Study of heat-treated Spanish lignites: characteristics and behaviour in CO2 and O2 gasification reactions

摘要: Abstract Six Spanish lignites (raw and demineralized) have been charred to 1113 K in a N 2 atmosphere. The surface area, porosity mineral matter content of the char coals so obtained studied, as well their reactivity CO flow range 1073–1113 K, dry air temperature 733–773 K. reactivities raw chars may be explained according different inorganic that act catalyst. demineralization process brings about lowering an increase, general, apparent activation energy interpreted being due fall and/or increase amount feeder pores. With regard energy, case three groups established. differences between these impurities present catalyse reaction carbon with O more than porous texture parameters. Demineralization values levelling off energies. catalytic effect iron has also studied by adding amounts this metal demineralized char. burn-off versus time curves adjusted using τ 0.5 parameter.