Synthesis of hydrogen and carbon nanotubes over copper promoted Ni/SiO2 catalyst by thermocatalytic decomposition of methane

Saraswat, Sushil Kumar; Pant, Kamal K.

doi:10.1016/j.jngse.2013.04.001

Cited by 118 publications

(54 citation statements)

References 31 publications

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“…The comparison of nitrogen adsorption/desorption isotherms indicates that for the catalysts with higher copper contents the hysteresis loop was formed at the higher partial pressure, indicating the presence of the larger pores and the decrease of the specific surface area [8,27]. This observation is in good agreement with the results presented in Table 1.…”

Section: Structural Properties Of Catalystssupporting

confidence: 89%

“…Copper is inactive in this process even at temperatures higher than 900 C and decreases the catalyst activity at low reaction temperatures [22,34]. However, due to the high affinity of copper and graphite structure, the copper addition prevents the formation of encapsulating carbon on the nickel surface, and consequently, the catalyst activity is maintained at higher temperatures [8,12]. Furthermore, copper can be effective in methane decomposition by preventing the NiAl 2 O 4 formation and facilitating the nickel reduction via alloy formation and increasing the methane adsorption [12,22,23].…”

Section: Catalytic Performancementioning

confidence: 99%

“…Moreover, this process produces valuable carbon material with many unique properties such as high surface area, high electric conductivity, high resistance to strong acids and bases and high mechanical strength as catalyst support and as a H 2 storage material [8,12,13]. Products formation in gaseous and solid phases in methane thermocatalytic decomposition leads to lack of complicated separation processes to remove carbon oxides, which make the process simpler and decreases the production cost [4].…”

Section: Introductionmentioning

confidence: 99%

See 2 more Smart Citations

Thermocatalytic decomposition of methane to COx-free hydrogen and carbon over Ni–Fe–Cu/Al2O3 catalysts

Bayat

Meshkani

Rezaei

2016

International Journal of Hydrogen Energy

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Section: Structural Properties Of Catalystssupporting

confidence: 89%

Section: Catalytic Performancementioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

See 1 more Smart Citation

Thermocatalytic decomposition of methane to COx-free hydrogen and carbon over Ni–Fe–Cu/Al2O3 catalysts

Bayat

Meshkani

Rezaei

2016

International Journal of Hydrogen Energy

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“…These results showed that for high Fe loaded catalyst a large number of Fe species penetrated and dispersed inside the pores of support, which resulted in smaller S BET and P.V due to partial blockage or coverage of pores of support material. Similar results were reported by several researchers in the literature [34,35]. …”

Section: Textural Propertiessupporting

confidence: 92%

Methane decomposition over Fe supported catalysts for hydrogen and nano carbon yield

Fakeeha

Ibrahim

Naeem

et al. 2015

Catalysis for Sustainable Energy

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Production of hydrogen, being an environmentally friendly energy source, has gained a lot of attention in the recent years. In this article, iron-based catalysts, with different active metal loadings, supported over magnesia and titania are investigated for hydrogen production via catalytic decomposition of methane. The catalytic activity and stability results revealed that magnesia supported catalysts performed better than titania supported catalysts. Hydrogen reduction temperature of 500°C was obtained suitable for catalyst activation. For magnesia supported catalysts, only higher loadings i.e., 30% and 40% Fe-Mg catalysts showed reasonable activity, while all titania supported catalysts presented less activity as well as deactivation. Among all the catalysts, 30% Fe/MgO catalyst displayed better activity. The formation of carbon nanofibers was evidenced from morphological analysis. FESEM and TEM images showed the generation of nonuniform carbon nanofibers with broader diameter. The catalysts were characterized using different techniques such as BET, H2-TPR, O2-TPO, XRD, TGA, FESEM and TEM.

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“…24 Ni/SiO2 catalysts have been widely used in hydrogen production. 25 However, studies of the influence of different preparation conditions using sol-gel methods for the preparation of Ni/SiO2 catalysts and the influence on ethanol steam reforming are very limited.…”

Section: Introductionmentioning

confidence: 99%

Investigation of Ni/SiO2 catalysts prepared at different conditions for hydrogen production from ethanol steam reforming

Dupont

Nahil

et al. 2017

Journal of the Energy Institute

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Ni/SiO2 catalysts prepared by a sol-gel method have been investigated for hydrogen production via steam reforming of ethanol using a continuous flow, fixed bed reactor system. Chemical equilibrium calculations were also performed to determine the effects of temperature and molar steam to carbon ratio on hydrogen production. The acidity of the preparation solution (modified by nitric acid and ammonia) and calcination atmosphere (air and N2) were investigated in the preparation of the catalysts. BET surface area and porosity, temperature-programmed oxidation (TPO), X-ray diffraction (XRD), transmission electron microscopy (TEM) and scanning electron microscopy (SEM) were used to characterise the prepared catalysts. The BET surface area was reduced when the solution acidity was lowered during the sol-gel preparation process. A pH value less than 2.0 was necessary to achieve high metal dispersion in the catalyst. Smaller NiO particles were obtained when the catalyst was calcined in N2. Material balances on ethanol steam reforming at 600 C using the prepared Ni/SiO2 catalysts were determined, and higher hydrogen production with lower coke deposition on the reacted catalysts were also obtained from the catalysts calcined in N2 atmosphere.

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Synthesis of hydrogen and carbon nanotubes over copper promoted Ni/SiO2 catalyst by thermocatalytic decomposition of methane

Cited by 118 publications

References 31 publications

Thermocatalytic decomposition of methane to COx-free hydrogen and carbon over Ni–Fe–Cu/Al2O3 catalysts

Thermocatalytic decomposition of methane to COx-free hydrogen and carbon over Ni–Fe–Cu/Al2O3 catalysts

Methane decomposition over Fe supported catalysts for hydrogen and nano carbon yield

Investigation of Ni/SiO2 catalysts prepared at different conditions for hydrogen production from ethanol steam reforming

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