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Indexed by:期刊论文

Date of Publication:2005-09-01

Journal:CARBON

Included Journals:SCIE、EI、Scopus

Volume:43

Issue:11

Page Number:2295-2301

ISSN No.:0008-6223

Key Words:petroleum coke; activated carbon; carbonization; activation

Abstract:The influence of pre-carbonization of petroleum cokes on the properties of the activated carbon precursors and final carbons activated with KOH was investigated by using TG-DTG, FTIR, XRD, and BET techniques. TG-DTG study revealed the decomposition of volatile species and FTIR analysis identified the presence of C-O, C-O-C, C-O-H and some alkyl species on the surface of the precursors. XRD results indicated that a disorder occurred after the carbonization at 500 degrees C and an order happened gradually with increasing the temperature. The decreases in the BET surface area and N-2 adsorption capacity coincided with the reduction of the functional species on the precursor surface with the increase of the pre-carbonization temperature. These surface functional species were proposed to play a key role in the porosity development during the KOH activation. First, they reacted with KOH to form the intermediate C-O-K species, then the resultants further reacted with the carbon of the precursor, and finally developed the porous structure. As a result, the surface area and the pore size distribution of the activated carbon can be controlled by optimizing the conditions of the pre-carbonization and activation processes. (C) 2005 Elsevier Ltd. All rights reserved.