Preparation of activated carbons from bituminous coals with CO{sub 2} activation. 1: Effects of oxygen content in raw coals

Journal Article · Fri Nov 01 04:00:00 EST 1996 · Industrial and Engineering Chemistry Research

DOI:https://doi.org/10.1021/ie960170d· OSTI ID:404558

Teng, H; Ho, J A; Hsu, Y F; Hsieh, C T ^[1]

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1. Chung Yuan Christian Univ., Chung-Li (Taiwan, Province of China). Dept. of Chemical Engineering

Activated carbons were prepared from three Australian bituminous coals in this study. The preparation process consisted of carbonization followed by activation in CO{sub 2}. Experimental results reveal that the oxygen content of the coals has a great influence on the behavior during preparation and on the properties of the products. The coal with a higher O/C atomic ratio has a lower peak temperature for volatile evolution during carbonization and is able to produce a char with a higher surface area. The reactivity in CO{sub 2}, the surface area, and the pore volume of the resulting activated carbon are all increasing functions of the O/C ratio of the coal precursors. An SEM study shows that at high burn-off levels a higher portion of gasification occurs at the exterior surface of the carbon from the coal with a lower O/C ratio, indicating that the diffusion resistance may be stronger for this carbon. For the same coal precursor, the average pore diameter of the activated carbon increases as the temperature for activation is increased in the range of 800--900 C.

• OSTI ID: 404558
• Journal Information: Industrial and Engineering Chemistry Research, Journal Name: Industrial and Engineering Chemistry Research Journal Issue: 11 Vol. 35; ISSN IECRED; ISSN 0888-5885
• Country of Publication: United States
• Language: English

Related Subjects

01 COAL, LIGNITE, AND PEAT
ACTIVATED CARBON
BITUMINOUS COAL
CARBONIZATION
CHEMICAL ACTIVATION
CHEMICAL COMPOSITION
CHEMICAL PREPARATION
PRECURSOR