Co-based catalysts from Co/Fe/Al layered double hydroxides for preparation of carbon nanotubes

Xiang, Xu; Zhang, Lu; Hima, Halidou I.; Li, Feng; Evans, David G.

doi:10.1016/j.clay.2008.04.004

Cited by 95 publications

(46 citation statements)

References 31 publications

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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: 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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Section: Introductionmentioning

confidence: 99%

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

2011

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“…Recently, we found that CNTs and CNFs could be synthesized by the high temperature catalytic chemical vapor deposition (CCVD) of acetylene over highly active cobalt-and nickel-based supported catalysts derived from layered double hydroxides (LDHs) [12][13][14]. LDHs, known as a family of synthetic anionic clays, are a class of brucite-like layered materials [15].…”

Section: Introductionmentioning

confidence: 99%

Helical nanocoiled and microcoiled carbon fibers as effective catalyst supports for electrooxidation of methanol

Zhang

2010

Electrochimica Acta

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“…LDHs may include variations, such as containing more than two species of the second cation (Kooli et al, 1995). Xiang et al (2009) also prepared Co/Fe/Al…”

Section: Outline Of the Dissertationmentioning

confidence: 99%