ISSN print edition: 0366-6352 ISSN electronic edition: 1336-9075 Registr. No.: MK SR 9/7 Published monthly

Properties of Sorbents from Brown Coal

P. Straka and J. Buchtele

Institute of Rock Structure and Mechanics, Academy of Sciences of the Czech Republic, CZ-182 09 Prague

Abstract: The surface and sorptional properties of carbonaceous materials prepared from brown coal and their relation to minerals content and coal bulk density as technologically important parameters of starting coal were described.From brown coal of North Bohemian Brown Coal District the chars were prepared and activated with CO₂ in a large-scale laboratory unit. Their surface and sorptional properties were investigated. It was found that mineral matters/ash content favourably affects the mesoporosity development in chars/activated chars as the sorption capacity increased with increasing ash contest in chars. No influence of ash content on the macroporosity was observed. With the activated chars, both the inner surface and sorption capacity showed the maximum in the burn-off range of 41-64 %. In this connection, optimization of the process is discussed. The mass balance of carbonization and size analysis of chars and activated chars were carried out and the influence of ash content and coal bulk density was discussed.

Full paper in Portable Document Format: 543a148.pdf

Chemical Papers 54 (3) 148–154 (2000)