Gasification of carbon deposits on nickel catalysts

Figueiredo, José L.; Trimm, D.L.

doi:10.1016/0021-9517(75)90241-9

Cited by 93 publications

(26 citation statements)

References 9 publications

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“…It is reported by Figueiredo and Trimm [46] that the gasification of filamentous carbons, such as CNTs, occurs as the reverse of their formation mechanism, and that the rate of gasification is independent of the amount of carbon deposited on supported catalysts. This would suggest that CNTs are formed when the rate of gasification of the deposited carbons is less than the rate of formation.…”

Section: Effect Of Steam On Carbon Depositionmentioning

confidence: 99%

Control of steam input to the pyrolysis-gasification of waste plastics for improved production of hydrogen or carbon nanotubes

Acomb

2014

Applied Catalysis B: Environmental

166

102

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Carbon nanotubes (CNTs) have been proven to be possible as high-value by-products of hydrogen production from gasification of waste plastics. In this work, steam content in the gasification process was investigated to increase the quality of CNTs in terms of purity.Three different plastics -low density polyethylene (LDPE), polypropylene (PP) and polystyrene (PS) were studied in a two stage pyrolysis-gasification reactor. Plastics samples were pyrolysed in nitrogen at 600°C, before the evolved gases were passed to a second stage where steam was injected and the gases were reformed at 800°C in the presence of a nickelalumina catalyst. To investigate the effect that steam plays on CNT production, steam injection rates of 0, 0.25, 1.90 and 4.74 g h -1 were employed. The CNTs produced from all three plastics were multiwalled CNTs with diameters between 10 and 20 nm and several microns in length. For all the plastic samples, raising the steam injection rate led to increased hydrogen production as steam reforming and gasification of deposited carbon increased. High quality CNTs, as observed from TEM, TPO and Raman spectroscopy, were produced by controlling the steam injection rate. The largest yield for LDPE was obtained at 0 g h -1 steam injection rate, whilst PP and PS gave their largest yields at 0.25 g h -1 . Overall the largest CNT yield was obtained for PS at 0.25 g h -1 , with a conversion rate of plastic to CNTs of 32% wt.

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Section: Effect Of Steam On Carbon Depositionmentioning

confidence: 99%

Control of steam input to the pyrolysis-gasification of waste plastics for improved production of hydrogen or carbon nanotubes

Acomb

2014

Applied Catalysis B: Environmental

166

102

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“…Moreover, char can act as a catalyst support to disperse the active clusters at nanoscale [24]. The deactivated char can be gasified without the need of frequent regeneration (e.g., (R1)) [25].…”

Section: Introductionmentioning

confidence: 99%

Catalytic reforming of pyrolysis tar over metallic nickel nanoparticles embedded in pyrochar

Shen

Chen

Sun

et al. 2015

Fuel

110

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“…These slight changes are due to the removal of surface oxygen functionalities that may have twofold impacts: first, widening the pore widths, and second, contributing to the weight loss of samples; thus increasing the weight-normalized surface area is most likely due to carbon catalytic gasification by metallic copper and nickel at 800 °C [46,47]. Unlike other ACFH samples, ACFH-Ni 0 has a considerable (~14%) mesoporosity that is created by pore widening of ACFH during the high temperature hydrogen treatment, due to catalytic gasification of carbon by hydrogen in the presence of zero-valent nickel [48]. AC is a mesoporous activated carbon that has a micropore volume comparable to the ACF but also contains a high mesopore volume.…”

Section: Porosity Characterizationmentioning

confidence: 99%

Adsorption of Thiophenic Compounds from Model Diesel Fuel Using Copper and Nickel Impregnated Activated Carbons

2012

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Adsorption of sulfur compoundsby porous materials is an effective way to produce cleaner diesel fuel.In this study, adsorption of refractory thiophenic sulfur compounds, i.e., benzothiophene (BT), dibenzothiophene (DBT), and 4,6-dimethyldibenzothiophene (4,6-DMDBT) in single-solute systems from n-hexane solutions onto metal-impregnated activated carbons was investigated. A hydrogen-treated activated carbon fiber was selectively loaded with Ni, NiO, Cu, Cu 2 O, and CuO species to systematically assess the impact of each metal species on the adsorption of thiophenic compounds (TC). Metal-loaded adsorbents had the same total metal contents and similar microporosities, but contained different types of copper or nickel species. All metal-loaded adsorbents showed enhanced adsorption of tested TC. Cu 2 O-or NiO-loaded adsorbents exhibited the highest uptakes, due to more specific interactions between Cu + or Ni 2+ species and TC molecules. The theoretical monolyer coverage of TC on the exposed Cu + sites was estimated and compared with that calculated from the experimental data. Results suggested catalytic conversion of TC molecules to other compounds on the Cu + sites, followed by adsorption of reaction products onto the carbon surface or multilayer accumulation of TC molecules on the Cu + sites. TC adsorption uptake of the majority of adsorbents followed the order of: 4,6-DMDBT > DBT > BT due to higher intensity of specific and non-specific interactions of larger TC molecules with adsorbents.

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Gasification of carbon deposits on nickel catalysts

Cited by 93 publications

References 9 publications

Control of steam input to the pyrolysis-gasification of waste plastics for improved production of hydrogen or carbon nanotubes

Control of steam input to the pyrolysis-gasification of waste plastics for improved production of hydrogen or carbon nanotubes

Catalytic reforming of pyrolysis tar over metallic nickel nanoparticles embedded in pyrochar

Adsorption of Thiophenic Compounds from Model Diesel Fuel Using Copper and Nickel Impregnated Activated Carbons

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