Removal of NO from Flue Gas by a Heterogeneous Fenton‐Like Process

An iron‐containing polyoxometalates (POMs) complex (Fe III AspPW) was synthesized from ferric chloride, aspartic acid, and phosphotungstic acid for developing a novel method based on a Fenton‐like process using Fe‐containing POMs as heterogeneous catalyst to remove NO from flue gas. The effects of various experimental parameters on NO removal efficiency were evaluated in a self‐made bubbling reactor. Under optimized conditions, an average removal efficiency of > 90 % was obtained. The dominant reactive species generated in the system was suggested to be • OH by adding the • OH quenching agent of tert ‐butanol and the main reaction product was identified as nitrate. A possible catalytic mechanism was proposed on the basis of experimental results and references. The catalysis might result from the redox cycles of ≡Fe III ↔≡Fe II and ≡POM↔≡POM − on the surface of Fe III AspPW, and the high catalytic activity of Fe III AspPW might be attributed to the chemisorption of H 2 O 2 on its surface by hydrogen bonding.