Gasification of carbon/carbon composite prepared from pyrolyzed char of low-grade coke and low-rank coal

Carbon/carbon composites were prepared by pyrolysis of mixtures of coke oven gas tar and low-grade cokes or pyrolyzed chars from lignite and sub-bituminous coals. The indirect tensile strength of each composite prepared reached approximately 7.5 MPa, which is comparable to those of high-grade cokes used in commercial blast furnaces. Although the CO2 gasification rates of the composites prepared from low-grade cokes decreased compared to those of the original samples, those of the composites prepared from pyrolyzed chars were almost the same. From the results of mercury intrusion porosimetry analysis and O-2 adsorption temperature-programmed-desorption tests of samples before and after compositing, it was suggested that the decrease in gasification rates of composites prepared from cokes occurred owing to a decrease in the pores and number of active sites on the original cokes. (C) 2019 Elsevier B.V. All rights reserved.