Removal of NO by catalytic decomposition of vaporized H₂O₂ over Mo–Fe/TiO₂ catalyst

Abstract

BACKGROUD A series of Mo–Fe/TiO2 catalysts were employed for the catalytic decomposition of vaporized H2O2 to remove nitric oxide in the low‐temperature range (80–160 °C). The experimental results and the physicochemical properties were evaluated using a variety of techniques. RESULTS The experiment results revealed that the 1.5%Mo–0.5%Fe/TiO2 catalyst exhibited the best catalytic activity and 97.6% NO removal efficiency was obtained at 80 °C. The formation of •OH radicals and oxygen vacancies was verified using electron paramagnetic resonance (EPR). The results of X‐ray photoelectron spectroscopy and EPR proved the importance of oxygen vacancies in the generation of •OH radicals. In addition, the results revealed the great stability of the 1.5%Mo–0.5%Fe/TiO2 catalyst after the introduction of SO2, which proved the sulfur resistance of the catalyst. Finally, the fresh and spent catalysts were characterized using X‐ray diffraction and Fourier transform infrared spectroscopy. The sulfur resistance was also verified using temperature‐programmed desorption of SO2. CONCLUSIONS This study illustrated that Mo–Fe/TiO2 catalysts showed excellent catalytic activity in the low‐temperature range and resistance to SO2. Such catalysts are very promising in the application of flue gas denitrification in industrial furnaces. © 2020 Society of Chemical Industry

Effective nitric oxide removal from flue gas using UV/H2O2 solution catalyzed by Fe3O4@FeEDTA

“…Heterogeneous Fenton-like catalyst, in particular for flue gas treatment, can overcome the shortcomings of the traditional homogeneous Fenton system, such as pH restriction and accumulation of iron sludge. For example, Pu et al 18 employed a series of Mo-Fe/TiO 2 catalysts for the catalytic decomposition of vaporized H 2 O 2 to remove NO in the low-temperature range (80-160 °C). The experiment results revealed that the 1.5% Mo-0.5% Fe/TiO 2 catalyst exhibited the best catalytic activity, and 97.6% NO removal efficiency was obtained at 80 °C.…”

Sustainable Conversion and Cleanup Emission of Ultralow-Concentration Nitric Oxide in Flue Gas by Functionalized Ionic Liquids in the Presence of Water and Air under Elevated Pressure

“…Selective catalytic reduction (SCR), which converts NO into N 2 with ammonia (NH 3 ) and precious metal catalysts at high temperature, represents the most mature technology in industrial denitrification. − Nevertheless, the NO x concentration of post-SCR exhaust gas is struggling to meet increasingly strict regulations on emission of NO x . In addition, manufacturing NH 3 brings large energy consumption, and the conversion of NH 3 and NO to N 2 is not sustainable. , Recently, wet oxidation-absorption technologies have also been used for removing NO, where NO is oxidized by strong oxidants, like O 3 , H 2 O 2 , and Na 2 S 2 O 8 , and removed by basic absorbents. − However, the oxidants and absorbents are not easily available and cannot be regenerated for the following denitrification processes, and the products are often low-value mixtures of nitrates and bases. More importantly, NO is the key intermediate for the synthesis of nitro chemicals, for example, millions of tonnes of HNO 3 are manufactured each year through the energy-demanding Ostwald process .…”