Simultaneous removal of SO2 and NO from flue gas with OH from the catalytic decomposition of gas-phase H2O2 over solid-phase Fe2(SO4)3

Removal of NOX Using Hydrogen Peroxide Vapor over Fe/TiO2 Catalysts and an Absorption Technique

“…This phenomenon could be interpreted such that the surface nitrate would decompose into NO2 on the TiO2 surface when the catalyst dosage was excessive [22]. In the meanwhile, the Ti 3+ species generated in the redox process might have reacted with NO2 (Equation (7)), thus facilitating the generation of NO [10,23]. …”

“…Recently, Zhao et al adopted nanoscale zerovalent iron to activate vaporized H 2 O 2 for removing NO, and the NO removal efficiency was 80.4% at the price of a low H 2 O 2 dosage (H 2 O 2 /NO molar ratio = 10~30:1) [9]. Moreover, Wu further decreased the H 2 O 2 /NO molar ratio to 4~16:1 by employing the solid-phase Fe 2 (SO 4 ) 3 and La 1−x Ca x FeO 3 oxides as the catalysts [10,11]. However, they focused more attention on the removal efficiency of NO, irrespective of the potential intermediates and their individual hazards.…”

Efficient and stable catalyst of α-FeOOH for NO oxidation from coke oven flue gas by the catalytic decomposition of gaseous H2O2

“…This method can achieve the simultaneous removal of SO 2 and NO x using the oxidisers. Some oxidisers, such as O 3 , 6,7 H 2 O 2 , [8][9][10][11][12] NaClO 2 , 13 NaClO, 14 persulphate salt (S 2 O 8 2À ) 15 and ferrate (Fe[VI]), 16 can be used as the gasphase oxidiser for NO oxidation aer being gasied if needed. H 2 O 2 is a green and low-cost oxidizer, which can be used as the gas-phase oxidizer for NO oxidation aer liquid H 2 O 2 is gasied at low temperature.…”

“…Furthermore, the oxidation potential of H 2 O 2 (1.77 eV) is lower compared with that of O 3 (2.08 eV) and $OH (2.80 eV) and thus its efficiency in oxidising NO is low. 12,17 19 and Fe 2 (SO 4 ) 3 , 12 have been used as catalysts to decompose gaseous H 2 O 2 for NO oxidation. These catalysts have high removal efficiencies as heterogeneous catalysts for the simultaneous removal of NO and SO 2 in an integrated catalytic oxidation/wet scrubbing process.…”

“…These catalysts have high removal efficiencies as heterogeneous catalysts for the simultaneous removal of NO and SO 2 in an integrated catalytic oxidation/wet scrubbing process. However, the use of these catalysts results in relatively high H 2 O 2 consumption 8,9,12,20 and relatively low gas hourly space velocity (GHSV) 19 and catalytic stability. 9,12 Therefore, a catalyst with low H 2 O 2 consumption and high GHSV and catalytic stability for NO oxidation through catalytic decomposition of gaseous H 2 O 2 should be developed.…”