Microtexture of High Surface Area Activated Carbons

Shiraishi, Minoru; Yoshizawa, Noriko; Ohkawa, Katsumi; Maeda, Toyohiro

doi:10.7209/tanso.1992.295

Cited by 8 publications

(11 citation statements)

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“…In contrast to the carbons from the polymers, the CVD carbon with the 3 h deposition did not give any (002) peak even after isolation, indicating no stacking structure and extremely poor crystallinity of this carbon. A similar XRD pattern was reported for the activated carbons with high surface area, which were activated by KOH . On the other hand, a sharp (002) peak was observed for the carbon with the 12 h deposition.…”

Section: Discussionsupporting

confidence: 82%

“…A similar XRD pattern was reported for the activated carbons with high surface area, which were activated by KOH. 16 On the other hand, a sharp (002) peak was observed for the carbon with the 12 h deposition. The possible origin for this sharp peak would be the dense carbon layers on the outer surface of the carbon particles as observed in Figure 3.…”

Section: Discussionmentioning

confidence: 98%

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Formation of New Type of Porous Carbon by Carbonization in Zeolite Nanochannels

et al. 1997

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An attempt was made to prepare porous carbon by using the channels of Y zeolite as a template. Poly(acrylonitrile) and poly(furfuryl alcohol) were carbonized in the zeolite channels and the resultant carbon/zeolite complexes were subjected to acid treatment in order to extract carbon from the zeolite framework. In addition, pyrolytic carbon deposition in the channels was carried out by exposing the zeolite to propylene at high temperature, and then the carbon was liberated in the same manner as above. The morphology and structure of the carbon prepared in the channels were characterized, and the results were discussed in relation to the morphology and structure of the original zeolite template. It was found that the microscopic morphology of the resultant carbons reflects that of the corresponding zeolites. All of these carbons are highly porous, and some of the CVD carbons have BET surface areas as high as >2000 m 2 /g.

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Section: Discussionsupporting

confidence: 82%

Section: Discussionmentioning

confidence: 98%

Formation of New Type of Porous Carbon by Carbonization in Zeolite Nanochannels

et al. 1997

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“…The less well developed structure of the stacks of aromatic layers could allow the interlayer of aromatic layers to be an accessible micropore [54][55][56]. In the present study, inhibition of the development of the stacking in 0.0172 Fe-mech and 0.010 Ni-mech presumably gave rise to formation of accessible micropores, while PF with more developed stacking structure did not have accessible micropores.…”

Section: Samplementioning

confidence: 46%

“…This treatment led to ordered packing within the stacks, but closed micropores [58,59]. Activation caused burn-off of carbon, which resulted in degradation of the packing structure, and increase in accessible micropores [54][55][56]60]. However, activation also caused substantial weight loss of carbon, which led to fragility of the porous carbon product.…”

Section: Samplementioning

confidence: 99%

Formation and development of micropores in carbon prepared via catalytic carbonization of phenolic resin containing Fe or Ni compounds

Inomata¹,

Otake²

2011

Microporous and Mesoporous Materials

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“…XRD patterns in Figure for the blank sample and the mesoporous carbon prepared from TiO(acac) 2 commonly include a broad and weak peak around 2θ = 20−30°. This kind of peak is often found in XRD profiles of activated carbons , and can be related to the 002 band of graphite. A broad, weak intensity peak presumably indicates the presence of small stacking units of aromatic layers as crystallites.…”

Section: Resultsmentioning

confidence: 88%

Coal-Based Activated Carbons Prepared with Organometallics and Their Mesoporous Structure

Yoshizawa¹,

Yamada²,

Furuta³

et al. 1997

Energy Fuels

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The preparation of a mesoporous carbon was attempted by a steam activation of a mixture of coal and metal acetylacetonate at 900 °C. The resultant porosity of the activated carbon was influenced more by the type of acetylacetonate [Al(acac)3, Y(acac)3, TiO(acac)2, or Zr(acac)4)] than by the rank of the coal (Miike, Taiheiyo, and Morwell). Samples obtained from TiO(acac)2 showed a particularly high mesoporosity even at an early stage of activation, as evaluated by the BET and BJH analysis of the N2 adsorption isotherm. To clarify the influence of TiO(acac)2 on the mechanism of formation of a remarkable amount of mesopores, the structure of the activated carbon derived from the Ti complex was investigated by X-ray diffraction measurements and observations with a transmission electron microscope (TEM). The carbon matrix was composed of small graphite-like crystallites with mesopores and TiO2 (rutile and brookite) particles dispersed homogeneously throughout the whole matrix. The shape of the characteristic mesopores resembled that of the TiO2 particles. The particle size distribution determined by image analysis of a TEM photograph quantitatively shows the similarities in the average size of TiO2 particles and pores. It is believed that the formation of mesoporosity in the activated carbon is closely related to the migration of TiO2 from the carbon matrix.

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Microtexture of High Surface Area Activated Carbons

Cited by 8 publications

References 0 publications

Formation of New Type of Porous Carbon by Carbonization in Zeolite Nanochannels

Formation of New Type of Porous Carbon by Carbonization in Zeolite Nanochannels

Formation and development of micropores in carbon prepared via catalytic carbonization of phenolic resin containing Fe or Ni compounds

Coal-Based Activated Carbons Prepared with Organometallics and Their Mesoporous Structure

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