Abstract: In order to control the formation and emission of chromium generated from coal combustion，combustion tests
were carried out on Zhundong coal with different adsorbents. The effects of four different sorbents（CaO，Al2O3，Fe2O3，
kaolin）on the retention of chromium in ash were investigated through experiments，and the thermodynamic calculation was
conducted to reveal the influence of sorbents on Cr retention，leaching and thermodynamic equilibrium transformation. The
results show that adsorbent CaO or Fe2O3 reacts with chromium compounds to generate chromate，showing a favorable Cr
retention rate which can exceed 80%，while the Cr retention rate with adsorbent Al2O3 or kaolin is quite low. The leaching
rate of Cr in burning ash is the lowest with adsorbent Fe2O3. The Cr in the ash generated from Oxy-fuel combustion can be
better leached，compared to that generated from Air combustion，and the leaching rate of Cr in fine ash is higher than that
in coarse ash.From the perspectives of Cr capture efficiency and low leaching rate, Fe2O3 is the most effective chromium
adsorbent.

Key words: Zhundong coal, chromium, sorbent, retention rate, migration and transformation of Cr