Preparation of activated carbon from needle coke via two-stage steam activation process

•Mesoporous activated carbon was prepared from needle coke via two-stage steam activation process.•The activated needle cokes treated by 1st steam activation exhibited the highest specific surface area of 643.3 m2/g.•2nd steam activation using the naphthalene makes the average pore diameter to incre...

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Bibliographic Details
Published in:Materials letters 2019-02, Vol.237, p.22-25
Main Authors: Im, Ui-Su, Kim, Jiyoung, Lee, Seon Ho, Lee, Song mi, Lee, Byung-Rok, Peck, Dong-Hyun, Jung, Doo-Hwan
Format: Article
Language:English
Subjects:
Activated carbon
Activation
Coke
High temperature
Impregnation
Low molecular weights
Materials science
Microscopy
Naphthalene
Needle coke
Pitch
Polarized light
Pore size
Porosity
Scanning electron microscopy
Steam activation
Thermogravimetric analysis
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Summary:•Mesoporous activated carbon was prepared from needle coke via two-stage steam activation process.•The activated needle cokes treated by 1st steam activation exhibited the highest specific surface area of 643.3 m2/g.•2nd steam activation using the naphthalene makes the average pore diameter to increase.•The highest specific surface area and average pore diameter showed 1134.3 m2/g and 2.77 nm via two-stage steam activation. Mesoporous activated carbon was prepared from needle coke via two-stage steam activation process under high temperature. Two-stage steam activation method involves three main steps: 1st steam activation to generate mesopores and macropores above 2 nm; coating and impregnation of substances with a low molecular weight into the pores; 2nd steam activation to expand the pore size and micropore volume. The needle coke was characterized by elemental analysis, polarized light microscopy, and thermogravimetric analysis, and the porosity structure was analyzed by the Brunauer-Emmett-Teller (BET) method, the t-plot method, the Barrett-Joyner-Halenda (BJH) method, and the scanning electron microscopy (SEM). The maximum specific surface area and mesopore volume ratio of activated carbon manufactured by two-stage steam activation method was 1134 m2/g and 78%, respectively. The mesopore volume and average pore diameter increased as more coating and impregnation agents were added.
ISSN:0167-577X
1873-4979
DOI:10.1016/j.matlet.2018.09.171