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

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 degrees 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 degrees C. The formation of (OH)-O-center dot 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)-O-center dot 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. (c) 2020 Society of Chemical Industry

Automated summary

A series of Mo-Fe/TiO2 catalysts were employed for catalytic decomposition of vaporized H2O2 to remove nitric oxide in the low-temperature range (80-160 degrees C). The experiment results showed 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 degrees C. Oxygen vacancies and (OH)-O· radicals were found to play a key role in the catalytic process. The catalyst also demonstrated great stability and sulfur resistance, making it a promising option for industrial flue gas denitrification.