A novel low‐temperature NO removal approach with •OH from catalytic decomposition of H₂O₂ over La_1‐xCa_xFeO₃ oxides

Abstract

BACKGROUND: In industrial boilers, the flue gas temperature was below 200 ∘ C. The activated temperatures of conventional NO removal approach such as SCR was over 300 ∘ C, limiting its application in industrial boilers. In this study, a novel low-temperature NO removal approach with hydroxyl radicals (•OH) from catalytic decomposition of H 2 O 2 over La 1-x Ca x FeO 3 oxides (x = 0, 0.1, 0.3 and 0.5) was proposed. With respect to four as-prepared catalysts, the catalytic performance was presented and the mechanism was proposed.

Study on the Macro‐Kinetics of NO Advanced Oxidation Removal by Decomposition of Gas‐Phase H2O2 over γ‐Fe2O3@Fe3O4

“…Table quantified the relative abundance of Fe (II) and Fe (III) in the magnetite and maghemite spectra. From Figure , the O1s spectrum could be divided into three peaks, which were lattice oxygen (Olat=529.6∼530.4 eV), adsorbed oxygen associated with hydroxyl or carbonate (Oad=531.2∼532.2 eV), and adsorbed molecular water (H 2 O∼532.2 eV) . The Table exhibited the concentration of Oad/(Oad + Olat) in different catalysts.…”

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

“…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.…”

Scale-up experiments of SO2 removal and the promoting behavior of NO in moving beds at medium temperatures

“…[4][5][6][7][8][9][10] Limestone-based wet ue gas desulfurization (Ca-WFGD) and ammonia-based selective catalytic reduction (NH 3 -SCR) denitrication are simultaneously used in the pollutant control system in power plants. [10][11][12] However, huge investment and operating costs, complicated system and secondary pollution have attracted considerable attention. 13,14 Dry simultaneous control technologies are promisingly investigated without large water assumptions and low secondary pollution.…”