particles after CNF growth. Such dissolved carbon or carbon contamination has also been reported in works involving metal catalyst supported on non-graphitic carbons [1,83,84].…”

Section: The Effect Of the Subsequent Treatment To The Cnf/ac Compositementioning

confidence: 99%

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Controlling the yield and structure of carbon nanofibers grown on a nickel/activated carbon catalyst

Rinaldi

Abdullah

Ali

et al. 2009

Carbon

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Carbon nanofibers (CNFs) were grown via the chemical vapor deposition of C2H4 on an activated carbon (AC)-supported Ni catalyst. The texture of the CNF/AC composites can be tuned by varying the growth temperature and by treatment in reducing atmosphere prior to C2H4/H2 exposure. The Ni-catalyzed gasification of the AC support increases the microporosity of the composite and shown to be dominant throughout the composite synthesis especially during reduction, subsequent treatment in reducing atmosphere, and CNF growth at low temperatures. N2 isotherm and scanning electron microscope were used to characterize the texture and morphology of the composites. Subsequent treatment in reducing atmosphere were shown to increase the Ni catalyst activity to grow CNFs. High resolution transmission electron microscope however did not reveal any microstructural difference for Ni catalyst with and without the subsequent reduction treatment. We propose in this paper that the carbon dissolutions during treatment of the catalyst might have an implication on the CNF growth.

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Section: Texture and Microstructure Of The Cnf/ac Compositessupporting

confidence: 79%

Section: The Effect Of the Subsequent Treatment To The Cnf/ac Compositementioning

confidence: 83%

Section: The Effect Of the Subsequent Treatment To The Cnf/ac Compositementioning

confidence: 99%

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Controlling the yield and structure of carbon nanofibers grown on a nickel/activated carbon catalyst

Rinaldi

Abdullah

Ali

et al. 2009

Carbon

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“…57,58 The amount of CF formed per gram of the catalyst was found to increase with increasing Ni content in the Ni-alumina catalyst. However, the CF yield was found to be radically small for pure Ni powder.…”

Section: Production Of Carbon Filaments By Catalytic Methane Decomposmentioning

confidence: 99%

Methane Decomposition: Production of Hydrogen and Carbon Filaments

Spivey¹,

Dooley²

2006

Catalysis

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“…Nickel-based catalysts have been reported as the most appropriate catalysts for tar reduction and hydrogen production due to their availability, catalytic activity and comparatively low cost [5,[13][14][15]. The percentage of nickel in the catalyst used plays an important role in determining the performance of the catalyst [16][17][18], with the amount of hydrogen produced and carbon deposited on the catalyst being affected. Whilst there are various preparation methods for the production of Ni-Al 2 O 3 the impregnation method is one that much shows promise for the production of catalysts [19].…”

Section: Introductionmentioning

confidence: 99%

Thermal processing of plastics from waste electrical and electronic equipment for hydrogen production

Acomb

Nahil

Williams

2013

Journal of Analytical and Applied Pyrolysis

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Plastic waste from waste electrical and electronic equipment (WEEE) produced from a real-world commercial WEEE recycling centre has been processed using pyrolysisgasification using a two-stage reaction system to produce hydrogen. In the first stage, the plastic fraction was pyrolysed at 600 ºC and the evolved pyrolysis gases were passed directly to a second reactor at 800 ºC and reacted with steam in the presence of a Ni/Al 2 O 3 catalyst. In addition, high impact polystyrene (HIPS) and acrylonitrile butadiene styrene (ABS) which were the main components of the WEEE plastic were reacted to compare with the WEEE plastic. The results showed that the introduction of steam and the catalyst increased the yield of hydrogen. Increasing the nickel content in the catalyst also resulted in higher hydrogen yield. The comparison of the results of WEEE with those of HIPS and ABS showed that WEEE plastic was mainly composed of ABS. The catalyst, after reaction, showed significant deposition of coke composed of filamentous and layered type carbon. Overall the novel processing of waste plastic from electrical and electronic equipment using a two stage pyrolysis-gasification reactor shows great promise for the production of hydrogen.

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Coprecipitated Ni-alumina and NiCu-alumina catalysts of methane decomposition and carbon deposition. II. Evolution of the catalysts in reaction

Cited by 209 publications

References 10 publications

Controlling the yield and structure of carbon nanofibers grown on a nickel/activated carbon catalyst

Controlling the yield and structure of carbon nanofibers grown on a nickel/activated carbon catalyst

Methane Decomposition: Production of Hydrogen and Carbon Filaments

Thermal processing of plastics from waste electrical and electronic equipment for hydrogen production

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