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Effect of template constraints on adsorption properties of synthetic carbons prepared within the gallery of layered double hydroxides

✍ Scribed by K. Putyera; T.J. Bandosz; J. Jagieo; J.A. Schwarz


Publisher
Elsevier Science
Year
1996
Tongue
English
Weight
700 KB
Volume
34
Category
Article
ISSN
0008-6223

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✦ Synopsis


Mg-Al layered double hydroxides

have been synthesized and l$naphthalene disulfonate dianions have been intercalated; the organic molecules were carbonized within the layered framework. For comparison, a reference carbon was prepared from the sodium salt of the l$naphthalene disulfonic acid precursor using conventional carbonization under the same thermal and post-treatment conditions. The surface properties of the carbonized product extracted from the carbon-mixed oxide nanocomposite have been studied by adsorption techniques and the results compared to the adsorption characteristics of the reference carbon. The sorption of nitrogen at 77 K and carbon dioxide at 298 K demonstrate that, although the two carbons have almost the same specific surface area and total pore volumes, there is a significant difference in their micropore structure. Micropore size distributions calculated from adsorption isotherms of methane and sulfur hexafluoride at near ambient temperatures reveal a more heterogeneous micropore structure for the template derived carbon compared to the reference. The factors controlling micropore structure development during two-dimensional carbonization are discussed based on DTA, results of sorption of carbon dioxide and FTIR spectroscopic measurements.


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