Activated coke is an excellent adsorbent, which can adsorb the SO2 and SO3 from industrial boilers' flue gas emissions at the window temperature (120 ℃ ~ 180 ℃) without heating the flue gas; Meanwhile, activated coke is also a excellent catalyst, it can restore the NOx into N2 and H2O with the conditions of adding the reductant NH3. so the performance of activated coke is the core of flue gas purification effect.