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Preparation of Porous Carbons from Phenol–formaldehyde Resins with Chemical and Physical Activation by Hsisheng Teng; Sheng-Chi Wang is a Materials Science article available to read on EtoBox.

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Porous carbons with high porosities were prepared from phenol-formaldehyde resins using chemical and physical activation methods. The resin precursor employed was synthesized with an initial formaldehyde-to-phenol ratio of 1.33 by mole. The chemical activation process consisted of KOH impregnation followed by carbonization in nitrogen at 500-9008C for 0-3 h, whereas the physical activation was performed by carbonizing the resins at 9008C followed by gasifying the char in CO to different degrees of burn-off. Both activation methods can produce carbons with surface areas and pore volumes 2 2 3 greater than 2000 m / g and 1.0 cm / g, respectively. The influence of different parameters during chemical activation, such as carbonization temperature and time, KOH / resin ratio and heating rate, on the carbon yield and the surface characteristics was explored, and the optimum preparation conditions were determined. With physical activation the resulting carbons are mainly microporous and their porosity is an increasing function of the degree of burn-off. At similar porosity levels the carbon yield during physical activation was found to be lower than that with chemical activation. An SEM s

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Author

Hsisheng Teng; Sheng-Chi Wang

Publisher

Elsevier Science; Elsevier ; Elsevier Ltd.; Elsevier BV (ISSN 0008-6223)

Published

2000

Language

EN

Field

Materials Science (Physical Sciences)