Chemical-looping combustion (CLC) is a novel technology that can be used to meet demands on energy production without CO(2) emissions. The CLC-process includes two reactors, an air and a fuel reactor. Between these two reactors oxygen is transported by an oxygen carrier, which most often is a metal oxide. This arrangement prevents mixing of N(2) from the air with CO(2) from the combustion. The combustion gases consist almost entirely Of CO(2) and H(2)O. Therefore, the technique reduces the energy penalty that normally arises from the separation Of CO(2) from other flue gases, hence, CLC may make capture of CO(2) cheaper. Iron ore and oxide scale from steel production were tested as oxygen carriers in CLC batch experiments with solid fuels. Petroleum coke, charcoal, lignite and two bituminous coals were used as fuels. The experiments were carried out in a laboratory fluidized-bed reactor that was operating cyclically with alternating oxidation and reduction phases. The exhaust gases were led to an analyzer where the contents Of CO(2), CO, CH(4) and O(2) were measured. Gas samples collected in bags were used to analyze the content of hydrogen in a gas chromatograph. The results showed that both the iron ore and the oxide scale worked well as oxygen carrier and both oxygen carriers increased their reactivity with time. (c) 2009 Elsevier Ltd. All rights reserved.