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Preparation and characterization of activated carbon from a low rank coal

✍ Scribed by Tanzil Haider Usmani; Tamoor Wahab Ahmed; S.Zafar Ahmed; A.H.K. Yousufzai

Publisher: Elsevier Science
Year: 1996
Tongue: English
Weight: 534 KB
Volume: 34
Category: Article
ISSN: 0008-6223
DOI: 10.1016/0008-6223(95)00137-9

No coin nor oath required. For personal study only.

✦ Synopsis

Powdered activated carbon has been prepared from lignitic coal of Lakhra (Pakistan) by a chemical activation method using ZnCl, as an activating agent. Different process variables have been established after a series of experiments and an impregnation ratio of 1: 2, an activation temperature of 650°C and a duration of 1 hour have been found to be appropriate for its preparation. It has been found

that the char is obtained in high yield with iodine and methylene blue numbers of 990 and 205, respectively. Different parameters based on adsorption of benzene at 293 K under reduced pressure have been calculated using DR equation with micropore volume W,=O.46 cm3/g, an average pore width L= 0.98 nm and a microporous surface area S,, = 942 m2/g. The nonporous surface area S, calculated by the t/F method is 142 m'/g. FTIR spectra of this sample show the presence of acidic functional carboxylic groups developed on its surface after activation. Their predominance is further confirmed by neutralization with different alkalis.

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