Hydrogen production by methane decomposition: A review

Abbas, Hazzim F.; Daud, Wan Mohd Ashri Wan

doi:10.1016/j.ijhydene.2009.11.036

Cited by 796 publications

(401 citation statements)

References 118 publications

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“…The  CH4,5min obtained with the Fe/Al 2 O 3 catalyst at 700 ºC was zero, pointing out that the activation temperature for this catalyst in the CDB is over 700 ºC. Similar findings were reported by Li et al [47] and Abbas et al [48] when studying Fe-based catalyst in the CH 4 decomposition reaction. At higher temperatures (800 and 900 ºC), differences in  CH4,5min between Ni and Co-based catalysts were almost negligible while  CH4,5min obtained with the Fe/Al 2 O 3 catalyst were lower as compared to Ni and Co-based catalysts, especially at 800 ºC.…”

Section: Initial Conversions and Reaction Ratessupporting

confidence: 86%

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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Section: Initial Conversions and Reaction Ratessupporting

confidence: 86%

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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“…According to the previous studies, iron-group metals (Ni, Co and Fe) show the highest activity in the cracking of hydrocarbons (Abbas and Wan Daud 2010;Li et al 2011). Nickel is most widely used due to its low price and high activity, and its efficiency is confirmed by studies carried out in several scientific centres.…”

Section: Introductionmentioning

confidence: 90%

Effect of Cobalt Addition on the Activity of Nanocrystalline Iron Catalysts in the Cracking of Methane Reaction

Maj

Kocemba

Lendzion-Bieluń

et al. 2015

Adsorption Science & Technology

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ABSTRACT:The effect of cobalt addition on the activity of nanocrystalline iron catalysts in the cracking of methane reaction is studied. The composition and properties of the catalyst were determined by inductively coupled plasma optical emission spectrometry, X-ray diffraction and temperature-programmed reduction methods. The activity of the catalyst in the reaction was defined by measuring the concentration of hydrogen, which was determined by gas chromatography. After cracking of methane reaction, the sample coated with a carbon deposit was examined with scanning electron microscope with energydispersive spectrometer. The reaction yield in the direction of hydrogen acquisition for the catalyst with cobalt was above 80%, and after the regeneration process, the catalyst was still active at a very high level. The reaction path for the catalyst without the cobalt addition was performed in two steps, and the catalyst after the reaction was non-regenerative.

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“…Inert carbon represents an occasion of carbon sink and may therefore contribute to provide a carbon-negative SCP production. Counterintuitively, also usage of fossil fuel can provide an eco-friendly source of H 2 : unlike the currently used method of steam reforming, methane decomposition, also called the "thermal black" process, decomposes methane into H 2 and importantly, carbon black instead of CO 2 [68,69,70,71]. Carbon black is chemically inert, i.e.…”

Section: Two-stage Designsmentioning

confidence: 99%

Agriculture-independent, sustainable, fail-safe and efficient food production by autotrophic single-cell protein

Bogdahn¹

2015

Preprint

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Food production with plants consumes large amounts of water, occupies large areas of land and cannot guarantee food security beyond the 21st century. Industrial agriculture in particular, is destructive to the environment, fosters climate change in profound ways, deteriorates public health and causes high "hidden costs". Single-cell protein (SCP) represents an alternative with minimal carbon-, water-and land footprints. However, when grown on biowastes of industrial agriculture, heterotrophic SCP does not truly improve sustainability or food security.This hypothesis paper proposes autotrophic SCP bioprocess designs which enable sustainable, fail-safe and efficient production of edible biomass from CO 2 and N 2 or NH 3 . They can be driven by H 2 , CO or HCOOH from several sustainable sources. Besides H 2 O-electrolysis and syngas, surprisingly fossil fuels may provide an effectively carbon-negative and cheap supply of H 2 through the decomposition of CH 4 or oil. Most promising bioprocess designs consist of 2-stages. In the 1 st stage, homoacetogenic bacteria fix CO 2 up to 10 more efficiently than plants, and secrete it as acetate. In the 2 nd stage, selected microbes grow on the acetate and thereby form edible biomass. Bacteria have unique features including N 2 -fixation, H 2 S tolerance and O 2 -tolerant hydrogenases for fast lightindependent growth. Eukaryotic microalgae are already approved as food and exhibit oxygenic photosynthesis which partly replaces solar-panels, seawater desalination and H 2 O-electrolyzers. Photoheterotrophic growth on acetate decouples these benefits from inefficient endogenous CO 2 fixation. Slow gas mass-transfer, poor light distribution and expensive cell harvest are major challenges arising from the cultivation in liquid media. To cope with this, microbes grow as hydrated biofilms that are exposed directly to substrate gases, and that can be dry-harvested. Two suitable bioreactors are presented and adaptations for 2-stage designs are proposed. Since provision with substrates is expensive, two strategies are proposed for the safe extraction of substrates from food-grade as well as non-food-grade biowastes via partial anaerobic digestion. Additionally, alkalic pH and hydroxides formed at the cathode during electrolysis may be used to precipitate CO 2 from the air as carbonates. In two use cases, 2-stage designs with solar-powered H 2 -generation from seawater were estimated to exceed productivity of wheat 20-200 fold, for moderate and arid climates respectively. Preliminary cost estimates and data about direct and indirect subsidies of industrial agriculture lead to the hypothesis that autotrophic SCP likely outperforms industrial agriculture not only in ecological but also in economical aspects.

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Hydrogen production by methane decomposition: A review

Cited by 796 publications

References 118 publications

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

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

Effect of Cobalt Addition on the Activity of Nanocrystalline Iron Catalysts in the Cracking of Methane Reaction

Agriculture-independent, sustainable, fail-safe and efficient food production by autotrophic single-cell protein

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