Title

MICROSTRUCTURE AND CO2 REACTIVITY OF CHARCOAL IMPREGNATED BY COAL TAR

MICROSTRUCTURE AND CO2 REACTIVITY OF CHARCOAL IMPREGNATED BY COAL TAR

Authorship

Fraga, Matheus Teixeira; Flores, Bruno Deves; Gums, Alessandro; Flores, Ismael Vendrame; Osório, Eduardo; Vilela, Antônio Cezar Faria

Fraga, Matheus Teixeira

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Flores, Bruno Deves

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Gums, Alessandro

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Flores, Ismael Vendrame

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Osório, Eduardo

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Vilela, Antônio Cezar Faria

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DOI

10.5151/5463-5463-35081

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Abstract

The use of charcoal in the production of coke is one of the alternatives to mitigate CO2 emissions in the steel industry. However, the addition of charcoal in cokemaking has severe limitations, which are mainly associated with its high reactivity to CO2. In previous works, the impregnation of charcoal by tar proved to be a promising mechanism in the attempt to insert this material. This work aimed at incresing the knowledge about the technique of impregnation of tar on the charcoal evaluating its efficiency and influence on the reactivity to CO2. For this purpose, the morphology of charcoal particles impregnated with tar was investigated by microscopy while the reactivity of this material was analyzed through thermogravimetric tests. As a result, impregnation directly reflects a decrease in the surface area of the charcoal particle and, consequently, a decrease in CO2 reactivity of the impregnated charcoal. This behavior was mainly attributed to the decrease in surface area caused by the impregnation and the intrinsic behavior of low reactivity of the pyrolyzed tar, thus forming an effective barrier against the gasification of the material.

The use of charcoal in the production of coke is one of the alternatives to mitigate CO2 emissions in the steel industry. However, the addition of charcoal in cokemaking has severe limitations, which are mainly associated with its high reactivity to CO2. In previous works, the impregnation of charcoal by tar proved to be a promising mechanism in the attempt to insert this material. This work aimed at incresing the knowledge about the technique of impregnation of tar on the charcoal evaluating its efficiency and influence on the reactivity to CO2. For this purpose, the morphology of charcoal particles impregnated with tar was investigated by microscopy while the reactivity of this material was analyzed through thermogravimetric tests. As a result, impregnation directly reflects a decrease in the surface area of the charcoal particle and, consequently, a decrease in CO2 reactivity of the impregnated charcoal. This behavior was mainly attributed to the decrease in surface area caused by the impregnation and the intrinsic behavior of low reactivity of the pyrolyzed tar, thus forming an effective barrier against the gasification of the material.

Keywords

Charcoal; Coal tar; Reactivity

Charcoal; Coal tar; Reactivity