Extraction of hydrogen from fossil fuels with production ...
May 01, 2008 · Coal heated to 900–1300 °C in the absence of oxygen gives off coke oven gas (about 55 vol% hydrogen and 25 vol% methane), condensable residues and pitch (coal tar pitch), and leaves coke . Coke is a strong, hard solid. The density of coke is quite low, because it has spongy texture with pores, voids, and fissures.