Production of COx-free hydrogen and nanocarbon by direct decomposition of undiluted methane on Ni–Cu–alumina catalysts

Chen, Jiuling; Li, Yongdan; Li, Zongquan; Zhang, Xixiang

doi:10.1016/j.apcata.2004.04.016

Cited by 139 publications

(55 citation statements)

References 30 publications

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“…Various studies on CH 4 decomposition have been carried out over metal-based catalysts, such as Ni or Cu [23][24][25][26]. It has been found that CH 4 initial conversions are often higher when activated carbons are used as catalyst, but it is the metallic catalyst that shows the best long-term behaviour, high conversions being achieved even after 5-10 h. Taking into account that these tests were run at lower temperatures, it can be inferred that, in general, activated carbon displays a worse performance as a catalyst than metal-based catalysts.…”

Section: Resultsmentioning

confidence: 99%

Microwave-assisted catalytic decomposition of methane over activated carbon for CO2CO2-free hydrogen production

Domı́nguez

Fidalgo

Fernández

et al. 2007

International Journal of Hydrogen Energy

136

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Section: Resultsmentioning

confidence: 99%

Microwave-assisted catalytic decomposition of methane over activated carbon for CO2CO2-free hydrogen production

Domı́nguez

Fidalgo

Fernández

et al. 2007

International Journal of Hydrogen Energy

136

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“…This reaction has attracted attention in recent years because it produces pure and CO-free hydrogen and solid carbon [5,[8][9][10][11][12]. The advantage is that the hydrogen produced by this route could be used directly in fuel cells, which tolerate only very low levels of CO [13,14].…”

Section: Introductionmentioning

confidence: 98%

“…In addition, well-dispersed metallic particles are usually obtained after reduction treatment [22,23]. Studies in the literature for methane decomposition were carried out using mostly nickel as the active component [5,7,8,10,12,20,24], while Co-based catalysts have received less attention [25].…”

Section: Introductionmentioning

confidence: 99%

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

2011

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The catalytic decomposition of methane over M-Co-Al (M = Mg, Ni, Zn, Cu) was studied. The samples were prepared by co-precipitation and characterized by S BET , TGA, DTA, TPR and XRD. The carbon produced in the reaction was characterized by SEM and TPO. Activity tests were carried out in a thermobalance between 500 and 750°C. The results show that the textural properties of the calcined samples did not change significantly with the partial substitution of Co by Mg, Ni, Zn or Cu. On the other hand, there were marked differences in the reduced samples. There was a strong influence on the reducibility of cobalt oxides in the presence of Ni or Cu. Nickel promoted the reduction of Co 3 O 4 at the same temperature as the NiO phase, whereas copper strongly decreased the reduction temperature of both Co 3 O 4 and CoAl 2 O 4 due to a synergistic effect between Cu and Co. The sample containing Cu resulted in low catalytic activity in the whole temperature range because the reduction conditions promoted the formation of a Cu-Co alloy. In the reaction carried out at 700°C, the observed activity was Co-Al [ Mg-CoAl [ Ni-Co-Al. All the samples were deactivated by encapsulation under these conditions due to high rates of carbon deposition. The carbon produced was mainly carbon nanotubes, except for the Cu-Co-Al sample, which produced mostly amorphous carbon.

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“…This posed a problem for their commercial application. The examined operating temperatures for Ni-based catalysts ranged from 500 to 900 • C with the highest methane conversion of 67% at 700 • C [6][7][8][9][10][11][12], while for the Fe-based catalysts methane conversion reached 79% at 830 • C and the operating temperatures ranged from 200 to 1200 • C [2,[15][16][17][18]. Regeneration of the catalyst included burning off the catalyst surface or gasification with steam but in both cases the process involved emission of CO x .…”

Section: Introductionmentioning

confidence: 99%

“…TCM has been widely reported in the literature [3][4][5][6][7][8][9][10][11][12][13][14][15][16][17][18][19] since early 1960s and the catalysts being studied in this process consist mainly of transition metals such as Ni, Co, and Fe. Catalysts based on Ni and Fe have shown to be the most effective.…”

Section: Introductionmentioning

confidence: 99%