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A system for NO removal from flue gas comprising partial oxidation by H 2 O 2 and selective catalytic reduction (SCR) process is proposed in this study. This hybrid system is found to be extremely efficient for deNO x at 200−290 °C. In this system, H 2 O 2 partially oxidizes the NO molecules to NO 2 . The NO/NO 2 mixture reacts fast with NH 3 on the surface of a V 2 O 5 −WO 3 /TiO 2 catalyst. The reaction kinetics was studied by varying reaction temperatures and the H 2 O 2 /NO molar ratio. A V 2 O 5 −WO 3 /TiO 2 SCR catalyst was also filled in the oxidation reactor, but it hardly changes the oxidation rate. The downstream SCR reaction was found to be significantly upgraded by the preoxidation process, which elevates the NO x reduction rate from 20% (without preoxidation) to more than 60% (with preoxidation).

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