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Indexed by:期刊论文

Date of Publication:2012-07-01

Journal:JOURNAL OF ANALYTICAL AND APPLIED PYROLYSIS

Included Journals:SCIE、EI、Scopus

Volume:96

Page Number:120-125

ISSN No.:0165-2370

Key Words:Petroleum coke; Activated carbon; Hydrogen; Activation

Abstract:KOH activation of petroleum coke (PC) was conducted with 30 vol% H-2 + 70 vol% N-2 as carrier gas. TG-DTG, FTIR, elemental analysis, N-2 adsorption, GC and XRD techniques were used to investigate the effects of hydrogen on the activation. During the initial stage of the activation, i.e. the carbonization of the PC, additional -CH- and -CH2- species were formed due to the chemisorption of hydrogen on the nascent sites of the PC created by the removal of the surface heteroatom groups. The formation of the -CH- and -CH2- species increased the quantity of 'active sites' which is favorable to the further activation reaction, and developed the porous structure of the activated carbons. The micropore volume and BET surface areas of the activated carbon prepared under 30 vol% H-2 + 70 vol% N-2 and with a relatively low KOH/PC weight ratio of 2:1 have been increased from 0.78 cm(3)/g and 1936 m(2)/g to 0.97 cm(3)/g and 2477 m(2)/g, respectively, compared to that prepared in pure N-2 atmosphere with the same KOH/PC ratio. (C) 2012 Elsevier B.V. All rights reserved.