Catalytic Decomposition of Methane Over M–Co–Al Catalysts (M = Mg, Ni, Zn, Cu)

Hermes, Natanael Augusto; Lansarin, Marla Azário; Perez‐Lopez, Oscar W.

doi:10.1007/s10562-011-0611-5

Cited by 55 publications

(33 citation statements)

References 55 publications

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“…The latter behaviour depicts a stronger interaction between the Co oxide and the MgO-or CaO-modified support, which requires higher temperatures to be reduced. These results follow the same trend observed for other Mg-CoAl and for CaO-Ni/Al 2 O 3 catalysts with similar loadings for the promoters 14,16,29 . Among the M-Co-Al catalysts, the LaCoAl sample exhibits well-defined behaviour, because both reduction peaks are located at significantly lower temperatures.…”

Section: Resultssupporting

confidence: 89%

“…Amorphous carbon oxidises at approximately 400°C, while the DTA peaks in Figure 8 are centred at ca. 490°C, which could be assigned to carbon nanotubes or nanofibres 27,29,42 . Therefore, the TPO/DTA analysis suggests that filamentous carbon is formed for the Co-Al samples investigated herein.…”

Section: Resultsmentioning

confidence: 99%

“…The active metal ions should be surrounded by other ions that might minimise aggregation and thus prevent sintering and coke formation 26 . Additionally, promising results have been achieved by similar mixed oxide materials based on cobalt in different processes [29][30][31] , and these results lead to the investigation of dry reforming of CH 4 on Co-mixed oxide catalysts.…”

Section: Introductionmentioning

confidence: 98%

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Dry reforming of methane at moderate temperatures over modified Co-Al Co-precipitated catalysts

2014

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M-Co-Al (M = Ca, La, Li or Mg) materials were synthesised by co-precipitation and investigated for dry reforming of methane. Thermogravimetry, temperature-programmed oxidation, reduction and CO 2 desorption, specific area and X-ray diffraction were utilised for characterisation. Activity tests were conducted at atmospheric pressure, temperatures between 400-550°C , CH 4 /CO 2 molar ratio of 1 and GHSV of 6000 NmL CH 4 ·g -1 ·h -1 . The partial substitution of Co by a third element increased the area and changed the acid/base properties, reducibility and crystallinity of the oxides. These modifications resulted in higher activity for dry reforming of methane, mainly related to the decrease in the acidity of the promoted materials and, consequently, lower carbon formation. The Li-modified sample presented the lowest coke deposition due to the increase in stronger basic sites. The Mg-promoted catalyst exhibited the best activity performance. This depicts the enhancement in the reducibility and acid/base properties found in the MgCoAl sample.

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Section: Resultssupporting

confidence: 89%

Section: Resultsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 98%

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Dry reforming of methane at moderate temperatures over modified Co-Al Co-precipitated catalysts

2014

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“…The active and stable catalysts for biogas reforming are mostly noble metals, such as rhodium, palladium, iridium, platinum and ruthenium [38] besides inexpensive nickel which, however, is very active to coke deposition [39]. On the other hand, the addition of other metal, such as platinum, palladium, cobalt, molybdenum and copper can improve the catalytic performance of nickel [40,41]. Aiming to obtain active and stable catalysts for producing hydrogen from biogas, catalysts based on nickel and copper supported on aluminum and magnesium oxides were studied in this work.…”

Section: Introductionmentioning

confidence: 99%

Evaluation of nickel and copper catalysts in biogas reforming for hydrogen production in SOFC

Silva

Martins

Ballarini³

et al. 2017

Matéria (Rio J.)

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The solid oxide fuel cells (SOFC) enable the efficient generation of clean energy, fitting the current requirements of the growing demand for electricity and for the environment preservation. When powered with biogas (from digesters of municipal wastes), the SOFCs also contribute to reduce the environmental impact of these wastes. The most suitable route to produce hydrogen inside SOFC from biogas is through dry reforming but the catalyst is easily deactivated by coke, because of the high amounts of carbon in the stream. A promising way to overcome this drawback is by adding a second metal to nickel-based catalysts. Aiming to obtain active, selective and stable catalysts for biogas dry reforming, solids based on nickel (15%) and copper (5%) supported on aluminum and magnesium oxide were studied in this work. Samples were prepared by impregnating the support with nickel and copper nitrate, followed by calcination at 500, 600 and 800 o C. It was noted that all solids were made of nickel oxide, nickel aluminate and magnesium aluminate but no copper compound was found. The specific surface areas did not changed with calcination temperature but the nickel oxide average particles size increased. The solids reducibility decreased with increasing temperature. All catalysts were active in methane dry reforming, leading to similar conversions but different selectivities to hydrogen and different activities in water gas shift reaction (WGSR). This behavior was assigned to different interactions between nickel and copper, at different calcination temperatures. All catalysts were active in WGSR, decreasing the hydrogen to carbon monoxide molar ratio and producing water. The catalyst calcined at 500 o C was the most promising one, leading to the highest hydrogen yield, besides the advantage of being produced at the lowest calcination temperature, requiring less energy in its preparation.

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“…Some authors reported on methane to carbon nanotubes or nanoparticles decomposition over cobalt contained catalysts [8,9], but to the best of our knowledge, there is no information on nanotubes filled with continuous cobalt nanowires prepared from methane.…”

Section: Introductionmentioning

confidence: 99%

Low temperature one-step synthesis of cobalt nanowires encapsulated in carbon

Majewska

Michalkiewicz

2013

Appl. Phys. A

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The one-step method of carbon nanotubes filled with continuous cobalt nanowires (CoF-CNT) synthesis is presented. Co/ZSM-5 (8 wt% Co) was used as catalyst for CoF-CNT production by methane decomposition at the temperature of 400°C and 800°C at atmospheric pressure in a conventional gas-flow system. The average diameter of the CoF-CNT is about 25 and 40 nm for products obtained at 400°C and at 800°C, respectively. The average size of coherently scattering domains along the normal to graphite layers L c , the interlayer spacing d 002 , the graphitization degree of carbon, and the relative intensities of the G and D bands in Raman spectroscopy were determined to characterize the quality of carbon. It was proved that cobalt-filled carbon nanotubes can be produced by a simple method. The results of XRD, FE-SEM, and TEM show that CoF-CNT can be obtained even at 400°C by catalytic decomposition of methane. On the basis of XRD, TEM, Raman spectroscopy was found that at a temperature of 800°C, a better quality of carbon was produced.

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Catalytic Decomposition of Methane Over M–Co–Al Catalysts (M = Mg, Ni, Zn, Cu)

Cited by 55 publications

References 55 publications

Dry reforming of methane at moderate temperatures over modified Co-Al Co-precipitated catalysts

Dry reforming of methane at moderate temperatures over modified Co-Al Co-precipitated catalysts

Evaluation of nickel and copper catalysts in biogas reforming for hydrogen production in SOFC

Low temperature one-step synthesis of cobalt nanowires encapsulated in carbon

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