Metal–support interaction effects on the growth of filamentous carbon over Co/SiO2 catalysts

Li, Xiaonian; Zhang, Yi; Smith, Kevin J.

doi:10.1016/j.apcata.2003.12.031

Cited by 54 publications

(27 citation statements)

References 34 publications

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“…The transition metals such as Fe, Co, Cu, and Ni [13][14][15][16][17] have been reported as active components for methane decomposition reaction. However, the Ni-based catalysts are known to be more active at low temperatures and provide a higher yield of carbon per mass unit of the active component.…”

Section: Cdm Activities Over Ni Supported Systemsmentioning

confidence: 99%

“…In recent years, filaments and nanotubes of various types have been synthesized and textural and adsorptive properties of this material, as well as kinetics and thermodynamics of formation over different catalysts, have been studied [11,12]. Several prior studies are reported on CDM using transition metals such as Fe, Co, Cu, and Ni [13][14][15][16][17]. However, the nickel-based catalysts are known to be more active at low temperatures and provide a higher yield of carbon per mass unit of the active component.…”

Section: Introductionmentioning

confidence: 98%

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Development of Methane Decomposition Catalysts for COx Free Hydrogen

2008

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Now-a-days, catalytic decomposition of methane (CDM) into hydrogen and carbon is a promising technique for production of fuel cell grade hydrogen. The Ni based catalysts seems promising particularly for the production of CO x free H 2 by methane decomposition process. The CDM activity and longevity of the Ni based catalysts are mainly influenced by the amount of Ni and type of support material. In this paper the CDM activity results are correlated with NiO crystallite size, Ni metal surface area and acidity of the catalysts. In case of bimetallic catalysts addition of Cu to Ni catalysts lead to enhance the CDM activity at higher temperature thus resulting in the increased concentration of hydrogen in the outlet stream. Finally, some of the carbon-based catalysts are studied for methane decomposition activity at higher temperature. The surface changes over carbon catalysts with methane decomposition are studied using various characterization techniques.

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Section: Cdm Activities Over Ni Supported Systemsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 98%

Development of Methane Decomposition Catalysts for COx Free Hydrogen

2008

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“…The TPR Fig. 4 Experimental (symbols) and model (lines) isotherms for the adsorption of carbon dioxide at 273 K curves of Co/(MT-Al) samples having a metal loading of about 0.5 wt% or higher, have a first peak at 640 K corresponding to the reduction of bulk-like cobalt oxide particles (Sin and Chen 2004;Li et al 2004). The reduction peak above 1090 K indicates the presence of Co species that interact strongly with the support, such as spinel type Co 2 SiO 4 compounds (Ernst et al 1999).…”

Section: Resultsmentioning

confidence: 98%

Adsorption of CO2 as a method for the characterisation of the structure of alumina-pillared clay catalysts

2009

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The aim of this work was to study the effect of the metal loading on the structure of two series of cobalt and manganese pillared clay-supported catalysts. For this purpose, equilibrium data for CO 2 adsorption at 273 K were analysed using Freundlich, Langmuir and Toth isotherm models, in order to estimate the adsorption parameters and to relate them with the metal loading of the catalysts. The metal distributions on the porous structure of the catalysts were studied using the temperature programmed reduction results combined with information from the nitrogen physisorption data. Comparison of all results reveals that up to a certain metal loading, about 0.5 wt% of Co and 2 wt% of Mn, the metal oxide is well dispersed into the porous structure of the pillared clay. At higher metal loadings, bulkmetal oxide particles are formed on the external surface.

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“…Hence, if the rate of the carbon gasification by CO 2 is less than the rate of carbon formation, the large volume of carbon deposit will accumulate over gas-metal interface, which can afterward polymerize. These polymerized carbon atoms can contribute to catalysts deactivation via two ways: (i) encapsulating the active metal particles or diffusing through the active metal after dissolving, and (ii) detaching active metal particles from the support [20]. It is believed that the carbon formation is more easily favored by acidic supports than basic supports and additionally, coke deposition occurs more easily on bigger particles than smaller ones [21].…”

Section: Catalyst Deactivation and Co Pulse Chemisorptionmentioning

confidence: 99%

Syngas Production from Dry Reforming of Methane over Nano Ni Polyol Catalysts

Naeem¹,

Al‐Fatesh²,

Khan³

et al. 2013

IJCEA

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Abstract-Dry reforming of methane (DRM) is an environment friendly process since it utilizes two major greenhouse gases (CH 4 and CO 2 ) to produce valuable syngas. Polyol process was adopted to prepare nano supported (Al 2 O 3 , ZrO 2 and CeO 2 ) Ni based nano catalysts for DRM reaction. All catalysts were prepared in ethylene glycol medium with polyvinylpyrrolidone as a nucleation-protective agent. The main objective of this study was to develop a suitable catalyst, for syngas production, which possessed high activity, stability and minimum coking rate during DRM. The catalytic activities of the prepared catalysts were evaluated in the temperature range 500-800°C. The obtained results revealed that catalytic performance depends on the nature of support. Amongst all tested catalysts, Ni-Zr Pol showed highest activity (87.2%) and stability (%D.F= -0.46). On the other hand Ni-Al Pol catalyst exhibited acceptable activity (84.8%) with minimum coking rate (0.015 g/g cat .h) while Ni-Ce Pol showed smallest activity (83.2%) with large amount of coke deposition (0.025 g/g cat .h).Index Terms-CO 2 /CH 4 reforming, nano-Ni, nano support, polyol method, activity.

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Metal–support interaction effects on the growth of filamentous carbon over Co/SiO2 catalysts

Cited by 54 publications

References 34 publications

Development of Methane Decomposition Catalysts for COx Free Hydrogen

Development of Methane Decomposition Catalysts for COx Free Hydrogen

Adsorption of CO2 as a method for the characterisation of the structure of alumina-pillared clay catalysts

Syngas Production from Dry Reforming of Methane over Nano Ni Polyol Catalysts

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