Opposite effects of gas flow rate on the rate of formation of carbon during the pyrolysis of ethane and acetylene on a nickel mesh catalyst

Lee, Woojin; Li, Chun‐Zhu

doi:10.1016/j.carbon.2008.04.023

Cited by 31 publications

(12 citation statements)

References 47 publications

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“…As already reported, 49,50 the presence of species such as NiO crystallites that interact weakly with the support (free NiO), is responsible for the carbon formation on nickel catalysts. Thus, this kind of free NiO, identied in the TPR prole of the catalyst 5% Ni50CZ in Fig.…”

Section: Characterization Of Spent Catalyst Aer the Srg Reactionsupporting

confidence: 57%

Catalytic features of Ni supported on CeO₂–ZrO₂solid solution in the steam reforming of glycerol for syngas production

Maia

Assaf

2014

RSC Adv.

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Section: Characterization Of Spent Catalyst Aer the Srg Reactionsupporting

confidence: 57%

Catalytic features of Ni supported on CeO₂–ZrO₂solid solution in the steam reforming of glycerol for syngas production

Maia

Assaf

2014

RSC Adv.

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“…The importance of mass transfer in the formation of carbon on bulk nickel during hydrocarbons pyrolysis was established previously in work. 13 The peculiarities of carbon deposition were reasonably explained by considering the relative ease with which various hydrocarbon radicals and hydrogen radicals desorb from the nickel surface with increasing gas flow rate. The desorption behavior correlates with known bonding strengths between nickel and radicals under consideration.…”

Section: Discussionmentioning

confidence: 99%

Increased Carbon Chemical Vapor Deposition and Carbon Nanotube Growth on Metal Substrates in Confined Spaces

Kukovitsky

L’vov

2012

ECS J. Solid State Sci. Technol.

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Experimental study of carbon deposition and carbon nanotube growth between stacked metallic substrates was conducted. The batch chemical vapor deposition (CVD) reactor was used with polyethylene as the carbon precursor. Increased carbon deposition was established on surfaces between stacked nickel substrates as compared to surfaces facing to open spaces. In general case carbon films deposited between substrates were not uniform giving rise to complicated profiles. The simple diffusion-reaction scheme gives carbon film thickness profiles closely resembling those experimentally observed. This similarity is considered as evidence of homogeneous-heterogeneous reaction sequences proceeding in narrow gap between catalytically active surfaces. Increased carbon nanotube growth was believed to occur as a result of the involvement of hydrocarbon radicals generated by the catalyst surface with subsequent release into the gas phase. Radicals accelerate gas-phase reactions providing reactive intermediates. Ultimately catalytic gas phase activation in the confined space promotes increased carbon formation. An explanation of the experimental results is proposed and a practical application was demonstrated.Carbon films and layers on supporting substrates are perspective components for an increasing number of potential applications. Chemical vapor deposition (CVD) is the preferred method to produce carbon films on substrates. For carbon materials obtained by CVD process carbon species and their properties are determined by the interacting influences of hydrodynamics and chemical kinetics, which in turn depend on the reactor type, process conditions (chemical precursor, temperature, temperature gradients, pressure), surface catalytic properties and may be affected also by extrinsic factors as gas or surface impurities, surface configuration and surface morphology. The vast majority of experimental works to produce carbon films or layers has been made using the crystalline silicon as a substrate. In particular, carbon nanotubes (CNT) are frequently being synthesized on silicon with coated catalyst (Ni, Fe, Co and alloys). This is commonly justified by the need for compatibility with technologies of modern microelectronics. There exist, however, many applications for which the use of metallic substrates is preferable to other materials or essential for device performance. The considerable effort has been devoted to the synthesis of CVD diamond films on metal substrates at low temperatures and pressures. 1-3 Such films have great potential for applications in microelectronic devices, as tools, heat sinks, hard coatings, corrosion and wear resistant surfaces. CVD techniques for producing diamond films require a means of activating gas-phase carbon-containing precursor molecules. Thermal or plasma activation procedures generate hydrogen and hydrocarbon radicals which participate in surface chemical reactions resulting in film growth. In fact, the same procedures are now widely used in nanotube CVD processes to low synthesis temperature...

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“…It is known that the type of carbon formed is inuenced by the particle size. 29 The type of carbonaceous deposits formed may decrease the performance of the catalyst in the steam reforming reaction of ethanol. Carbon bre laments allow the metallic cobalt to remain exposed to the reactants for a longer period of time, causing the catalyst to remain active throughout the reaction, which explains its good performance and nondeactivation, despite the presence of carbon (Table 4).…”

Section: Catalytic Testmentioning

confidence: 99%

Effects of adding basic oxides of La and/or Ce to SiO₂-supported Co catalysts for ethanol steam reforming

2014

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Opposite effects of gas flow rate on the rate of formation of carbon during the pyrolysis of ethane and acetylene on a nickel mesh catalyst

Cited by 31 publications

References 47 publications

Catalytic features of Ni supported on CeO₂–ZrO₂solid solution in the steam reforming of glycerol for syngas production

Catalytic features of Ni supported on CeO₂–ZrO₂solid solution in the steam reforming of glycerol for syngas production

Increased Carbon Chemical Vapor Deposition and Carbon Nanotube Growth on Metal Substrates in Confined Spaces

Effects of adding basic oxides of La and/or Ce to SiO₂-supported Co catalysts for ethanol steam reforming

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Opposite effects of gas flow rate on the rate of formation of carbon during the pyrolysis of ethane and acetylene on a nickel mesh catalyst

Cited by 31 publications

References 47 publications

Catalytic features of Ni supported on CeO2–ZrO2solid solution in the steam reforming of glycerol for syngas production

Catalytic features of Ni supported on CeO2–ZrO2solid solution in the steam reforming of glycerol for syngas production

Increased Carbon Chemical Vapor Deposition and Carbon Nanotube Growth on Metal Substrates in Confined Spaces

Effects of adding basic oxides of La and/or Ce to SiO2-supported Co catalysts for ethanol steam reforming

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Catalytic features of Ni supported on CeO₂–ZrO₂solid solution in the steam reforming of glycerol for syngas production

Catalytic features of Ni supported on CeO₂–ZrO₂solid solution in the steam reforming of glycerol for syngas production

Effects of adding basic oxides of La and/or Ce to SiO₂-supported Co catalysts for ethanol steam reforming